This post has been edited by vick5821: Nov 10 2008, 03:48 PM
SPM Thread 08/09 (V 3), SPM is coming soon..!!!! Final days..!!
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  Oct 26 2008, 05:26 PM, updated 18y ago
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#1
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3,871 posts Joined: May 2008  
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continue here..wow..not yet til 09 already V 3 d
This post has been edited by vick5821: Nov 10 2008, 03:48 PM |
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Oct 26 2008, 05:34 PM
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#2
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503 posts Joined: Sep 2006 From: Land below the wind 
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huhu..presure pressure @_@ but cant wait the life after spm
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Oct 26 2008, 05:36 PM
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#3
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4,503 posts Joined: Jun 2008 From: The Far Away Venus Status: Being Insua-fied 
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QUOTE(vick5821 @ Oct 26 2008, 05:26 PM) continue here..wow..not yet til 09 already V 3 d that means either 1. This year spm candidates have a lot of discussions or 2. This year spm candidates are big spammers  |
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Oct 26 2008, 05:50 PM
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#4
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no..i think i have too many ques d..haha
p/s anyone have any useful notes ? or mayb you dun use it after SPM d kindly PM me.. This post has been edited by vick5821: Oct 26 2008, 05:51 PM |
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Oct 26 2008, 05:55 PM
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#5
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QUOTE(solstice818 @ Oct 26 2008, 05:36 PM) that means either woot! V3!...1. This year spm candidates have a lot of discussions or 2. This year spm candidates are big spammers QFT  |
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Oct 26 2008, 06:05 PM
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#6
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1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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SPM just around corner but i have no mood to study now..
Damn sienz... |
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Oct 26 2008, 06:06 PM
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#7
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2,950 posts Joined: Aug 2008
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study la...even now i force myself to do so...lolz..
actually works btw... |
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Oct 26 2008, 06:09 PM
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#8
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302 posts Joined: May 2006
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i wan to finish spm.but i dun wan to leave school.. xD
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Oct 26 2008, 06:10 PM
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#9
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4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(-PatheticSoul- @ Oct 26 2008, 06:09 PM) i wan to finish spm.but i dun wan to leave school.. xD sure you can do that. Just stay at school after SPM. |
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Oct 26 2008, 06:50 PM
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46 posts Joined: Jan 2008
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Siannn . ;x SPM Arrrr . I wan fast fast over . But dowan fast fast come ;D
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Oct 26 2008, 06:57 PM
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Senior Member
1,606 posts Joined: Oct 2007 From: Emirates Stadium ~
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QUOTE(silverchain @ Oct 26 2008, 05:34 PM) huhu..presure pressure @_@ but cant wait the life after spm same same  |
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Oct 26 2008, 07:55 PM
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823 posts Joined: Apr 2005
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QUOTE(billygoh @ Oct 26 2008, 06:57 PM) same same Me three Just wanna get it over with  Bring it on!!  |
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Oct 26 2008, 07:57 PM
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3,871 posts Joined: May 2008
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study then..study already= no pressure..
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Oct 26 2008, 08:02 PM
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Senior Member
855 posts Joined: Oct 2008 From: Timezone , WA 
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seriously la those who study very hard should relax abit or eles when you enter the hall , totaly panic than the brain cant think , like that die lo !
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Oct 26 2008, 08:31 PM
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2,550 posts Joined: Dec 2006
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Like what we doing here consider RELAX?haha!!
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Oct 26 2008, 08:42 PM
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which of the following solutions has the highest concentration of hydroxide ion?
A. 50 cm3 of 2 mol dm-3 aqueous ammonia B. 50 cm3 of 1 mol dm-3 potassium hydroxide C. 20cm3 of 2 mol dm-3 sodium hydroxide D. 50cm3 of 5 mol dm-3 zinc hydroxide. how to see wor.? |
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Oct 26 2008, 08:50 PM
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671 posts Joined: May 2006
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Either C or D.
I think it's C |
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Oct 26 2008, 09:01 PM
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36 posts Joined: May 2008 From: selangor
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hey gud luck to u guys,this year's spm candidates..glad mine was over 2 years back..hehe..
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Oct 26 2008, 09:09 PM
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46 posts Joined: Jan 2008
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It should be C .
The higher the volume the lower the concentration . This post has been edited by Mu619: Oct 26 2008, 09:13 PM |
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Oct 26 2008, 09:14 PM
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3,871 posts Joined: May 2008
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haha..wrong..it's D
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Oct 26 2008, 09:20 PM
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402 posts Joined: Sep 2008 From: Kancolle!
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QUOTE(vick5821 @ Oct 26 2008, 08:42 PM) which of the following solutions has the highest concentration of hydroxide ion? Rule A and B out.A. 50 cm3 of 2 mol dm-3 aqueous ammonia B. 50 cm3 of 1 mol dm-3 potassium hydroxide C. 20cm3 of 2 mol dm-3 sodium hydroxide D. 50cm3 of 5 mol dm-3 zinc hydroxide. how to see wor.? C and D seems to have the same concentration, but look at the chemical formula for both chemicals. C is NaOH but D is Zn(OH)2 D will have double the amount of hydroxide ions, so D is the answer. |
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Oct 26 2008, 09:22 PM
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3,871 posts Joined: May 2008
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why A and B out?
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Oct 26 2008, 09:29 PM
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402 posts Joined: Sep 2008 From: Kancolle!
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QUOTE(vick5821 @ Oct 26 2008, 09:22 PM) why A and B out? Look at the proportions of volume against concentration.The higher the volume, the lower the concentration of the chemical. 50cm3 of 2 mol dm-3 NH4OH becomes 25cm3 of 1 mol dm-3. So...to simplify the details... A. 25cm3 , 1 mol dm-3 B. 50cm3 , 1 mol dm-3 C. 10cm3 , 1 mol dm-3 D. 10cm3 , 1 mol dm-3 And we choose D as the concentration is double. [Due to (OH)2.] Edit: Whoops, don't follow the above concept. Use mv/1000. This post has been edited by fhNicK: Oct 26 2008, 11:14 PM |
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Oct 26 2008, 09:31 PM
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oh..understood
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Oct 26 2008, 10:35 PM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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eh u sure not using mv/1000?
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Oct 26 2008, 10:57 PM
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1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 26 2008, 08:42 PM) which of the following solutions has the highest concentration of hydroxide ion? D,i guess....mv/1000A. 50 cm3 of 2 mol dm-3 aqueous ammonia B. 50 cm3 of 1 mol dm-3 potassium hydroxide C. 20cm3 of 2 mol dm-3 sodium hydroxide D. 50cm3 of 5 mol dm-3 zinc hydroxide. how to see wor.? |
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Oct 26 2008, 11:10 PM
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95 posts Joined: Oct 2008
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hello
 i disagree on the higher the volume the lower the concentration i dont think that is true the volume may decrease or increase but if the molarity(mol dm-3) is the same the concentration remains the same what matters is the mole no. concentration only decreases if you add distilled water This post has been edited by Jojos: Oct 26 2008, 11:11 PM |
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Oct 26 2008, 11:16 PM
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402 posts Joined: Sep 2008 From: Kancolle!
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QUOTE(Jojos @ Oct 26 2008, 11:10 PM) hello Sorry for the wrong concept. Can't really remember what I learnt a year ago. i disagree on the higher the volume the lower the concentration i dont think that is true the volume may decrease or increase but if the molarity(mol dm-3) is the same the concentration remains the same what matters is the mole no. concentration only decreases if you add distilled water  Anyway, follow the explanation stated above and use mv/1000 to find the answer. Thanks for clarifying and sorry if I caused any confusion.  |
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Oct 27 2008, 12:19 AM
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41 posts Joined: Sep 2008 From: Land of Hornbill
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QUOTE(-PatheticSoul- @ Oct 26 2008, 06:09 PM) i wan to finish spm.but i dun wan to leave school.. xD then become temporary teacher or apply for maktab or choose education course in uni after this .. u will not leave the school..LOL QUOTE(fhNicK @ Oct 26 2008, 09:29 PM) Look at the proportions of volume against concentration. which of the following solutions has the highest concentration of hydroxide ion?The higher the volume, the lower the concentration of the chemical. 50cm3 of 2 mol dm-3 NH4OH becomes 25cm3 of 1 mol dm-3. So...to simplify the details... A. 25cm3 , 1 mol dm-3 B. 50cm3 , 1 mol dm-3 C. 10cm3 , 1 mol dm-3 D. 10cm3 , 1 mol dm-3 And we choose D as the concentration is double. [Due to (OH)2.] Edit: Whoops, don't follow the above concept. Use mv/1000. A. 50 cm3 of 2 mol dm-3 aqueous ammonia B. 50 cm3 of 1 mol dm-3 potassium hydroxide C. 20cm3 of 2 mol dm-3 sodium hydroxide D. 50cm3 of 5 mol dm-3 zinc hydroxide. yea...just use MV/1000 to find the mol, then u will know.. always think to find the mol if u r given concentration and volume then, u will be able to determine which one has the highest concentration of OH- A. 0.1 B. 0.05 C. 0.04 D. 0.25 [multiply 2 to the mol u find(0.25 beacuse it is Zn(OH)2 ] Added on October 27, 2008, 12:23 am QUOTE(vick5821 @ Oct 26 2008, 05:26 PM) continue here..wow..not yet til 09 already V 3 d geng, V3.. study smart yeabest of luck to all the SPM students here..  This post has been edited by nicoleycc: Oct 27 2008, 02:35 AM |
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Oct 27 2008, 01:36 AM
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186 posts Joined: Sep 2006 From: Selangor
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QUOTE(nicoleycc @ Oct 27 2008, 12:19 AM) then become temporary teacher or apply for maktab or choose education course in uni after this .. Erm.. are you sure the decimal is that much? I only get numbers like 2 decimal places.. u will not leave the school..LOL which of the following solutions has the highest concentration of hydroxide ion? A. 50 cm3 of 2 mol dm-3 aqueous ammonia B. 50 cm3 of 1 mol dm-3 potassium hydroxide C. 20cm3 of 2 mol dm-3 sodium hydroxide D. 50cm3 of 5 mol dm-3 zinc hydroxide. yea...just use MV/1000 to find the mol, then u will know.. always think to find the mol if u r given concentration and volume then, u will be able to determine which one has the highest concentration of OH- A. 1x 10-4 B. 5x 10 -5 C. 4x 10-5 D. 5x 10-3 [multiply 2 to the mol u find(2.5x10-3 beacuse it is Zn(OH)2 ] Added on October 27, 2008, 12:23 am geng, V3.. study smart yea best of luck to all the SPM students here.. |
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Oct 27 2008, 01:41 AM
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452 posts Joined: Oct 2008 From: ChocoLand
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Her working is wrong.
I think she converted the volume's unit to dm3 yet still using mv/1000. The reason mole = mv/1000 is because usually the volume of chemical used is in cm3 which will be needed to be converted into dm3 whereas molarity is moldm-3. So mv/1000 is actually m x v/1000 |
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Oct 27 2008, 02:40 AM
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Junior Member
41 posts Joined: Sep 2008 From: Land of Hornbill
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QUOTE(goldmahkot @ Oct 27 2008, 01:36 AM) Erm.. are you sure the decimal is that much? I only get numbers like 2 decimal places.. sorry.. i made a BIG mistake..  QUOTE(HotChocolate @ Oct 27 2008, 01:41 AM) Her working is wrong. thanks for the correction I think she converted the volume's unit to dm3 yet still using mv/1000. The reason mole = mv/1000 is because usually the volume of chemical used is in cm3 which will be needed to be converted into dm3 whereas molarity is moldm-3. So mv/1000 is actually m x v/1000 yea, the reason of mole MV/1000 is to change the given volume with cm3 to dm3 To find the number of moles of a solute is solution is n=MV where M is molarity (mol dm-3) V is volume of solution in dm3 This post has been edited by nicoleycc: Oct 27 2008, 02:44 AM |
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Oct 27 2008, 04:16 AM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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lolz u all spm students ? or got form 4s .
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Oct 27 2008, 07:07 AM
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1,360 posts Joined: Aug 2008
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Let say that you are given an essay title "Acid rain". It is an open essay. (English 119C)
So, can I write about the formation of acid rain, with all the scientific term inside? And another essay is describe a famous scientist and his contribution to the world. Do the examiner concentrate on the background of all the scientists? Or just their contribution will do? This post has been edited by macamtakada: Oct 27 2008, 07:08 AM |
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Oct 27 2008, 07:57 AM
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46 posts Joined: Jan 2008
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Oh nooo . The answer is D ? ;x
My chemistry is not that good after all and SPM is so near ;x |
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Oct 27 2008, 08:30 AM
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3,871 posts Joined: May 2008
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An aqueous solution of Q has a pH value of 1. Q may be
I 0.1 mol dm-3 hydrochloric acid II 0.001 mol dm-3 sulphuric acid III 0.1 mol dm-3 nitric acid Iv 0.1 mol dm-3 ethanoic acid.. A. I and III B. II and Iv C. I,II and III D. I, III and Iv how how how? This post has been edited by vick5821: Oct 27 2008, 08:35 AM |
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Oct 27 2008, 08:33 AM
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671 posts Joined: May 2006
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it's not IV for sure... and I is a must.
What's the options for the answer? |
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Oct 27 2008, 08:43 AM
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823 posts Joined: Apr 2005
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QUOTE(vick5821 @ Oct 27 2008, 08:30 AM) An aqueous solution of Q has a pH value of 1. Q may be Like KingKong said.. IV should definitely be out since Carboxylic Acids are weak acids..I 0.1 mol dm-3 hydrochloric acid II 0.001 mol dm-3 sulphuric acid III 0.1 mol dm-3 nitric acid Iv 0.1 mol dm-3 ethanoic acid.. A. I and III B. II and Iv C. I,II and III D. I, III and Iv how how how? I and II should be in.. and since there's no answer for just I and II then I guess it's C?  |
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Oct 27 2008, 08:47 AM
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3,871 posts Joined: May 2008
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ans is not that..
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Oct 27 2008, 08:56 AM
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4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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I think A gua
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Oct 27 2008, 08:58 AM
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3,871 posts Joined: May 2008
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ya..it's A
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Oct 27 2008, 09:03 AM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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pH 1 is the measurement for strong acid.
For SPM, 0.1moldm^-3 is considered as strong acid D could be right, but it is ethanoic acid (a week acid), even though its molarity is 0.1moldm^-3, its pH still higher than 1. This post has been edited by work_tgr: Oct 27 2008, 09:04 AM |
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Oct 27 2008, 09:06 AM
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3,871 posts Joined: May 2008
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So, in SPM SYLLABUS, WEAK ACID impossible to have pH value less than 2?
This post has been edited by vick5821: Oct 27 2008, 09:07 AM |
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Oct 27 2008, 09:10 AM
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4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Oct 27 2008, 09:06 AM) So, in SPM SYLLABUS, WEAK ACID impossible to have pH value less than 2? Not necessary. There is no obvious statement to tell SPM students about what exactly makes the value of pH. Of course, it must be related with the content of OH- and H+. So, week acid such as ethanoic acid of 0.1moldm^-3 could be higher than 1 because it doesn't dissociate completely. But, if the molarity increase to 1moldm^-3 or higher, it could be pH1. This post has been edited by work_tgr: Oct 27 2008, 09:12 AM |
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Oct 27 2008, 09:12 AM
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3,871 posts Joined: May 2008
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so if weak acid is concentrated, the ph value could be less than 1 la? how abt dilute sulphuric acid..ph 2?
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Oct 27 2008, 09:16 AM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Oct 27 2008, 09:12 AM) so if weak acid is concentrated, the ph value could be less than 1 la? yes, pH 1. But less than 1 ?  QUOTE(vick5821 @ Oct 27 2008, 09:12 AM) how abt dilute sulphuric acid..ph 2? It's based on experiment and we can not tell by the concentration to get the exact value of pH. But, we can make a rough guess. pH2 is still under the group of concentrate acid.This post has been edited by work_tgr: Oct 27 2008, 09:16 AM |
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Oct 27 2008, 09:21 AM
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3,871 posts Joined: May 2008
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oh..so a ques here
when 0.1 mol dm-3 solution L is tested wiuth pH paper, the colour change shows that solution L has a pH of 3.Which of the following is possibly solution L? A. WEAK ETHANOIC ACID B. DILUTE SULPHURIC ACID C. AMMONIA AQUEOUS SOLUTION D. SODIUM HYDROXIDE SOLUTION. i know C and D is out already.. |
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Oct 27 2008, 09:27 AM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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yes, C&D are alkali and B is better answer than A because pH of WEAK ETHANOIC ACID around 5 or 6.
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Oct 27 2008, 09:29 AM
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3,871 posts Joined: May 2008
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QUOTE(work_tgr @ Oct 27 2008, 09:27 AM) yes, C&D are alkali and B is better answer than A because pH of WEAK ETHANOIC ACID around 5 or 6. if strong ethanoic acid? btw..the book ans is A leh |
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Oct 27 2008, 09:41 AM
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Senior Member
671 posts Joined: May 2006
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Got any tips for physics? That's my weakest subject besides addmath of course. The only chapter in physics that I understand is Radioactivity. The rest go kelaut already.
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Oct 27 2008, 10:49 AM
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2,950 posts Joined: Aug 2008
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QUOTE(Leto Kynes @ Oct 27 2008, 08:43 AM) Like KingKong said.. IV should definitely be out since Carboxylic Acids are weak acids.. answer is CI and II should be in.. and since there's no answer for just I and II then I guess it's C? QUOTE(vick5821 @ Oct 27 2008, 09:21 AM) oh..so a ques here Mostly is B...why A?..if its weak CH3COOH then the pH value is around 4.5~5.5...why 3?when 0.1 mol dm-3 solution L is tested with pH paper, the colour change shows that solution L has a pH of 3.Which of the following is possibly solution L? A. WEAK ETHANOIC ACID B. DILUTE SULPHURIC ACID C. AMMONIA AQUEOUS SOLUTION D. SODIUM HYDROXIDE SOLUTION. i know C and D is out already.. |
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Oct 27 2008, 10:56 AM
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1,360 posts Joined: Aug 2008
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 Added on October 27, 2008, 11:00 am QUOTE(vick5821 @ Oct 27 2008, 09:29 AM) if strong ethanoic acid? btw..the book ans is A leh Maybe because pH value of sulphuric acid is 2. SO, the pH value of dilute sulphuric acid > 2.pH value of ethanoic acid is 3. So, pH value of weak ethanoic acid > 3. C and D is out. SO the best answer is A : Sulphuric acid. pH value is Reference from revision book. This post has been edited by macamtakada: Oct 27 2008, 11:07 AM |
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Oct 27 2008, 12:12 PM
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Junior Member
186 posts Joined: Sep 2006 From: Selangor
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Vick, that question is from what book? Some workbooks are not good, the questions they give are ridiculous with wrong answers, I had such a book once.
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Oct 27 2008, 12:16 PM
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Senior Member
3,871 posts Joined: May 2008
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from longman.
Added on October 27, 2008, 1:34 pm QUOTE(work_tgr @ Oct 27 2008, 09:10 AM) Not necessary. tis correct? but other ppl told me that no worThere is no obvious statement to tell SPM students about what exactly makes the value of pH. Of course, it must be related with the content of OH- and H+. So, week acid such as ethanoic acid of 0.1moldm^-3 could be higher than 1 because it doesn't dissociate completely. But, if the molarity increase to 1moldm^-3 or higher, it could be pH1. This post has been edited by vick5821: Oct 27 2008, 01:34 PM |
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Oct 27 2008, 02:36 PM
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Senior Member
765 posts Joined: May 2008
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Guys, since there's so many experiments in Bio,Chem and Physics. How do you guys memorize all of them since the questions in SPM experiments will be randomly out.
This post has been edited by ilovecookies92: Oct 27 2008, 03:26 PM |
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Oct 27 2008, 03:15 PM
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1,179 posts Joined: Jul 2005 From: SS2, Petaling Jaya, Selangor
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QUOTE(ilovecookies92 @ Oct 27 2008, 02:36 PM) Guys, since there's so many pekas in Bio,Chem and Physics. How do you guys memorize all of them since the questions in SPM Peka will be randomly out. Only Peka? Isn't it all experiments? |
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Oct 27 2008, 03:25 PM
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Senior Member
765 posts Joined: May 2008
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QUOTE(PetroToxin @ Oct 27 2008, 03:15 PM) Only Peka? Isn't it all experiments? Oops. Sorry. Experiments. *Edited* |
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Oct 27 2008, 03:27 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(macamtakada @ Oct 27 2008, 10:56 AM) » Click to show Spoiler - click again to hide... « 2) 2 tan2x = square root x tan2x = (square root x)/2 2x = 40.8934, 220.8934 x = 20.4467, 110.4467 3) Translate them into a diagram. Hope you'll understand. [attachmentid=646442] a)sin (P+Q) =sin P cos Q + cos P sin Q =3/5(-12/13) + 4/5(-5/13) =-56/65 b)tan (P-Q) =(tan P - tan Q) / (1 + tan P tan Q) =(4/3 - 12/5) / [1 + (4/3)(-12/-5)] =-16/63 4)Where are the symbols? |
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Oct 27 2008, 03:39 PM
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Junior Member
46 posts Joined: Jan 2008
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Hey , I came across this question . It's something similar with the question about the concentration of hydrogen ions .
Which of the following has the highest concentration of hydrogen ion ? A . 20cm3 of 0.5mol dm-3 ethanoic acid B . 10cm3 of 1.0mol dm-3 sulphuric acid C . 5cm3 of 2.0 moldm-3 hydrochloric acid D . 1cm3 of 10.0mol dm-3 methanoic acid How to do ? |
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Oct 27 2008, 03:53 PM
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Senior Member
1,179 posts Joined: Jul 2005 From: SS2, Petaling Jaya, Selangor
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QUOTE(Mu619 @ Oct 27 2008, 03:39 PM) Hey , I came across this question . It's something similar with the question about the concentration of hydrogen ions . From the looks of it, I will pick B.Which of the following has the highest concentration of hydrogen ion ? A . 20cm3 of 0.5mol dm-3 ethanoic acid B . 10cm3 of 1.0mol dm-3 sulphuric acid C . 5cm3 of 2.0 moldm-3 hydrochloric acid D . 1cm3 of 10.0mol dm-3 methanoic acid How to do ? A and D is out because they are weak acids that only dissociate partially. Both B and C has the same number of moles, but B is a diprotic acid, which means it has two hydrogen atoms. |
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Oct 27 2008, 03:54 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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D.I.Y but I'll teach the concept.
1)Find the number of mole of the acid by using mv/1000. 2)Find the number of H+ ion by using (the number of hydrogen atom in the acid x number of mole of acid). 3)The highest number of hydrogen ion is the highest concentration. P/s: Number of hydrogen atom in the acid can be obtained in their formula. Eg: H2SO4 has 2 hydrogen atoms. |
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Oct 27 2008, 04:01 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..i know to do tis type of question d..so every ques just follow the steps?
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Oct 27 2008, 04:02 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(ilovecookies92 @ Oct 27 2008, 02:36 PM) Guys, since there's so many experiments in Bio,Chem and Physics. How do you guys memorize all of them since the questions in SPM experiments will be randomly out. when u read,u try understand them..let say ticker tape,i dun memorize them..i only use logic n concept when calculating ticker tape....u ask me now,i sure duno... |
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Oct 27 2008, 04:28 PM
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1,360 posts Joined: Aug 2008
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QUOTE(HotChocolate @ Oct 27 2008, 03:27 PM) All the tita will be substituted with x because I can't type tita out. Shouldn't the position of 3 & 4 in the diagram reverse? Cuz sin = o/h2) 2 tan2x = square root x tan2x = (square root x)/2 2x = 40.8934, 220.8934 x = 20.4467, 110.4467 3) Translate them into a diagram. Hope you'll understand. [attachmentid=646442] a)sin (P+Q) =sin P cos Q + cos P sin Q =3/5(-12/13) + 4/5(-5/13) =-56/65 b)tan (P-Q) =(tan P - tan Q) / (1 + tan P tan Q) =(4/3 - 12/5) / [1 + (4/3)(-12/-5)] =-16/63 4)Where are the symbols? What symbol do u mean ?@@ |
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Oct 27 2008, 04:32 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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My bad, you're right.
Check your diagram for number 4. |
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Oct 27 2008, 05:05 PM
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Senior Member
1,360 posts Joined: Aug 2008
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U mean the symbol as + - x divide? Or the solution. Find theta The question is like this lol (1/2) cos^2 2x sec x cosec x - sin2x = 1 I think is times. no put things means times This post has been edited by macamtakada: Oct 27 2008, 05:09 PM |
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Oct 27 2008, 05:24 PM
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Senior Member
1,232 posts Joined: Dec 2005
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seriously, to get rid of confusion, next time use asterisk to replace the symbol 'times/multiply'
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Oct 27 2008, 07:00 PM
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Junior Member
186 posts Joined: Sep 2006 From: Selangor
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Asterisk is this right? : *********
And if that's the one, some people use it for degrees... |
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Oct 27 2008, 08:29 PM
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Junior Member
95 posts Joined: Oct 2008
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Happy Deepavali
This post has been edited by Jojos: Oct 27 2008, 08:29 PM |
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Oct 27 2008, 08:33 PM
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Senior Member
3,871 posts Joined: May 2008
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walaoe..post at here for what.
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Oct 27 2008, 08:39 PM
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Senior Member
1,287 posts Joined: Feb 2008
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Few days until November, 400+ pages of sejarah to go
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Oct 27 2008, 08:41 PM
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Senior Member
3,871 posts Joined: May 2008
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Ujian Daya Tahan Asas ( UDTA) bertujuan untuk mengukur tahap kecergasan pelajar sekolah. Antara aktiviti dalam ujian tersebut ialah
I Bangkit Tubi II Tekan tubi III Jangkauan melunjur IV lari 1500 meter which? is it all? This post has been edited by vick5821: Oct 27 2008, 08:43 PM |
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Oct 27 2008, 08:44 PM
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Senior Member
1,287 posts Joined: Feb 2008
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Why suddenly ask PJK here?
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Oct 27 2008, 08:44 PM
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Senior Member
3,871 posts Joined: May 2008
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hehe..cox i cant find in teks book ma
Added on October 27, 2008, 8:46 pm QUOTE(work_tgr @ Oct 27 2008, 09:10 AM) Not necessary. There is no obvious statement to tell SPM students about what exactly makes the value of pH. Of course, it must be related with the content of OH- and H+. So, week acid such as ethanoic acid of 0.1moldm^-3 could be higher than 1 because it doesn't dissociate completely. But, if the molarity increase to 1moldm^-3 or higher, it could be pH1. work_tgr..u sure for the statement? i thought weak acid the pH would not less than 2 de..always greater than 2? correct? This post has been edited by vick5821: Oct 27 2008, 08:46 PM |
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Oct 27 2008, 08:46 PM
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Senior Member
1,287 posts Joined: Feb 2008
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Forgot everything about PJK. In fact, I never remember anything about PJK except general knowledge.
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Oct 27 2008, 10:09 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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@macamtakada
4) (1/2)(cos2 2x)(1/cos x)(1/sin x) - sin 2x = 1 [(1-sin2 2x) - 2(sin x cos x)(2sin x cos x)]/(sin x cos x) = 2 1-sin2 2x - sin2 2x = 2sin x cos x 0=2sin2 2x + sin 2x - 1 sin 2x = 0.5,-1 2x = 30, 250, 390, 510, 270 ,450 x = 15, 75, 195, 255, 135 ,225 I can't find the red ones. ---------- PJK is not in SPM. Perhaps you have to ask in another thread. I'm sure no people will care bout it. This post has been edited by HotChocolate: Oct 27 2008, 10:59 PM |
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Oct 28 2008, 01:57 AM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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QUOTE(vick5821 @ Oct 27 2008, 08:41 PM) Ujian Daya Tahan Asas ( UDTA) bertujuan untuk mengukur tahap kecergasan pelajar sekolah. Antara aktiviti dalam ujian tersebut ialah 1 and 2 .I Bangkit Tubi II Tekan tubi III Jangkauan melunjur IV lari 1500 meter which? is it all? |
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Oct 28 2008, 07:38 AM
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Senior Member
3,871 posts Joined: May 2008
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III and IV no?? but we got ujian that wor..
This post has been edited by vick5821: Oct 28 2008, 07:38 AM |
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Oct 28 2008, 08:14 AM
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Senior Member
1,360 posts Joined: Aug 2008
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QUOTE(vick5821 @ Oct 27 2008, 08:41 PM) Ujian Daya Tahan Asas ( UDTA) bertujuan untuk mengukur tahap kecergasan pelajar sekolah. Antara aktiviti dalam ujian tersebut ialah Last time is all...I Bangkit Tubi II Tekan tubi III Jangkauan melunjur IV lari 1500 meter which? is it all? This year our school did step up & down the bench to replace 1500 meter run. Dunno whether issit new thing from Kementerian. I am very curious to know where u bought the PJK revision book...... You are the 1st to do PJK.... the usual things happen in PJK exam is question not yet come but the objective answer sheet is already shaded. A normal student can do how many times tekan tubi???? Added on October 28, 2008, 8:19 amSwimming is voluntary action right? How about a person cannot swim but suddenly can swim when he/she is going to drown? Cycling & keeping balance is voluntary or involuntary action? This post has been edited by macamtakada: Oct 28 2008, 08:19 AM |
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Oct 28 2008, 08:33 AM
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Senior Member
3,871 posts Joined: May 2008
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tis paper is last year paper and berkemungkinan my tomorrow PJK exam will use the paper from JPN
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Oct 28 2008, 11:00 AM
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Senior Member
785 posts Joined: May 2007
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QUOTE(work_tgr @ Oct 27 2008, 09:10 AM) Not necessary. Difference between weak acids and strong acids.There is no obvious statement to tell SPM students about what exactly makes the value of pH. Of course, it must be related with the content of OH- and H+. So, week acid such as ethanoic acid of 0.1moldm^-3 could be higher than 1 because it doesn't dissociate completely. But, if the molarity increase to 1moldm^-3 or higher, it could be pH1. Strong acids: 100% dissociation of hydrogen ions Weak acids: less than 1% dissociation of hydrogen ions To measure pH, we need to know the concentration of hydrogen ions in its solution, not the concentration of acid molecules/anions. In strong monoprotic acids, [hydrogen ions] = [anion]. (ratio = 1:1) In strong diprotic acids, [hydrogen ions] = 2 x [anion]. (ratio = 2:1) In weak acids (whether mono-, di-, or triprotic), [hydrogen ions] << [acid molecules]. (ratio = less than 0.01 :1) The larger the concentration of hydrogen ions, the smaller the pH value is. Its converse is also true. But, let weak acid X of 5 mol dm^-3 has 2% dissociation of hydrogen ions. [hydrogen ions present in the solution] = 5 x 2% = 0.1 mol dm^-3 <---- pH=1 If I had compared X with a strong acid of 5 mol dm^-3, the pH of the strong acid would have been much lower than 1. There's no need to worry about weak acids with pH=1. This has been excluded by SPM syllabus. This is useful for foundation in science/engineering, though. |
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Oct 28 2008, 11:05 AM
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Senior Member
3,871 posts Joined: May 2008
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so in SPM syllabus, weak acid not possible to have a pH less than 2?
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Oct 28 2008, 12:03 PM
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Junior Member
277 posts Joined: Dec 2006
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Hmm... According to my TEACHER. ( My uncle actually... so i can really trust him =D )
Weak acid has PH of 3-6. So.... =D |
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Oct 28 2008, 12:50 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(igmroey @ Oct 28 2008, 12:03 PM) Hmm... According to my TEACHER. ( My uncle actually... so i can really trust him =D ) no matter how concentrate?Weak acid has PH of 3-6. So.... =D |
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Oct 28 2008, 02:17 PM
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Junior Member
277 posts Joined: Dec 2006
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Give me some examples. I'll try and enlighten you if i can.
If the question asks Concentrated Ethanoic Acid. IMHO, its still a weak acid. Because ethanoic acid IS A WEAK ACID. For example, A weak man. A weak man is STILL A MAN. Even though he is weak. ( Lol out of topic) |
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Oct 28 2008, 02:23 PM
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Senior Member
3,871 posts Joined: May 2008
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here is the ques
when 0.1 mol dm-3 solution L is tested wiuth pH paper, the colour change shows that solution L has a pH of 3.Which of the following is possibly solution L? A. WEAK ETHANOIC ACID B. DILUTE SULPHURIC ACID C. AMMONIA AQUEOUS SOLUTION D. SODIUM HYDROXIDE SOLUTION. |
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Oct 28 2008, 02:24 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(vick5821 @ Oct 28 2008, 02:23 PM) here is the ques C and D is totally out so I think its Bwhen 0.1 mol dm-3 solution L is tested wiuth pH paper, the colour change shows that solution L has a pH of 3.Which of the following is possibly solution L? A. WEAK ETHANOIC ACID B. DILUTE SULPHURIC ACID C. AMMONIA AQUEOUS SOLUTION D. SODIUM HYDROXIDE SOLUTION. Btw the term [WEAK] ethanoic acid is kinda inappropriate. Shouldn't it be [DILUTE] ethanoic acid? This post has been edited by tonnect91: Oct 28 2008, 02:30 PM |
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Oct 28 2008, 02:33 PM
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Senior Member
3,871 posts Joined: May 2008
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a math ques here.. which of the following is equal to universal set?
A P intersect Q B. P subset Q C. { }' D. P U Q |
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Oct 28 2008, 02:36 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(vick5821 @ Oct 28 2008, 02:33 PM) a math ques here.. which of the following is equal to universal set? D?A P intersect Q B. P subset Q C. { }' D. P U Q |
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Oct 28 2008, 02:39 PM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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C. {} is a null set, {}' means not a null set, which means everything.
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Oct 28 2008, 03:21 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..wait..let me digest first
Added on October 28, 2008, 3:42 pmphysics ques Q1A metal block X of mass 8 kg is heated by an electric heater. The electric heater is marked 240V, 160 W, 40*c rise in temp is obtained after the heater is used for 4 min. Neglect the heat lost , what is the specific heat capacity of metal X in SI unit? Q2 How much heat is needed to change 600g of ice at 0*c to water at 60 *c ( specific latent heat of fusion of ice =3.34 x 10^5, specific heat capcity of water = 4200) This post has been edited by vick5821: Oct 28 2008, 03:42 PM |
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Oct 28 2008, 03:46 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(vick5821 @ Oct 28 2008, 03:21 PM) oh..wait..let me digest first 1) c = 120 J kg^-1 *C^-1Added on October 28, 2008, 3:42 pmphysics ques Q1A metal block X of mass 8 kg is heated by an electric heater. The electric heater is marked 240V, 160 W, 40*c rise in temp is obtained after the heater is used for 4 min. Neglect the heat lost , what is the specific heat capacity of metal X in SI unit? Q2 How much heat is needed to change 600g of ice at 0*c to water at 60 *c ( specific latent heat of fusion of ice =3.34 x 10^5, specific heat capcity of water = 4200) 2)4.852 x 10^5 J |
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Oct 28 2008, 03:47 PM
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Junior Member
306 posts Joined: Jul 2008 From: Subang Jaya
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Version 3 already?
Urh, SPM in two weeks. DARN. D: |
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Oct 28 2008, 03:48 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(tonnect91 @ Oct 28 2008, 03:46 PM) 1) c = 120 J kg^-1 *C^-1 Q2 ans are u sure?2)4.852 x 10^5 J |
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Oct 28 2008, 03:50 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(vick5821 @ Oct 28 2008, 03:48 PM) Q2 ans are u sure? Wrong? |
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Oct 28 2008, 03:50 PM
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Senior Member
3,871 posts Joined: May 2008
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think so..how you do list it out
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Oct 28 2008, 03:51 PM
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Senior Member
1,287 posts Joined: Feb 2008
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3.34 x 10^5 + [0.6 x 4200 x 60]
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Oct 28 2008, 03:52 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(tonnect91 @ Oct 28 2008, 03:51 PM) 3.34 x 10^5 + [0.6 x 4200 x 60] your working i think wrong..you no use mL?? |
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Oct 28 2008, 03:53 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(vick5821 @ Oct 28 2008, 03:52 PM) your working i think wrong..you no use mL?? Oh shit... Sorry 3.516 x 10^5 J |
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Oct 28 2008, 03:54 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..then my ans correct then..haha..thx ya
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Oct 28 2008, 03:56 PM
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Junior Member
306 posts Joined: Jul 2008 From: Subang Jaya
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use Q = mL is it?
how??? D: is it m1L1=M2L2 I bodoh at this chapter, really. |
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Oct 28 2008, 03:58 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(oopsidaisium @ Oct 28 2008, 03:56 PM) use Q = mL is it? mL + mc0 = [0.6 x 3.34 x 10^5] + [0.6 x 4200 x 60]how??? D: is it m1L1=M2L2 I bodoh at this chapter, really. |
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Oct 28 2008, 03:58 PM
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Senior Member
3,871 posts Joined: May 2008
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no la..use mL + mcO
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Oct 28 2008, 03:59 PM
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Junior Member
306 posts Joined: Jul 2008 From: Subang Jaya
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Oh wow. Got that method is it??? D:
Under which subtopic. |
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Oct 28 2008, 04:00 PM
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Senior Member
3,871 posts Joined: May 2008
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tis is combination de..
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Oct 28 2008, 04:01 PM
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Junior Member
306 posts Joined: Jul 2008 From: Subang Jaya
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Oooo, just found it in my book. Phewh.
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Oct 28 2008, 04:01 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(oopsidaisium @ Oct 28 2008, 03:59 PM) Oh wow. Got that method is it??? D: Whenever ice > water or vice versa you need to add mL to the heat required. The same goes to liquid > gas and vice versa. Please note that L varies for different substance.Under which subtopic. |
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Oct 28 2008, 04:13 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(oopsidaisium @ Oct 28 2008, 04:01 PM) Oooo, just found it in my book. Phewh. actually very easy de..Added on October 28, 2008, 4:34 pmanother ques A ballon is filled with gas at atm pressure. The ballon is then immersed into water until its volume is 1/16 of its original volume. what is the depth of the balloon from the surface of the water? ( atm pressure =10m of water) A. 75m B.80m C. 150m D. 160m what made the car hydraulic brake system NOT EFFECTIVE if there is air bubble in the system? A. When the brake is pressed, the air bubble is compressed B. The air bubble will reduce the brake liquid pressure C. The air bubble will expand when the brake is heated up D. The air will flow out when the brake is pressed.. is it A? This post has been edited by vick5821: Oct 28 2008, 04:42 PM |
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Oct 28 2008, 04:47 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(vick5821 @ Oct 28 2008, 04:13 PM) Added on October 28, 2008, 4:34 pmanother ques A ballon is filled with gas at atm pressure. The ballon is then immersed into water until its volume is 1/16 of its original volume. what is the depth of the balloon from the surface of the water? ( atm pressure =10m of water) A. 75m B.80m C. 150m D. 160m what made the car hydraulic brake system NOT EFFECTIVE if there is air bubble in the system? A. When the brake is pressed, the air bubble is compressed B. The air bubble will reduce the brake liquid pressure C. The air bubble will expand when the brake is heated up D. The air will flow out when the brake is pressed.. is it A? 2) A |
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Oct 28 2008, 05:25 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Oct 28 2008, 04:13 PM) another ques 1. CA ballon is filled with gas at atm pressure. The ballon is then immersed into water until its volume is 1/16 of its original volume. what is the depth of the balloon from the surface of the water? ( atm pressure =10m of water) A. 75m B.80m C. 150m D. 160m what made the car hydraulic brake system NOT EFFECTIVE if there is air bubble in the system? A. When the brake is pressed, the air bubble is compressed B. The air bubble will reduce the brake liquid pressure C. The air bubble will expand when the brake is heated up D. The air will flow out when the brake is pressed.. is it A? p1v1=p2v2 v2/v1=p1/p2=1/16 10/(p1+10)=1/16 p1=150m 2. A no air in hydraulic system as air is compressive. |
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Oct 28 2008, 05:52 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..so some of the force will be used to compress the air bubble?
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Oct 28 2008, 06:00 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(vick5821 @ Oct 28 2008, 05:52 PM) oh..so some of the force will be used to compress the air bubble? Yes. The existence of air bubbles reduce the efficiency of the system as some force are used to compress the bubbles. |
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Oct 28 2008, 08:38 PM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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i think for the bubble thing it could be A or B . what is the actual answer
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Oct 28 2008, 08:39 PM
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Senior Member
3,871 posts Joined: May 2008
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C..hahaha..btw..i dunoe la...last year exam paper
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Oct 28 2008, 08:42 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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Second thought, C is a possible answer too.
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Oct 28 2008, 08:55 PM
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Senior Member
765 posts Joined: May 2008
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QUOTE(vick5821 @ Oct 28 2008, 08:33 AM) tis paper is last year paper and berkemungkinan my tomorrow PJK exam will use the paper from JPN And I heard civics too. There were rumors started to spread around my district and some teacher from other school want us to lend them the civic book to introduce to the students. |
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Oct 28 2008, 11:03 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven 
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Damn damn. Need to study account. I don't know nothing about Account.
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Oct 28 2008, 11:20 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(arshad @ Oct 28 2008, 11:03 PM) Damn damn. Need to study account. I don't know nothing about Account. Ya right |
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Oct 29 2008, 12:11 AM
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Senior Member
2,550 posts Joined: Dec 2006
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Reading karangan now...sejarah left 6 chapter...2 is not important...going to spend 2 day to finish it..
Have a questions here,do you guy still going school like usual? |
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Oct 29 2008, 12:38 AM
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Senior Member
1,287 posts Joined: Feb 2008
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I can't find any reason for not going to school.
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Oct 29 2008, 03:13 AM
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Senior Member
671 posts Joined: May 2006
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guys, if we answer extra questions for the essay part in chemistry/physics/biology/sejarah, would our points be deducted? let's say the tell you to answer two out of four question, but i answer four of them...
what'll happen? usually if i do that during school exams my teacher would pick two best scores, but i heard from someone else that their marks will get deducted if they do that. |
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Oct 29 2008, 03:21 AM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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QUOTE(KingKongStudy @ Oct 29 2008, 03:13 AM) guys, if we answer extra questions for the essay part in chemistry/physics/biology/sejarah, would our points be deducted? let's say the tell you to answer two out of four question, but i answer four of them... well king kong . for chem phy bio sej . extra questions wil not be accepted. they wont minus i think. they will just choose the front 2 question.what'll happen? usually if i do that during school exams my teacher would pick two best scores, but i heard from someone else that their marks will get deducted if they do that. but for add maths and mod maths. they choose the best 1. |
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Oct 29 2008, 09:38 AM
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Junior Member
95 posts Joined: Oct 2008
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How about moral and sejarah?
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Oct 29 2008, 09:45 AM
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Senior Member
889 posts Joined: Aug 2008 From: PJ
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moral and sejarah try to ask guideline from the teacher.. maybe they will give some hints and guidelines on which to concentrate..
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Oct 29 2008, 01:47 PM
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Junior Member
186 posts Joined: Sep 2006 From: Selangor
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QUOTE(Jojos @ Oct 29 2008, 09:38 AM) How about moral and sejarah? Moral they choose the first 2 essays, so its better to write at most 3 nilai for the 2 essays you going to choose. I made the mistake of doing 3 essays in trials, that's why I know this About sejarah, is anyone kind enough to clarify the situation? |
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Oct 29 2008, 01:49 PM
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Senior Member
1,287 posts Joined: Feb 2008
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For sejarah they choose 3 best essay. My teacher advise us to write at least 4.
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Oct 29 2008, 01:52 PM
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Senior Member
3,871 posts Joined: May 2008
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during tis final exam..i wrote all..and get 60/60
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Oct 29 2008, 02:04 PM
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Junior Member
495 posts Joined: Sep 2007
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Guys, I had been studying all the subjects for SPM for sometimes now, except for Accounting. And I started to get nervous, can I score if I study, say, next week? I know nuts about Accounting.
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Oct 29 2008, 02:06 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(Xaphier @ Oct 29 2008, 02:04 PM) Guys, I had been studying all the subjects for SPM for sometimes now, except for Accounting. And I started to get nervous, can I score if I study, say, next week? I know nuts about Accounting. No worries I haven't start yet. (Not account but every subject) |
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Oct 29 2008, 02:20 PM
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Junior Member
200 posts Joined: Oct 2007
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i need help with these question. its driving me crazy ! argh
 number 70 and 71 pls !  |
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Oct 29 2008, 02:22 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven
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Wosh. Xaphier, we are in the same situation. Ahaha. I know nuts about accounting.
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Oct 29 2008, 02:26 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(pwincess @ Oct 29 2008, 02:20 PM) i need help with these question. its driving me crazy ! argh see the whole system..70.B...71. C..calcultae wrong number 70 and 71 pls ! This post has been edited by vick5821: Oct 29 2008, 02:46 PM |
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Oct 29 2008, 02:37 PM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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eh vick for the air bubbles in the hydraullic system . the answer really is C?.
QUOTE(vick5821 @ Oct 29 2008, 02:26 PM) see the whole system..70.B...71. B can explain how to do? . the whole physics syllabus this forces in equilibrium is the part i most unfamilliar withThis post has been edited by CluelessNick: Oct 29 2008, 02:39 PM |
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Oct 29 2008, 02:38 PM
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Senior Member
3,871 posts Joined: May 2008
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i dunoe what ans..not given..it's exam paper..last year my friend de..but i think A
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Oct 29 2008, 02:39 PM
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Senior Member
1,287 posts Joined: Feb 2008
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70 B
80 - T = 8a ...1 T = 4a ..........2 Substitute 2 into 1, 80 - 4a = 8a 80 = 12a a = 6.67 m s^-2 71 C 80 - T = 8a...1 T - 8 = 4a.....2 (1) + (2) , 80 - 8 = 12a 12a = 72 a = 6 m s^-2 This post has been edited by tonnect91: Oct 29 2008, 02:43 PM |
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Oct 29 2008, 02:40 PM
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Senior Member
3,871 posts Joined: May 2008
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haha..i no working de..just see
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Oct 29 2008, 02:41 PM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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can show 71 also
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Oct 29 2008, 02:42 PM
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Junior Member
495 posts Joined: Sep 2007
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Wow, guess I wasn't one huh? I got myself a D for my Accounting during Trial LOL.
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Oct 29 2008, 02:47 PM
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Junior Member
55 posts Joined: Oct 2008 From: selangor
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QUOTE(Jojos @ Oct 29 2008, 09:38 AM) How about moral and sejarah? moral is just memorise all the nilai and maksud/kata kunci only...Added on October 29, 2008, 2:49 pm QUOTE(Xaphier @ Oct 29 2008, 02:42 PM) Wow, guess I wasn't one huh? I got myself a D for my Accounting during Trial LOL. my acc worst... normally i just pass only but my spm get 4B... This post has been edited by little_baby: Oct 29 2008, 02:49 PM |
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Oct 29 2008, 03:31 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven
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My account trial E leh.
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Oct 29 2008, 03:33 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(arshad @ Oct 29 2008, 03:31 PM) My account trial E leh. spm u got wat grade? |
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Oct 29 2008, 03:43 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven
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What you mean by what grade??
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Oct 29 2008, 05:01 PM
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Junior Member
495 posts Joined: Sep 2007
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I think he is 17, and going to take the SPM just like us
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Oct 29 2008, 05:03 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(vick5821 @ Oct 28 2008, 04:13 PM) actually very easy de.. Q1 CAdded on October 28, 2008, 4:34 pmanother ques A ballon is filled with gas at atm pressure. The ballon is then immersed into water until its volume is 1/16 of its original volume. what is the depth of the balloon from the surface of the water? ( atm pressure =10m of water) A. 75m B.80m C. 150m D. 160m what made the car hydraulic brake system NOT EFFECTIVE if there is air bubble in the system? A. When the brake is pressed, the air bubble is compressed B. The air bubble will reduce the brake liquid pressure C. The air bubble will expand when the brake is heated up D. The air will flow out when the brake is pressed.. is it A? Q2 C QUOTE(pwincess @ Oct 29 2008, 02:20 PM) i need help with these question. its driving me crazy ! argh Q70 B number 70 and 71 pls ! Q71  Q1 P1V1=P2V2 10V0=(h + 10)(V0/16) h = 150 m Q2 A. Where there is liquid, pressure will be delivered completely regardless of its cross-sectional area and ideally non-transferable between different mediums. B. read above C. When air bubble occupies whole cross-section of the tube, there will not be any pressure transfer. D. LOLOLOLOL BRILLIANT Q70 resultant force on the system (downwards) = 80 - 40 = 40N resultant acceleration = 40/12 = 6.67m s^-2 Q71 resultant force on the system (downwards) = 80 - 40 - 8 = 72N resultant acceleration = 72/12 = 6m s^-2 This post has been edited by IamjustME: Oct 29 2008, 05:36 PM |
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Oct 29 2008, 05:21 PM
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Senior Member
3,871 posts Joined: May 2008
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71 is C
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Oct 29 2008, 05:32 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven
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I am 17 and I'm taking SPM this year.
p/s: Woot. 1k posts!! |
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Oct 29 2008, 05:35 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(IamjustME @ Oct 29 2008, 05:03 PM) Q1 C for Q 2...nt A?Q2 C Q70 B Q71 Working comes later. |
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Oct 29 2008, 05:37 PM
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Junior Member
495 posts Joined: Sep 2007
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QUOTE(arshad @ Oct 29 2008, 05:32 PM) I am 17 and I'm taking SPM this year. Cool, you're 17 and you owned a DSLR, god. I think whole of your signature should be copy and paste on mine instead, and title with Wish List. p/s: Woot. 1k posts!! |
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Oct 29 2008, 05:40 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven
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Dslr only mah. Not rolls royce.
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Oct 29 2008, 05:59 PM
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Junior Member
495 posts Joined: Sep 2007
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Meh...you must be rich kid. By the way, how you manage to study with that PS3 and Xbox360 shine on you?
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Oct 29 2008, 06:09 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(arshad @ Oct 29 2008, 05:32 PM) I am 17 and I'm taking SPM this year. oh. sorry. i thought uva taken spm edi. p/s: Woot. 1k posts!! |
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Oct 29 2008, 06:10 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven
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You thought I got study before meh?
Just few weeks only started studying. :S |
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Oct 29 2008, 06:13 PM
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Junior Member
200 posts Joined: Oct 2007
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me too wor. i cant study too early coz i'll forgot everything.
now only i start study. wah~ i just woke up. everytime i study, i feel like i wanna sleep lol |
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Oct 29 2008, 06:36 PM
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Senior Member
1,527 posts Joined: Apr 2005 From: Heaven
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But I don't think I have enough time to cover em.
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Oct 29 2008, 06:38 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(arshad @ Oct 29 2008, 06:10 PM) You thought I got study before meh? here's a ques on phy Just few weeks only started studying. :SAttached thumbnail(s) 
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Oct 29 2008, 06:38 PM
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Junior Member
200 posts Joined: Oct 2007
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dun say like that.
just try ur best to cover all of em. im sure u'll be ok |
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Oct 29 2008, 06:51 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(IamjustME @ Oct 29 2008, 05:03 PM) Q1 C You don't have to minus 40.Q2 C Q70 B Q71 Q1 P1V1=P2V2 10V0=(h + 10)(V0/16) h = 150 m Q2 A. Where there is liquid, pressure will be delivered completely regardless of its cross-sectional area and ideally non-transferable between different mediums. B. read above C. When air bubble occupies whole cross-section of the tube, there will not be any pressure transfer. D. LOLOLOLOL BRILLIANT Q70 resultant force on the system (downwards) = 80 - 40 = 40N resultant acceleration = 40/12 = 6.67m s^-2 Q71 resultant force on the system (downwards) = 80 - 40 - 8 = 72N resultant acceleration = 72/12 = 6m s^-2 It's straight 80/12 = 6.67 |
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Oct 29 2008, 06:54 PM
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Junior Member
168 posts Joined: Jan 2003 From: ~uToPia~
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just to share, tips from TimesGuide (www.timesguides.com),
u can do it as exercise... there are altogether 10 subjects, BM, BI, Sej, Maths, A.Maths, Fizik, Kimia, Bio, Sains, P.Akaun Tips on year 2007 http://rapidshare.com/files/158623833/Times_2007.zip Tips on year 2008 http://rapidshare.com/files/158630709/Times_2008.zip |
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Oct 29 2008, 07:03 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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did i just really see what i saw?
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Oct 29 2008, 07:06 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(vick5821 @ Oct 29 2008, 06:38 PM) here's a ques on phy It's negative zero error which means you have to add to the value you read.So, D,E is out. Then you have to take 1-0.03 = 0.07cm. Just refer to your book. If you don't understand, don't blindly just post it up here. Check the book before you post. |
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Oct 29 2008, 07:14 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..negative zero error count from behind?
last ques when a liquid chages to vapour at atmospheric pressure, 1 cm3 of the liquid is changed to 1.4 x 10^3 cm3 of vapour. What is the ratio of the density of liquid to the density of the vapour? This post has been edited by vick5821: Oct 29 2008, 07:16 PM |
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Oct 29 2008, 07:16 PM
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Junior Member
200 posts Joined: Oct 2007
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no lar. its -(0.1-0.03)=-0.07
if its wrong, then im sorry. lol This post has been edited by pwincess: Oct 29 2008, 07:17 PM |
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Oct 29 2008, 07:17 PM
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Senior Member
3,871 posts Joined: May 2008
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i see wrongly..forgot jor negative error must see from behind not in front
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Oct 29 2008, 07:21 PM
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Junior Member
111 posts Joined: Oct 2006
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anyone got sej tips? TT
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Oct 29 2008, 07:22 PM
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Junior Member
200 posts Joined: Oct 2007
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phy ques oso.
ive searched for it in the book and i found it. but hell, i understand nothing. A brick with mass 2 kg slipped from a worker's hand at height 45 m from the surface of the Earth. What is the momentum of the brick just before it hits the ground? |
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Oct 29 2008, 07:24 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(vick5821 @ Oct 29 2008, 07:14 PM) oh..negative zero error count from behind? Both liquid and water have same mass.last ques when a liquid chages to vapour at atmospheric pressure, 1 cm3 of the liquid is changed to 1.4 x 10^3 cm3 of vapour. What is the ratio of the density of liquid to the density of the vapour? mass before evaporation = mass after evaporation ρ1V1 = ρ2V2 ρ1(1) = ρ2(1.4 x 10^3 cm^3) ρ1/ρ2 = 1.4 x 10^3 density of water : density of vapour = 1.4 x 10^3 : 1 |
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Oct 29 2008, 07:34 PM
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Junior Member
186 posts Joined: Sep 2006 From: Selangor
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Tonnect91, I have a question about moral essay.
About the 4 sentence format, do we need to write the definition of the nilai such that there is a relation of the definition to the essay question? Or can i just write out the definition without any relation to the question? |
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Oct 29 2008, 07:38 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(IamjustME @ Oct 29 2008, 07:24 PM) Both liquid and water have same mass. why both have same mass?mass before evaporation = mass after evaporation ρ1V1 = ρ2V2 ρ1(1) = ρ2(1.4 x 10^3 cm^3) ρ1/ρ2 = 1.4 x 10^3 density of water : density of vapour = 1.4 x 10^3 : 1 Added on October 29, 2008, 7:39 pm QUOTE(pwincess @ Oct 29 2008, 07:22 PM) phy ques oso. mgh=1/2 mv^2...find the velocity before hit the ground..the p=mv loive searched for it in the book and i found it. but hell, i understand nothing. A brick with mass 2 kg slipped from a worker's hand at height 45 m from the surface of the Earth. What is the momentum of the brick just before it hits the ground? This post has been edited by vick5821: Oct 29 2008, 07:39 PM |
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Oct 29 2008, 08:21 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 29 2008, 07:38 PM) why both have same mass? of course la....even u chg to vapour,still the same mass lo.... |
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Oct 29 2008, 08:24 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..so we assume all the liquid change to vapour la?? just the volume not same?
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Oct 29 2008, 08:26 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 29 2008, 08:24 PM) oh..so we assume all the liquid change to vapour la?? just the volume not same? let say i convert water to gas,then back to water...mass same rite?(assume no gas escape)Volume sure not same mah....liquid molecule is much closer compare to gas... Added on October 29, 2008, 8:27 pmhttp://www.andrewchoo.com.my/component/option,com_frontpage/Itemid,1/ Anybody believe??? This post has been edited by sasaug: Oct 29 2008, 08:27 PM |
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Oct 29 2008, 08:28 PM
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Senior Member
3,871 posts Joined: May 2008
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so gas volume will be larger?
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Oct 29 2008, 08:28 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 29 2008, 08:28 PM) so gas volume will be larger? yep..on the same substance that u are talking about..... |
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Oct 29 2008, 08:30 PM
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Senior Member
3,871 posts Joined: May 2008
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so volume of solid is smallest.then liquid moderate and gas laregest..just an exception for ice?? the volume of ice is larger then liquid
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Oct 29 2008, 08:31 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 29 2008, 08:30 PM) so volume of solid is smallest.then liquid moderate and gas laregest..just an exception for ice?? the volume of ice is larger then liquid lolz.....u make me confuse now...ice will expand around 4 degree celcius if i am not mistaken......i oso blur blur...better checkout with others... |
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Oct 29 2008, 08:46 PM
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Senior Member
3,871 posts Joined: May 2008
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ice is an exception..the density of ice is smaller than water..so it float..density smaller, volume bigger
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Oct 29 2008, 08:51 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 29 2008, 08:46 PM) ice is an exception..the density of ice is smaller than water..so it float..density smaller, volume bigger p=m/vm/v = density Now i know... |
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Oct 29 2008, 08:52 PM
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Senior Member
3,871 posts Joined: May 2008
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the volume is inversly propotional to density de
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Oct 29 2008, 09:37 PM
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Junior Member
200 posts Joined: Oct 2007
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another question.
When a horizontal force is applied on a 3kg wooden block, the block moves at a uniform velocity. If the force is increased up to 18N, what is the (new) acceleration of the block? |
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Oct 29 2008, 09:39 PM
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Senior Member
3,871 posts Joined: May 2008
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u sure ur ques?
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Oct 29 2008, 09:41 PM
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Junior Member
385 posts Joined: Jul 2006
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I need help with sejarah.. really need this. I have no idea what is it talking about, and have no way to remember.
Does following the syalabus(doesn't consist of 100% of the text book) help? I am willing to help in sciences in return. |
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Oct 29 2008, 09:45 PM
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Senior Member
3,871 posts Joined: May 2008
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SJ is easy la..just study everyday lo..no shortcut one
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Oct 29 2008, 09:45 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(pwincess @ Oct 29 2008, 09:37 PM) another question. F=maWhen a horizontal force is applied on a 3kg wooden block, the block moves at a uniform velocity. If the force is increased up to 18N, what is the (new) acceleration of the block? but it cant work in this kind of situation... |
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Oct 29 2008, 09:49 PM
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Senior Member
3,871 posts Joined: May 2008
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how much is the horizontal force? got mention?
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Oct 29 2008, 09:52 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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I think the ques got prob gua..Show uas the pic if possible..
Physics ques need pics to solve..(most of them) |
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Oct 29 2008, 09:54 PM
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Senior Member
3,871 posts Joined: May 2008
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i think she left smth
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Oct 29 2008, 09:56 PM
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Junior Member
200 posts Joined: Oct 2007
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ya. im sure. i dont know to use which formula
Added on October 29, 2008, 9:57 pmthere's no diagram or anything. maybe that question is wrong? This post has been edited by pwincess: Oct 29 2008, 09:57 PM |
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Oct 29 2008, 09:58 PM
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Senior Member
3,871 posts Joined: May 2008
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no formula to be used leh as ques nt complete
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Oct 29 2008, 09:58 PM
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Junior Member
277 posts Joined: Dec 2006
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QUOTE(MaggieMee @ Oct 29 2008, 09:41 PM) I need help with sejarah.. really need this. I have no idea what is it talking about, and have no way to remember. Sejarah is d worst-hellofa subject that d Malaysian Education Minister shd NEVA put in SPM. Seriously, you're not the only one facing this problem bro.Does following the syalabus(doesn't consist of 100% of the text book) help? I am willing to help in sciences in return. My advice is, Go to a library. Or, throw away your comp, phone, tele, PS, balblabla... Go to library. Tell ur mum to lock ur comp. etc etc.... Im sure you will have no choice but to FOREC URSELF to study. DOn't worry, you'll do fine =D |
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Oct 29 2008, 09:58 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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they got the 4 formula....u tried them?
Added on October 29, 2008, 9:59 pm QUOTE(igmroey @ Oct 29 2008, 09:58 PM) Sejarah is d worst-hellofa subject that d Malaysian Education Minister shd NEVA put in SPM. Seriously, you're not the only one facing this problem bro. LOLz....Sejarah...relax and you will found your way out...My advice is, Go to a library. Or, throw away your comp, phone, tele, PS, balblabla... Go to library. Tell ur mum to lock ur comp. etc etc.... Im sure you will have no choice but to FOREC URSELF to study. DOn't worry, you'll do fine =D This post has been edited by sasaug: Oct 29 2008, 09:59 PM |
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Oct 29 2008, 09:59 PM
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Junior Member
200 posts Joined: Oct 2007
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ive tried every formula. but how to substitute in the formula if the ques gives the weight only.
Added on October 29, 2008, 10:01 pm QUOTE(MaggieMee @ Oct 29 2008, 09:41 PM) I need help with sejarah.. really need this. I have no idea what is it talking about, and have no way to remember. we are in the same boat, MaggieMee. Does following the syalabus(doesn't consist of 100% of the text book) help? I am willing to help in sciences in return.  hate sej This post has been edited by pwincess: Oct 29 2008, 10:01 PM |
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Oct 29 2008, 10:01 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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Guys..Here got alot of Physics, Chem, add math ques..
Why no BIO ques here?? U all too pro in bio??? |
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Oct 29 2008, 10:02 PM
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Senior Member
3,871 posts Joined: May 2008
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no..i am weak in bio..but luckily got tui
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Oct 29 2008, 10:02 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(gzavincent @ Oct 29 2008, 10:01 PM) Guys..Here got alot of Physics, Chem, add math ques.. some dont take it.......but i am not the lucky ones...hahaWhy no BIO ques here?? U all too pro in bio??? |
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Oct 29 2008, 10:02 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(pwincess @ Oct 29 2008, 09:59 PM) ive tried every formula. but how to substitute in the formula if the ques gives the weight only. Same here.. I give up sej d...Don't even care bout it..Added on October 29, 2008, 10:01 pm we are in the same boat, MaggieMee. hate sej |
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Oct 29 2008, 10:02 PM
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Junior Member
200 posts Joined: Oct 2007
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not too pro in bio. just that bio read only can understand wat
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Oct 29 2008, 10:03 PM
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Senior Member
3,871 posts Joined: May 2008
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the ques really like that? impossible..cant solved if like that..haiz..dunoe how much is the friction
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Oct 29 2008, 10:04 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Oct 29 2008, 10:02 PM) no..i am weak in bio..but luckily got tui Well that's nice...I no tuition..Study my self..Among 3 science subject i most worry BIO...And i cant study it now..Sure forget.. So before bio 1 week only study.. Added on October 29, 2008, 10:05 pm QUOTE(pwincess @ Oct 29 2008, 10:02 PM) not too pro in bio. just that bio read only can understand wat Read can understand?? LOL..I so blurr when read it...My teacher aim this year kidney and DCPIP coming out.. A few states came out DCPIP... This post has been edited by gzavincent: Oct 29 2008, 10:05 PM |
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Oct 29 2008, 10:06 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(vick5821 @ Oct 29 2008, 10:03 PM) the ques really like that? impossible..cant solved if like that..haiz..dunoe how much is the friction yup2. i think this book is not goodmost of the question wrong  Added on October 29, 2008, 10:09 pm QUOTE(gzavincent @ Oct 29 2008, 10:04 PM) Well that's nice...I no tuition..Study my self.. i luvs dcpip and kidney. i sure do hope both of em come out Among 3 science subject i most worry BIO...And i cant study it now..Sure forget.. So before bio 1 week only study.. Added on October 29, 2008, 10:05 pm Read can understand?? LOL.. I so blurr when read it...My teacher aim this year kidney and DCPIP coming out.. A few states came out DCPIP... This post has been edited by pwincess: Oct 29 2008, 10:09 PM |
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Oct 29 2008, 10:11 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(pwincess @ Oct 29 2008, 10:06 PM) yup2. i think this book is not good DCPIP i no problem..Problem kidney...It so confusing...most of the question wrong Added on October 29, 2008, 10:09 pm i luvs dcpip and kidney. i sure do hope both of em come out |
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Oct 29 2008, 10:12 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(sasaug @ Oct 29 2008, 08:51 PM) p=m/v Your p is pressure or roll (how you spell that)?m/v = density Now i know... Pressure = Force/Volume Roll or Density = Mass/Volume Roll and density is the same fyi. QUOTE(pwincess @ Oct 29 2008, 09:37 PM) another question. F=ma?When a horizontal force is applied on a 3kg wooden block, the block moves at a uniform velocity. If the force is increased up to 18N, what is the (new) acceleration of the block? 18 = 3a a = 6ms-2 the uniform velocity meant there is no resultant force (or friction). Or is it? Not too sure |
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Oct 29 2008, 10:13 PM
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Junior Member
200 posts Joined: Oct 2007
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kidney is quite easy if u understand the whole process. i have trouble understanding meosis mitosis all that
Added on October 29, 2008, 10:15 pm QUOTE(HotChocolate @ Oct 29 2008, 10:12 PM) Your p is pressure or roll (how you spell that)? i get the same answer as u. but the answer in the book is 4.Pressure = Force/Volume Roll or Density = Mass/Volume Roll and density is the same fyi. F=ma? 18 = 3a a = 6ms-2 the uniform velocity meant there is no resultant force (or friction). Or is it? Not too sure the ques got prob maybe This post has been edited by pwincess: Oct 29 2008, 10:15 PM |
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Oct 29 2008, 10:34 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(goldmahkot @ Oct 29 2008, 07:34 PM) Tonnect91, I have a question about moral essay. Ok every question in Moral regarding definisi need to have relation with the situasi UNLESS they ask for maksud nilai. This include essay question. You can't just blindly write out the definisi. Check the example given About the 4 sentence format, do we need to write the definition of the nilai such that there is a relation of the definition to the essay question? Or can i just write out the definition without any relation to the question? |
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Oct 29 2008, 10:36 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(pwincess @ Oct 29 2008, 10:13 PM) kidney is quite easy if u understand the whole process. i have trouble understanding meosis mitosis all that Constant velocity means zero acceleration.Added on October 29, 2008, 10:15 pm i get the same answer as u. but the answer in the book is 4. the ques got prob maybe So following F=ma, the resultant force needs to be zero, to cause the acceleration = 0. Thus there is a frictional force needed to cause the resultant force = 0 So, I think they left out a 6N of horizontal force. Then, the calculation will be like this. 18-6 = 3a 12 = 3a a = 4ms-2 Not quite too sure again. Someone can verify or acknowledge what I'm trying to say? If I'm wrong, correct me too. Thanks This post has been edited by HotChocolate: Oct 29 2008, 10:38 PM |
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Oct 29 2008, 10:46 PM
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Senior Member
765 posts Joined: May 2008
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QUOTE(HotChocolate @ Oct 29 2008, 10:12 PM) Your p is pressure or roll (how you spell that)? Rho. That's right! That's how you pronounce. Pressure = Force/Volume Roll or Density = Mass/Volume Roll and density is the same fyi. F=ma? 18 = 3a a = 6ms-2 the uniform velocity meant there is no resultant force (or friction). Or is it? Not too sure |
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Oct 29 2008, 10:50 PM
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Senior Member
1,287 posts Joined: Feb 2008
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To solve all your Greek alphabet pronunciation problem visit http://en.wikipedia.org/wiki/Greek_alphabet#Main_letters
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Oct 30 2008, 12:55 AM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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hey any1 know cikgu daiwa?
ppl say his notes for sejarah is effective and accurate. i just need some1 to clarify this . |
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Oct 30 2008, 12:15 PM
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Senior Member
2,550 posts Joined: Dec 2006
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QUOTE(CluelessNick @ Oct 30 2008, 12:55 AM) hey any1 know cikgu daiwa? I tuition with cikgu daiwa teacher,cikgu siiva..ppl say his notes for sejarah is effective and accurate. i just need some1 to clarify this . Their note is very similar and effective...but no one know weather it is accurate. |
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Oct 30 2008, 12:33 PM
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Junior Member
200 posts Joined: Oct 2007
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really? u still have em?
post it up here! |
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Oct 30 2008, 02:25 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(pwincess @ Oct 30 2008, 12:33 PM) really? u still have em? one phy ques herepost it up here! This post has been edited by vick5821: Oct 30 2008, 02:28 PM Attached thumbnail(s) 
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Oct 30 2008, 02:30 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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P
=(0.7+0.2)(13600)(10) =1.224x105 Am not good in this question, what's the answer? |
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Oct 30 2008, 02:32 PM
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Senior Member
3,871 posts Joined: May 2008
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it said mercury onli wor.nid to add the 70 cm?.tis is today my exam ques..haih..hope nt ur working..
This post has been edited by vick5821: Oct 30 2008, 02:37 PM |
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Oct 30 2008, 02:35 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(HotChocolate @ Oct 30 2008, 02:30 PM) P i think ur rite. coz the pressure inside the vacuum is equal to the pressure of the mercury.=(0.7+0.2)(13600)(10) =1.224x105 Am not good in this question, what's the answer? think so |
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Oct 30 2008, 02:36 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(HotChocolate @ Oct 30 2008, 02:30 PM) P correct =(0.7+0.2)(13600)(10) =1.224x105 Am not good in this question, what's the answer? |
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Oct 30 2008, 02:37 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(work_tgr @ Oct 30 2008, 02:36 PM) correct but it said mercury onli..not mean total pressure |
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Oct 30 2008, 02:40 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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ignore this ... I think it is not correct. This post has been edited by work_tgr: Oct 30 2008, 02:43 PM |
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Oct 30 2008, 02:40 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Oct 30 2008, 02:37 PM) but it said mercury onli..not mean total pressure Their answer correct...Vacumm no pressure..Mean pressure exerted on x is 90cmHg |
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Oct 30 2008, 02:42 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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-- but this question is tricky.
20cmHg might be correct and it depends on how your teacher interpret it. "fight" for marks if you want. This post has been edited by work_tgr: Oct 30 2008, 02:44 PM |
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Oct 30 2008, 02:44 PM
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Senior Member
3,871 posts Joined: May 2008
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but at the bottom also X..so just 20 cm ma
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Oct 30 2008, 02:45 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Oct 30 2008, 02:44 PM) but at the bottom also X..so just 20 cm ma ya, see my correction.just 1 mark only, donate it lah. |
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Oct 30 2008, 02:49 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(work_tgr @ Oct 30 2008, 02:42 PM) -- but this question is tricky. sure..so you sokong me? must got ppl sokong so can fight..but many of my friend write 90 cm Hg la..just me 20 cm Hg..so die la..hard to fught..must many ppl sokong me20cmHg might be correct and it depends on how your teacher interpret it. "fight" for marks if you want. This post has been edited by vick5821: Oct 30 2008, 02:55 PM |
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Oct 30 2008, 02:58 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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Wouldn't die lah. 1 mark only. so kiasu meh ?
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Oct 30 2008, 03:00 PM
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Senior Member
3,871 posts Joined: May 2008
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i wan is fact..i also kia su..it just said mercury la...so confuse me..i changed it from 90 cm Hg to 20cm Hg...i wan learn thing la.
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Oct 30 2008, 03:04 PM
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Junior Member
280 posts Joined: Jun 2007
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spm passed ady
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Oct 30 2008, 03:12 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Oct 30 2008, 03:00 PM) i wan is fact..i also kia su..it just said mercury la...so confuse me..i changed it from 90 cm Hg to 20cm Hg...i wan learn thing la. In that case, your teacher has the ultimate power to give exam marks. Your answer is correct. |
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Oct 30 2008, 03:13 PM
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Junior Member
114 posts Joined: Aug 2008 From: penang
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hey
for moral esei my school teacher advise us to use this format: N ( 3 in 1 sentence) P ( 2 in 1 sentence) C C P ( 2 in 1 sentence) C C P ( 2 in 1 sentence) C C this format is done in one paragraph IS this format acceptable? This post has been edited by coldblood: Oct 30 2008, 03:13 PM |
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Oct 30 2008, 04:33 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(work_tgr @ Oct 30 2008, 03:12 PM) In that case, your teacher has the ultimate power to give exam marks. Your answer is correct. if my teacher give me wrong? |
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Oct 30 2008, 04:41 PM
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Senior Member
785 posts Joined: May 2007
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90cm Hg.
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Oct 30 2008, 04:50 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 30 2008, 02:25 PM) one phy ques here at point X,i think is 90cm Hg.coz normally when we calculate pressure at a point,we always add atmospheric pressure.when in vacumm,the pressure is 0 so it is 70cm+20cm...tat is what i think la....correct me if i am wrongAdded on October 30, 2008, 4:52 pmAny people in trouble with Bio chap 8 form 4??those kingdom really need many many reading lo....btw,mitosis n meiosis arent very hard...quite simple..one photostat,another break then photostat... This post has been edited by sasaug: Oct 30 2008, 04:52 PM |
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Oct 30 2008, 04:52 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Oct 30 2008, 04:33 PM) if my teacher give me wrong? Argue till the hell ... screw him or be screwed -- As I say, just donate that 1 mark lah ... Tuhan tau you r right |
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Oct 30 2008, 05:01 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(sasaug @ Oct 30 2008, 04:50 PM) Any people in trouble with Bio chap 8 form 4??those kingdom really need many many reading lo....btw,mitosis n meiosis arent very hard...quite simple..one photostat,another break then photostat... abiotic factors of sustainability in microorganisms >> classification and features of kingdomsMy mind has a low reading and writing speed; I didn't touched kingdoms at all back then. |
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Oct 30 2008, 05:02 PM
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Senior Member
3,871 posts Joined: May 2008
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dun want.. 1 mark also important la...hope the skema is my ans correct..cause it just said mercury..not said total pressure
Added on October 30, 2008, 5:46 pmguys..my exam finished..i can teach u all This post has been edited by vick5821: Oct 30 2008, 05:46 PM |
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Oct 30 2008, 05:53 PM
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Junior Member
200 posts Joined: Oct 2007
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question no 1 and 2 pls !
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Oct 30 2008, 06:22 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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1. 10/4=2.5m/s
2. 340x5=1700m |
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Oct 30 2008, 07:11 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(coldblood @ Oct 30 2008, 03:13 PM) hey All in one paragraph? I don't think so. And for the nilai, I would advise you not to cramp 3 in one sentence. Its best to write one nilai in each paragraph, following by its respective huraian and contoh.for moral esei my school teacher advise us to use this format: N ( 3 in 1 sentence) P ( 2 in 1 sentence) C C P ( 2 in 1 sentence) C C P ( 2 in 1 sentence) C C this format is done in one paragraph IS this format acceptable? |
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Oct 30 2008, 07:47 PM
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Junior Member
200 posts Joined: Oct 2007
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i duno this ques. help me.
When a footballer kicks a ball which is at rest, a force of 20N is applied in 0.5 s. The impulse that is given to the ball is ? This post has been edited by pwincess: Oct 30 2008, 08:01 PM |
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Oct 30 2008, 08:07 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(pwincess @ Oct 30 2008, 07:47 PM) i duno this ques. help me. use the impulsive force formula.....When a footballer kicks a ball which is at rest, a force of 20N is applied in 0.5 s. The impulse that is given to the ball is ? |
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Oct 30 2008, 08:12 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(tonnect91 @ Oct 30 2008, 07:11 PM) All in one paragraph? I don't think so. And for the nilai, I would advise you not to cramp 3 in one sentence. Its best to write one nilai in each paragraph, following by its respective huraian and contoh. All in 1 paragraph..Cannot separate..But nilai must be separate..N P (2 kata kunci) C C N P (2 kata kunci) C C |
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Oct 30 2008, 08:19 PM
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Senior Member
2,379 posts Joined: Dec 2005
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At x or at any place same level of x, the pressure is the same.
Say at the left side of x, we can do a equation which looks like this Total Pressure(at left of x)=P(atm)+P(20cmHG) Unfortunately, we dont know the atmosphere pressure. Therefore, we can do equation for x Total pressure(at x)= (70cmHG)+P(20cmHG) since at same level, pressure is the same, pressure=90cmHG |
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Oct 30 2008, 08:29 PM
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Junior Member
200 posts Joined: Oct 2007
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i know i have to use the impulsive force fromula. but what is the value of m?
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Oct 30 2008, 08:34 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(pwincess @ Oct 30 2008, 07:47 PM) i duno this ques. help me. Fxs=impulse=20*0.5=10NsWhen a footballer kicks a ball which is at rest, a force of 20N is applied in 0.5 s. The impulse that is given to the ball is ? |
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Oct 30 2008, 08:35 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(pwincess @ Oct 30 2008, 08:29 PM) i know i have to use the impulsive force fromula. but what is the value of m? should put the mass of the football for m.... |
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Oct 30 2008, 08:41 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(work_tgr @ Oct 30 2008, 08:34 PM) Fxs=impulse=20*0.5=10Ns ic. thx  another ques. num 17 and 19 pls.  |
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Oct 30 2008, 08:56 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(ryansxs @ Oct 30 2008, 08:19 PM) At x or at any place same level of x, the pressure is the same. but it said that pressure exerted by mercury onli..not total pressure lehSay at the left side of x, we can do a equation which looks like this Total Pressure(at left of x)=P(atm)+P(20cmHG) Unfortunately, we dont know the atmosphere pressure. Therefore, we can do equation for x Total pressure(at x)= (70cmHG)+P(20cmHG) since at same level, pressure is the same, pressure=90cmHG |
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Oct 30 2008, 09:00 PM
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Senior Member
671 posts Joined: May 2006
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my God, i tried studying sejarah and i already read half a chapter and then i fall asleep....
haven't even start reading biology and agama. =[ |
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Oct 30 2008, 09:01 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(pwincess @ Oct 30 2008, 08:41 PM) ic. thx 19.use mgh another ques. num 17 and 19 pls. |
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Oct 30 2008, 09:06 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(KingKongStudy @ Oct 30 2008, 09:00 PM) my God, i tried studying sejarah and i already read half a chapter and then i fall asleep.... same with me. i hate memorizing haven't even start reading biology and agama. =[  |
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Oct 30 2008, 09:13 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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Q. 17, find out the tension of string for both M and m
Msin30=msin45 M/m=sin45/sin30 |
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Oct 30 2008, 09:35 PM
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Senior Member
3,871 posts Joined: May 2008
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sigh la..if i got fight with teacher the ques..many student will blame me..will hate me..nvm..pls give me all ur physics teacher hp number..haha..if my teacher mark it wrong, then call them...ahahahaha
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Oct 30 2008, 09:41 PM
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Junior Member
267 posts Joined: Dec 2006
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hell yeah !!1week + more to go !
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Oct 30 2008, 09:57 PM
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Senior Member
3,871 posts Joined: May 2008
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chemistry chap 8 hard to learn by myself?
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Oct 30 2008, 09:59 PM
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Junior Member
200 posts Joined: Oct 2007
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is it acid and base?
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Oct 30 2008, 10:00 PM
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Senior Member
3,871 posts Joined: May 2008
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salts..acid and bases quite fun..abt the neutralistion
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Oct 30 2008, 10:02 PM
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Junior Member
200 posts Joined: Oct 2007
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oh. salts. its quite easy if u memorize all of em.
which part u din understand? |
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Oct 30 2008, 10:03 PM
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Senior Member
3,871 posts Joined: May 2008
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haven study yet..wanna start later..study form 4 phy last chap..light
Added on October 30, 2008, 10:43 pmany method to memorise soluble and insoluble salt? This post has been edited by vick5821: Oct 30 2008, 10:43 PM |
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Oct 30 2008, 11:08 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Oct 30 2008, 08:56 PM) but it said that pressure exerted by mercury onli..not total pressure leh The 70cm also exerted pressure on x..It raise up because of the atmospheric pressure.. |
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Oct 30 2008, 11:20 PM
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Senior Member
3,871 posts Joined: May 2008
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x can be anywhere..if nt at there..it just 20 cm Hg..pressure at same level is equal la..
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Oct 30 2008, 11:22 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Oct 30 2008, 11:20 PM) x can be anywhere..if nt at there..it just 20 cm Hg..pressure at same level is equal la.. Now the x is at bottom..You must add that 70cmHg...Because it exerted presssure on x also...You must answer according to the diagram.. |
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Oct 30 2008, 11:27 PM
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Senior Member
3,871 posts Joined: May 2008
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no idea
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Oct 30 2008, 11:29 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Oct 30 2008, 11:27 PM) no idea If the x at other place, you also must add up atmospgeric pressure..So it's just the same.. |
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Oct 30 2008, 11:31 PM
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Senior Member
3,871 posts Joined: May 2008
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but..the ques ask for pressure exerted by mercury
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Oct 30 2008, 11:33 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Oct 30 2008, 10:03 PM) haven study yet..wanna start later..study form 4 phy last chap..light SAP salt solubleAdded on October 30, 2008, 10:43 pmany method to memorise soluble and insoluble salt? S(silver) M(mercury) L(lead2) nitrate insoluble..Remember SML, small medium large B(barium) C(calcium) L(lead2) sulphate insoluble. All carbonate in soluble.. All nitrate soluble.. Added on October 30, 2008, 11:34 pm QUOTE(vick5821 @ Oct 30 2008, 11:31 PM) but..the ques ask for pressure exerted by mercury Ya they asking exerted by mercury..So you dun move the x...Above x got mercury?Got then add it.. This post has been edited by gzavincent: Oct 30 2008, 11:34 PM |
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Oct 30 2008, 11:58 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(gzavincent @ Oct 30 2008, 11:33 PM) SAP salt soluble My tuition teacher told us like this:S(silver) M(mercury) L(lead2) nitrate insoluble..Remember SML, small medium large B(barium) C(calcium) L(lead2) sulphate insoluble. All carbonate insoluble.. All nitrate soluble.. Added on October 30, 2008, 11:34 pm Ya they asking exerted by mercury..So you dun move the x...Above x got mercury? Got then add it.. Insoluble Sulphate salt Pb (Lead) - Persatuan Ba (Barium) - Bahasa Ca (Calcium) - Cina Insoluble Chloride salt Pb(Lead) - Persatuan Ag (Silver)- Agama Hg (Mercury) - Hindu All Carbonate are insoluble except Sodium, Potassium, Ammonium Carbonate. |
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Oct 31 2008, 12:01 AM
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Junior Member
200 posts Joined: Oct 2007
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im confused~
 do this question.  |
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Oct 31 2008, 12:03 AM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(HotChocolate @ Oct 30 2008, 11:58 PM) My tuition teacher told us like this: Got many ways to memorize it..Insoluble Sulphate salt Pb (Lead) - Persatuan Ba (Barium) - Bahasa Ca (Calcium) - Cina Insoluble Chloride salt Pb(Lead) - Persatuan Ag (Silver)- Agama Hg (Mercury) - Hindu All Carbonate are insoluble except Sodium, Potassium, Ammonium Carbonate. Depends on own teacher.. Added on October 31, 2008, 12:10 am QUOTE(pwincess @ Oct 31 2008, 12:01 AM) im confused~ What is the answer? do this question. This post has been edited by gzavincent: Oct 31 2008, 12:10 AM |
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Oct 31 2008, 12:13 AM
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Junior Member
200 posts Joined: Oct 2007
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tha answer is A
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Oct 31 2008, 12:18 AM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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Lol...How to do it????
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Oct 31 2008, 12:20 AM
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Junior Member
200 posts Joined: Oct 2007
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i dont know.
i cant figure out why the answer is A |
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Oct 31 2008, 12:25 AM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(pwincess @ Oct 31 2008, 12:20 AM) i dont know. Ya...How come get A? Where you get this ques from??i cant figure out why the answer is A |
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Oct 31 2008, 12:27 AM
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Junior Member
200 posts Joined: Oct 2007
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thats why. i get it from pelangi book
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Oct 31 2008, 12:49 AM
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Senior Member
2,379 posts Joined: Dec 2005
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QUOTE(vick5821 @ Oct 30 2008, 08:56 PM) but it said that pressure exerted by mercury onli..not total pressure leh ok...u are right. im not sitting for exam this year. good luck to u |
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Oct 31 2008, 01:55 AM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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I got 7k Pa.
P =hpg =0.7(1000)(10) =7000 Pa How did it get cut down to 6860. Anyone clarify it? |
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Oct 31 2008, 07:41 AM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(HotChocolate @ Oct 31 2008, 01:55 AM) I got 7k Pa. it uses 9.8P =hpg =0.7(1000)(10) =7000 Pa How did it get cut down to 6860. Anyone clarify it? |
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Oct 31 2008, 10:07 AM
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Validating
44 posts Joined: Jul 2008
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guys, tips to study bio ?
i study, but sometimes facts tends to slip off my mind, esp when sucess is so thick |
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Oct 31 2008, 10:18 AM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(purplearch @ Oct 31 2008, 10:07 AM) guys, tips to study bio ? good luck. all these should be done through continuous study+revision.i study, but sometimes facts tends to slip off my mind, esp when sucess is so thick |
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Oct 31 2008, 12:15 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(HotChocolate @ Oct 31 2008, 01:55 AM) I got 7k Pa. It is in volume should use vpg rite??P =hpg =0.7(1000)(10) =7000 Pa How did it get cut down to 6860. Anyone clarify it? |
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Oct 31 2008, 12:41 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(gzavincent @ Oct 31 2008, 12:15 PM) It is in volume should use vpg rite?? Don't know what you ask for ? |
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Oct 31 2008, 01:15 PM
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Senior Member
3,871 posts Joined: May 2008
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hey guys..today so happy ..get back my add math paper..know how many?
Added on October 31, 2008, 1:29 pm QUOTE(HotChocolate @ Oct 30 2008, 11:58 PM) My tuition teacher told us like this: still got..just tis 3?Insoluble Sulphate salt Pb (Lead) - Persatuan Ba (Barium) - Bahasa Ca (Calcium) - Cina Insoluble Chloride salt Pb(Lead) - Persatuan Ag (Silver)- Agama Hg (Mercury) - Hindu All Carbonate are insoluble except Sodium, Potassium, Ammonium Carbonate. This post has been edited by vick5821: Oct 31 2008, 01:53 PM |
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Oct 31 2008, 10:04 PM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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QUOTE(vick5821 @ Oct 31 2008, 01:15 PM) hey guys..today so happy ..get back my add math paper..know how many? how much u got ?Added on October 31, 2008, 1:29 pm still got..just tis 3? |
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Oct 31 2008, 10:46 PM
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Senior Member
3,871 posts Joined: May 2008
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99/100 ...haha..better than my modern math(98)
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Oct 31 2008, 10:59 PM
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Junior Member
267 posts Joined: Dec 2006
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Hey guys ! why edu.joshuatly download link become like this adi ???
pls tell me how to fix it i wan to download them asap Attached thumbnail(s) 
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Oct 31 2008, 11:01 PM
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Senior Member
628 posts Joined: Sep 2008 From: Penang ---- Perth
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must register before u can download all the paper
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Oct 31 2008, 11:02 PM
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Junior Member
267 posts Joined: Dec 2006
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I logged in already but still the same
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Oct 31 2008, 11:03 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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QUOTE(vick5821 @ Oct 31 2008, 10:46 PM) 99/100 ...haha..better than my modern math(98) fuyoh...pro.... |
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Oct 31 2008, 11:04 PM
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Senior Member
3,871 posts Joined: May 2008
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not so..i also ask from u all sometimes
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Oct 31 2008, 11:06 PM
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Senior Member
628 posts Joined: Sep 2008 From: Penang ---- Perth
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no problem in my comp...
Added on October 31, 2008, 11:06 pmwho hav kl trial exam spm paper? This post has been edited by adrian7386: Oct 31 2008, 11:06 PM |
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Nov 1 2008, 11:59 AM
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Senior Member
3,871 posts Joined: May 2008
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got a chem ques here
Which of the following salts can be prepared by the reaction of an acid with a metal.? A Potassium chloride B. Copper (II) sulphate C. Lead (II) iodide D Magnesium nitrate |
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Nov 1 2008, 12:11 PM
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Junior Member
200 posts Joined: Oct 2007
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the answer is D
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Nov 1 2008, 12:14 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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Either A or D.
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Nov 1 2008, 12:21 PM
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Junior Member
200 posts Joined: Oct 2007
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help me with these 2 question.
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Nov 1 2008, 12:23 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(pwincess @ Nov 1 2008, 12:11 PM) the answer is D why D?? the ans is Dp/s..your ques 25 E? 21 D? This post has been edited by vick5821: Nov 1 2008, 12:26 PM |
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Nov 1 2008, 12:25 PM
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Junior Member
41 posts Joined: Sep 2008 From: Land of Hornbill
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QUOTE(vick5821 @ Nov 1 2008, 11:59 AM) got a chem ques here Erm, i think is D, correct?Which of the following salts can be prepared by the reaction of an acid with a metal.? A Potassium chloride B. Copper (II) sulphate C. Lead (II) iodide D Magnesium nitrate because for A, we cant use reactive metal like Potassium to react with acid because explosion will happen. for B, copper metal do not react with acid cos it is located lower than H in ECS. for C, this is insoluble salt, must use double decomposition method(mix soluble salt contain cation and another soluble salt contain anion } for D, Mg can react with nitric acid. please correct me if im wrong. This post has been edited by nicoleycc: Nov 1 2008, 12:27 PM |
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Nov 1 2008, 12:26 PM
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Junior Member
200 posts Joined: Oct 2007
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like work_tgr said, the answer is either A or D.
if A, K + HCL -> KCL +H2 if D, Mg + HNO3 -> Mg(NO3)2 + H2 *both of the equation is not balanced |
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Nov 1 2008, 12:27 PM
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Senior Member
3,871 posts Joined: May 2008
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any metal located below H cant react with acid?
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Nov 1 2008, 12:27 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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1000x50=50000J
333/90=3.7 |
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Nov 1 2008, 12:28 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(work_tgr @ Nov 1 2008, 12:27 PM) 1000x50=50000J not 1600 X 50?333/90=3.7 |
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Nov 1 2008, 12:28 PM
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Junior Member
200 posts Joined: Oct 2007
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yes. bcoz hydrogen is more reactive then the metal that is located below H.
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Nov 1 2008, 12:29 PM
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4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 1 2008, 12:28 PM) not 1600 X 50? It said work to overcome "friction". |
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Nov 1 2008, 12:29 PM
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Senior Member
3,871 posts Joined: May 2008
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yea lo..btw, what is the ans?
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Nov 1 2008, 12:30 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(work_tgr @ Nov 1 2008, 12:27 PM) 1000x50=50000J why 1000x50?333/90=3.7 not 600x50? Added on November 1, 2008, 12:30 pmthe answer is as u stated just now. 25E 21D This post has been edited by pwincess: Nov 1 2008, 12:30 PM |
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Nov 1 2008, 12:32 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(pwincess @ Nov 1 2008, 12:30 PM) why 1000x50? 600x50 is refer to total work donenot 600x50? Added on November 1, 2008, 12:30 pmthe answer is as u stated just now. 25E 21D |
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Nov 1 2008, 12:33 PM
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Senior Member
3,871 posts Joined: May 2008
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25 E..? me correct?
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Nov 1 2008, 12:34 PM
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Junior Member
41 posts Joined: Sep 2008 From: Land of Hornbill
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QUOTE(vick5821 @ Nov 1 2008, 12:27 PM) any metal located below H cant react with acid? yes, for exampleMg + H2SO4 -> MgSO4 + H2 Mg located higher than H, then it can grab or "rampas" the SO4 2- from H while for Cu Cu + H2SO4 -> no reaction Cu is lower than H in ECS, it cant grab or "rampas" the SO4 2- from H. This post has been edited by nicoleycc: Nov 1 2008, 01:43 PM |
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Nov 1 2008, 12:34 PM
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Junior Member
200 posts Joined: Oct 2007
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oh. ic. if it wants total work done then 600x50.
if work done against friction is 1000x50. i understand now. thx |
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Nov 1 2008, 12:35 PM
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Senior Member
3,871 posts Joined: May 2008
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haha..i also think that 25 D le..hehe
Added on November 1, 2008, 12:37 pm1600 x 50 is the total work done rite?? then work done to overcome friction is just take the frictional force x displacement This post has been edited by vick5821: Nov 1 2008, 12:37 PM |
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Nov 1 2008, 12:42 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 1 2008, 12:35 PM) 1600 x 50 is the total work done rite?? It depends on how question defines "total work done". Ya, 1600x50 is better. 600x50 is the work done to rise the wood log. |
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Nov 1 2008, 01:06 PM
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Junior Member
200 posts Joined: Oct 2007
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phy ques..
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Nov 1 2008, 01:21 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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Tension = pvg-mg=(1.25)(1200)(10)-(800)(10)=15000-8000=7000N
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Nov 1 2008, 02:45 PM
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Junior Member
99 posts Joined: Jan 2007
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Hi guys I got a Q I wanna ask, hope u can help
Which of the following pairs of substances is most suitable to prepare copper(II) sulphate salt? A. Copper with dilute sulphuric acid B. Copper(II) chloride with dilute sulphuric acid C. Copper(II) carbonate with dilute sulphuric acid D. Copper(II) nitrate solution with sodium sulphate solution |
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Nov 1 2008, 03:42 PM
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Junior Member
322 posts Joined: May 2008 From: ss19 subang jaya
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i remember success book mentioned all nitrate salts are soluble .
sodium salts are soluble also . so i will choose D |
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Nov 1 2008, 03:53 PM
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Junior Member
130 posts Joined: Dec 2005 From: KL
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QUOTE(DXK @ Nov 1 2008, 02:45 PM) Hi guys I got a Q I wanna ask, hope u can help CuSO4 is soluble salt. D is definitely not possible.. this is no double decompostition reaction. Which of the following pairs of substances is most suitable to prepare copper(II) sulphate salt? A. Copper with dilute sulphuric acid B. Copper(II) chloride with dilute sulphuric acid C. Copper(II) carbonate with dilute sulphuric acid D. Copper(II) nitrate solution with sodium sulphate solution A is not possible because Hydrogen is more reactive than copper metal. I would choose C. to get CuSO4 there are 3 ways. copper oxide with sulphuric acid, copper hydroxide with sulphuric acid or copper carbonate with sulphuric acid. |
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Nov 1 2008, 03:59 PM
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Junior Member
99 posts Joined: Jan 2007
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QUOTE(neorelated4 @ Nov 1 2008, 03:53 PM) CuSO4 is soluble salt. D is definitely not possible.. this is no double decompostition reaction. Yup you are right, answer given is CA is not possible because Hydrogen is more reactive than copper metal. I would choose C. to get CuSO4 there are 3 ways. copper oxide with sulphuric acid, copper hydroxide with sulphuric acid or copper carbonate with sulphuric acid. just wanna try asking here cuz cant find explanation in my books. Thx btw, CluelessNick, its your Bday right? Congratz |
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Nov 1 2008, 06:30 PM
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3,871 posts Joined: May 2008
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QUOTE(neorelated4 @ Nov 1 2008, 03:53 PM) CuSO4 is soluble salt. D is definitely not possible.. this is no double decompostition reaction. how u know D is double decomposition reaction?A is not possible because Hydrogen is more reactive than copper metal. I would choose C. to get CuSO4 there are 3 ways. copper oxide with sulphuric acid, copper hydroxide with sulphuric acid or copper carbonate with sulphuric acid. |
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Nov 1 2008, 06:38 PM
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Junior Member
130 posts Joined: Dec 2005 From: KL
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it's not. if it were then a precipitate would form. double decomposition reaction only occurs when 2 soluble salt solutions are mixed together and an insoluble salt is formed. since cuso42 is soluble, hence no precipitate will form.
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Nov 1 2008, 06:39 PM
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Senior Member
1,287 posts Joined: Feb 2008
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Double decomposition will produce insouble salt.
From D, Cu(NO3)2 + Na2SO4 --> CuSO4 + 2NaNO3 [This reaction is not double decompostion] There is no insoluble salt produced, and we cannot separate the two solution. Thus D is wrong. |
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Nov 1 2008, 06:50 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..double decompostion reaction is two soluble salt mixed toghether
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Nov 1 2008, 06:52 PM
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4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 1 2008, 06:50 PM) oh..double decompostion reaction is two soluble salt mixed toghether yes. right |
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Nov 1 2008, 07:05 PM
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Junior Member
200 posts Joined: Oct 2007
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no 15 pls !
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Nov 1 2008, 07:13 PM
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3,871 posts Joined: May 2008
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one add math ques.. solve the equation 2 + 2log 4 (p-6) = log 2 p
p/s the 4 and 2 are the base |
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Nov 1 2008, 07:18 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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There is 4 way to prepare soluble salt...
But 1 of them is only for SAP salt..Other 3 ways is for other soluble salt.. Added on November 1, 2008, 7:21 pm QUOTE(pwincess @ Nov 1 2008, 07:05 PM) no 15 pls ! Answer is B...At the dotted line there pressure is equal...Meaning that use formula hpg+atm This post has been edited by gzavincent: Nov 1 2008, 07:21 PM |
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Nov 1 2008, 07:27 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(pwincess @ Nov 1 2008, 07:05 PM) no 15 pls ! Pgas =hpg + Patm =0.1(1.36x104)(10) + 1.03 x 105 =1.166 x 105 Pa QUOTE(vick5821 @ Nov 1 2008, 07:13 PM) one add math ques.. solve the equation 2 + 2log 4 (p-6) = log 2 p log2 4 + [(log2 (p-6)2)/(log2 4)]= log2 pp/s the 4 and 2 are the base 4(1/2)((p-6)2) = p 2p2 - 24p - p + 72 = 0 (2p-9)(p-8) = 0 p = 4.5, 8 *edited, pressed calculator wrongly. This post has been edited by HotChocolate: Nov 1 2008, 07:54 PM |
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Nov 1 2008, 07:42 PM
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Senior Member
3,871 posts Joined: May 2008
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not tis ans wor
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Nov 1 2008, 07:57 PM
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Senior Member
823 posts Joined: Apr 2005
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I try..
2 + 2log 4 (p-6) = log 2 p 2 log 4 (p-6) - log 2 p = -2 log 4 (p-6)^2 - log 2 p = 2 [log 2 (p-6)^2 / log 2 2^2] - log 2 p = -2 [log 2 (p-6)^2 / 2] - log 2 p = -2 log 2 (p-6)^2 - 2 log 2 p = -2(2) log 2 (p-6)^2 - log 2 p^2 = -4 log 2 [(p^2 - 12p + 36) / p^2] = -4 (p^2 - 12p + 36) / (p^2)= 2^-4 p^2 - 12p + 36 = (1/16)p^2 (15/16)p^2 - 12p + 36 = 0 p = ... Fixed for errors This post has been edited by Leto Kynes: Nov 1 2008, 08:59 PM |
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Nov 1 2008, 08:28 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 1 2008, 07:13 PM) one add math ques.. solve the equation 2 + 2log 4 (p-6) = log 2 p p/s the 4 and 2 are the base 
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Nov 1 2008, 08:31 PM
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Senior Member
874 posts Joined: Feb 2008
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i heard english paper going to be hard
vick how many a's u got for trials? |
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Nov 1 2008, 08:43 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(wreckens15 @ Nov 1 2008, 08:31 PM) i heard english paper going to be hard vick is only form 4 student.vick how many a's u got for trials? LOL! Don't believe it, right?  |
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Nov 1 2008, 08:45 PM
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Senior Member
2,550 posts Joined: Dec 2006
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He really form 4 student..
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Nov 1 2008, 08:46 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(ff8ong @ Nov 1 2008, 08:45 PM) He really form 4 student.. -- *hehe* - quickly reedit  Good Luck SPM candidates. You only have less than two weeks time for final preparation. This post has been edited by work_tgr: Nov 1 2008, 08:51 PM |
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Nov 1 2008, 08:54 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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QUOTE(Leto Kynes @ Nov 1 2008, 07:57 PM) I try.. i think u made an error there.. u switched '2' over to the right yet but you did not put a negative sign infront of it..2 + 2log 4 (p-6) = log 2 p 2 log 4 (p-6) - log 2 p = 2 log 4 (p-6)^2 - log 2 p = 2 [log 2 (p-6)^2 / log 2 2^2] - log 2 p = 2 [log 2 (p-6)^2 / 2] - log 2 p = 2 log 2 (p-6)^2 - 2 log 2 p = 2(2) log 2 (p-6)^2 - log 2 p^2 = 4 log 2 [(p^2 - 12p + 36) / p^2] = 4 (p^2 - 12p + 36) = 2^4 p^2 - 12p + 36 = 16 p^2 - 12p + 20 = 0 (p - 10) (p - 2) = 0 p = 10, 2 Is this correct?? should have been: 2 log 4 (p-6) - log 2 p = -2 log 4 (p-6)^2 - log 2 p =-2 [log 2 (p-6)^2 / log 2 2^2] - log 2 p = -2 [log 2 (p-6)^2 / 2] - log 2 p = -2 log 2 (p-6)^2 - 2 log 2 p = -2(2) log 2 (p-6)^2 - log 2 p^2 =- 4 log 2 [(p^2 - 12p + 36) / p^2] = -4 (p^2 - 12p + 36) = 2^-4p^2 p^2 - 12p + 36 = 1/16p^2 15/16p^2 - 12p + 36 = 0 p=4.8 , 8 is this right? Added on November 1, 2008, 8:55 pm QUOTE(work_tgr @ Nov 1 2008, 08:46 PM) -- *hehe* - quickly reedit to be a little bit more precise, it's more like 1 weeks to spm.. damn.. Good Luck SPM candidates. You only have less than two weeks time for final preparation. This post has been edited by mych91: Nov 1 2008, 08:55 PM |
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Nov 1 2008, 08:56 PM
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Senior Member
823 posts Joined: Apr 2005
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QUOTE(mych91 @ Nov 1 2008, 08:54 PM) i think u made an error there.. u switched '2' over to the right yet but you did not put a negative sign infront of it.. You're right.. my bad.. made the simplest error should have been: 2 log 4 (p-6) - log 2 p = -2 log 4 (p-6)^2 - log 2 p =-2 [log 2 (p-6)^2 / log 2 2^2] - log 2 p = -2 [log 2 (p-6)^2 / 2] - log 2 p = -2 log 2 (p-6)^2 - 2 log 2 p = -2(2) log 2 (p-6)^2 - log 2 p^2 =- 4 log 2 [(p^2 - 12p + 36) / p^2] = -4 (p^2 - 12p + 36) = 2^-4p^2 p^2 - 12p + 36 = 1/16p^2 15/16p^2 - 12p + 36 = 0 p=4.8 , 8 is this right? Added on November 1, 2008, 8:55 pm to be a little bit more precise, it's more like 1 weeks to spm.. damn.. Hope your answer is right, at least!work_tgr I don't think you can just remove the log like that |
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Nov 1 2008, 08:59 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(Leto Kynes @ Nov 1 2008, 08:56 PM) work_tgr I don't think you can just remove the log like that why not?simple example: x=y log10 (x)= log10 (y) Added on November 1, 2008, 9:01 pm QUOTE(mych91 @ Nov 1 2008, 08:54 PM) to be a little bit more precise, it's more like 1 weeks to spm.. damn.. uhhuuu!! Every body cell is getting excited!This post has been edited by work_tgr: Nov 1 2008, 09:01 PM |
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Nov 1 2008, 09:01 PM
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823 posts Joined: Apr 2005
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QUOTE(work_tgr @ Nov 1 2008, 08:59 PM) why not? oh.. ok simple example: x=y log10 (x)= log10 (y) mych and I got two values for p though =x need vick to post the ans |
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Nov 1 2008, 09:02 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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QUOTE(Leto Kynes @ Nov 1 2008, 08:56 PM) You're right.. my bad.. made the simplest error haha.. yeah hopefully.. Hope your answer is right, at least!work_tgr I don't think you can just remove the log like that what work_tgr did wrong was he/she didnt change the equation from log base 4 to log base 2.otherwise, if all are in log with the same base, it is possible that all logs be canceled out. Added on November 1, 2008, 9:05 pmneeeddd more add math questionss!!.. anyone? This post has been edited by mych91: Nov 1 2008, 09:05 PM |
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Nov 1 2008, 09:10 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(mych91 @ Nov 1 2008, 09:02 PM) haha.. yeah hopefully.. what work_tgr did wrong was he/she didnt change the equation from log base 4 to log base 2.otherwise, if all are in log with the same base, it is possible that all logs be canceled out.  LOL! .. base 2 liao leh -- I know the second step looks "suspicious" to you ... but This post has been edited by work_tgr: Nov 1 2008, 09:12 PM |
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Nov 1 2008, 09:14 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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oh crap.. thousand apologies..
my bad.. yeah you're right.. you DID change to base 2.. cause it gets kinda confusing when u leave out the changing base step man.. why are there so many variations to the answer to dis question |
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Nov 1 2008, 09:48 PM
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Junior Member
267 posts Joined: Dec 2006
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Stress vs music = ?
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Nov 1 2008, 09:52 PM
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Junior Member
200 posts Joined: Oct 2007
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A piece of stone weighing 600 g at 28 degree celcius is put into a beaker which contain 1.2 kg of water at 50 degree celcius. calculate the final temperature of the water and the stone.
(Specific heat capacity=4200, specific heat capacity of stone=840) |
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Nov 1 2008, 10:05 PM
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Senior Member
1,287 posts Joined: Feb 2008
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QUOTE(pwincess @ Nov 1 2008, 09:52 PM) A piece of stone weighing 600 g at 28 degree celcius is put into a beaker which contain 1.2 kg of water at 50 degree celcius. calculate the final temperature of the water and the stone. 0.6(840)(T-28) = 1.2(4200)(50-T)(Specific heat capacity=4200, specific heat capacity of stone=840) 504(T-28) = 5040(50-T) 504T - 14112 = 252000 - 5040T 5544T = 266112 T = 48 Correct me if I'm wrong |
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Nov 1 2008, 10:14 PM
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Junior Member
200 posts Joined: Oct 2007
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ur ans is correct but how did u get 1.2x4200x(50-T)
why not T-50 ? bcoz it asked for the stone final temperature. im confused |
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Nov 1 2008, 10:16 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(pwincess @ Nov 1 2008, 10:14 PM) ur ans is correct but how did u get 1.2x4200x(50-T) because the final temperature must lower than 50 and higher than 28why not T-50 ? bcoz it asked for the stone final temperature. im confused |
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Nov 1 2008, 10:17 PM
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Senior Member
1,287 posts Joined: Feb 2008
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The water will cool down after putting in the stone right? So the final temperature of water should be 50-T because T<50.
As for the stone, its final temperature will increase so T-28 for T>28. [T = final temperature] |
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Nov 1 2008, 10:22 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(tonnect91 @ Nov 1 2008, 10:17 PM) The water will cool down after putting in the stone right? So the final temperature of water should be 50-T because T<50. ohh.the water will cool the stone, so thats why its final temperature is T>28. i get it now. thank u ! As for the stone, its final temperature will increase so T-28 for T>28. [T = final temperature]  |
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Nov 1 2008, 10:24 PM
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Senior Member
1,287 posts Joined: Feb 2008
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Not water cool the stone. When they achieved thermal equilibrium, their temperature will be same right? Imagine you put ice into hot water, the ice melts and the water cool. Water cool down BECAUSE of ice.
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Nov 1 2008, 10:29 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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Thermal equilibrium is the best word.the higher temp will reduce while the lower one will increase..
Q=tita...duno hw to type so mcQ=mcQ mc(50-T)=mc(T-28) i didnt raed the question but i think is lik this... |
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Nov 1 2008, 10:56 PM
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Senior Member
3,871 posts Joined: May 2008
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the ans for the add math ques is just 8
Added on November 1, 2008, 10:59 pm QUOTE(wreckens15 @ Nov 1 2008, 08:31 PM) i heard english paper going to be hard i am just form 4 la weivick how many a's u got for trials? This post has been edited by vick5821: Nov 1 2008, 10:59 PM |
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Nov 1 2008, 11:07 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 1 2008, 10:56 PM) the ans for the add math ques is just 8 haha I'm right  |
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Nov 1 2008, 11:14 PM
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Senior Member
3,871 posts Joined: May 2008
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but why i can get 4.8 and 8?
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Nov 1 2008, 11:15 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 1 2008, 11:14 PM) but why i can get 4.8 and 8? show your steps |
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Nov 1 2008, 11:20 PM
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Senior Member
3,871 posts Joined: May 2008
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just like others forumer
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Nov 1 2008, 11:25 PM
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Junior Member
44 posts Joined: Apr 2008
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anyone from mara here?? pm me.. I NEED YOU!!
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Nov 2 2008, 12:05 AM
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Senior Member
2,550 posts Joined: Dec 2006
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Wow,you also trust Mara ah?everyone is talking about MARA now..
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Nov 2 2008, 12:05 AM
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823 posts Joined: Apr 2005
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QUOTE(work_tgr @ Nov 1 2008, 11:07 PM) haha oops I'm right hahavick can ask your add math teacher what we did wrong? |
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Nov 2 2008, 12:30 AM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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QUOTE(Leto Kynes @ Nov 2 2008, 12:05 AM) oops Hmm...I tried substituting p = 4.8 into the equation. Somehow it's also correct. hahavick can ask your add math teacher what we did wrong? You will get 2.2630... = 2.2630... p = 8 is also correct: LHS = 3 and RHS = 3 too. Possibly both 4.8 and 8 are correct? |
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Nov 2 2008, 12:33 AM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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what about mara.
why suddenly the topic about mara? |
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Nov 2 2008, 12:36 AM
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Junior Member
267 posts Joined: Dec 2006
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Guys pls help me math question
i know i should draw -8 at y axis but what about 3 over 2 x ??where should i draw i don understand this answer - - Attached thumbnail(s) 
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Nov 2 2008, 12:39 AM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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QUOTE(skzisghost @ Nov 2 2008, 12:36 AM) Guys pls help me math question There will be an x-intersect at -16/3. The graph didn't show the x-intersect (maybe not enough space?)i know i should draw -8 at y axis but what about 3 over 2 x ??where should i draw i don understand this answer - - |
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Nov 2 2008, 12:39 AM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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erm, the straight line you have to draw is actually,
y=-3/2x-8 where -3/2 is m and -8 is the c follow the equation y=mx+c |
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Nov 2 2008, 12:40 AM
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2,550 posts Joined: Dec 2006
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QUOTE(skzisghost @ Nov 2 2008, 12:36 AM) Guys pls help me math question Nonono,it is not the way to do it..i know i should draw -8 at y axis but what about 3 over 2 x ??where should i draw i don understand this answer - - you have to make a range box first like X=-2 and X=4 fill in the both x into the equation y=-8-3/2 x and find the y...then dot it and draw straight line loh.. Hard to explain here.. |
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Nov 2 2008, 12:43 AM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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You can also just find two coordinates to draw a straight line.
You know that when x = 0, y = -8. (0,-8) Now lets say when x = 2, y = ?. You should get -11. So, (2,-11). Draw a straight line connecting these two points and you're done. (A range box method is also suitable, as stated by ff8ong.) |
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Nov 2 2008, 12:52 AM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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is there a good website where i can find like plans/elevation for various geometric shape? im looking at f5 maths chapter 10.
whats a good term i can search for, in yahoo. after searching like 20minutes i still cant find what i wanted |
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Nov 2 2008, 12:52 AM
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Senior Member
2,550 posts Joined: Dec 2006
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My only math problem is Paper 2 section A speed time graph...not good on that...
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Nov 2 2008, 12:56 AM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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why ya?
just remember physics. if you take area under a speed-time graph, you get distance travelled. if you take gradient of a distance-time graph, you get speed. speed=distance/time distance = speed x time play ardount with the formula =) |
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Nov 2 2008, 03:10 AM
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Senior Member
3,186 posts Joined: Jan 2008
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about the MARA thing,y is it so popular now?
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Nov 2 2008, 09:07 AM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 1 2008, 07:13 PM) one add math ques.. solve the equation 2 + 2log 4 (p-6) = log 2 p log2(4) + [log2 (p-6)^2]/log2(4) = log 2 (p)p/s the 4 and 2 are the base 4+log2 (p-6)^2=2log2(p) 2^4*(p-6)^2=p^2 16(p^2-12p+36)=p^2 15p^2-192p+576=0 p=8 @ 4.8 if p=4.8 2log 4 (p-6) =2log4(-1.2) log4(-1.2) is infinity. that why p=4.8 is not acceptable. This post has been edited by work_tgr: Nov 2 2008, 09:07 AM |
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Nov 2 2008, 09:21 AM
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Senior Member
1,606 posts Joined: Oct 2007 From: Emirates Stadium ~
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QUOTE(ff8ong @ Nov 2 2008, 12:52 AM) My only math problem is Paper 2 section A speed time graph...not good on that... my math problem is paper 2 section B Earth as a sphere |
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Nov 2 2008, 09:31 AM
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Senior Member
823 posts Joined: Apr 2005
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QUOTE(work_tgr @ Nov 2 2008, 09:07 AM) log2(4) + [log2 (p-6)^2]/log2(4) = log 2 (p) Thanks for clarifying that up 4+log2 (p-6)^2=2log2(p) 2^4*(p-6)^2=p^2 16(p^2-12p+36)=p^2 15p^2-192p+576=0 p=8 @ 4.8 if p=4.8 2log 4 (p-6) =2log4(-1.2) log4(-1.2) is infinity. that why p=4.8 is not acceptable. |
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Nov 2 2008, 10:25 AM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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dont worry bout the chapter earth as a sphere.. if u think u aint good at it,simple!.. dont choose that question..
its in section b where u are only asked to do 4/5 questions.. |
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Nov 2 2008, 10:35 AM
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Senior Member
2,550 posts Joined: Dec 2006
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For me depend on questions,i plan to do all 5 questions if able lah..always draw the sphere then list all the coordinate then only start to do..buy watch so no need to at the hall clock..it waste a lot of time....
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Nov 2 2008, 10:44 AM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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yeah.. time will be the greatest enemy when in the exam hall..
scarryy~~ |
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Nov 2 2008, 10:54 AM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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There should be enough time to complete your paper for SPM.
I managed to leave at least 20 minutes early for 90% of the papers (with the exception of Paper 1's). On the other hand..., 3 hours is already not enough for me in Pre-U. Lost 18 marks in 2 questions. Had to skip it due to lack of time. |
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Nov 2 2008, 10:58 AM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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i got a problem in drawing like, plans & elevation for things like cylinder from the side view =/
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Nov 2 2008, 11:05 AM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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Cylinders will look like rectangles from most point of views (with the exception of the hemisphere). Cones will look like triangles from a side view, circles when viewed from the top.
I forgot the technique to draw the plan when viewed from one of the corners though... =P |
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Nov 2 2008, 11:21 AM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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how does the hemisphere look like from side view ya ?
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Nov 2 2008, 11:23 AM
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Senior Member
2,550 posts Joined: Dec 2006
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QUOTE(Shenay @ Nov 2 2008, 11:21 AM) how does the hemisphere look like from side view ya ? Half circle loh.. |
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Nov 2 2008, 11:25 AM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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hmm what other shapes can they put at the side ah..
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Nov 2 2008, 11:31 AM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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Spheres, cones, cylinders, prisms, cuboids, pyramids.
Basically a combination of the above. There may be some hollowed-parts too (e.g. a cuboid with a hole in the middle, draw dotted lines to indicate this). |
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Nov 2 2008, 12:54 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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heh okie let me go practice =) thanks nick!
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Nov 2 2008, 02:51 PM
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Junior Member
267 posts Joined: Dec 2006
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QUOTE(ff8ong @ Nov 2 2008, 12:40 AM) Nonono,it is not the way to do it.. after few hour of research i finally figure out how to solve it thank guysyou have to make a range box first like X=-2 and X=4 fill in the both x into the equation y=-8-3/2 x and find the y...then dot it and draw straight line loh.. Hard to explain here.. This post has been edited by skzisghost: Nov 2 2008, 03:07 PM |
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Nov 2 2008, 04:35 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(Shenay @ Nov 2 2008, 10:58 AM) i got a problem in drawing like, plans & elevation for things like cylinder from the side view =/ You better master this..It's free point..In math i wont choose earth as sphere..I confuse when teacher teach... |
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Nov 2 2008, 05:41 PM
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Senior Member
874 posts Joined: Feb 2008
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wakau vick form 4 oeldi so worried
enjoy ur life la study so hard for what leh =_= just spm meh i know im giving bad example XD |
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Nov 2 2008, 05:47 PM
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Senior Member
3,871 posts Joined: May 2008
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hey..i wan to become top la..
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Nov 2 2008, 05:52 PM
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Senior Member
874 posts Joined: Feb 2008
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wahh..
u should enjoy ur teen life later become boring person study study study |
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Nov 2 2008, 05:57 PM
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Senior Member
3,871 posts Joined: May 2008
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never..i enjoying study
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Nov 2 2008, 05:58 PM
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Junior Member
503 posts Joined: Sep 2006 From: Land below the wind
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during chemistry spm wat is provided ah? only periodic table?
electrochemical series got? its hell too memorised all that huhu.. |
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Nov 2 2008, 06:06 PM
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Senior Member
3,871 posts Joined: May 2008
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i think periodic table given..but the ECS mayb no
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Nov 2 2008, 06:07 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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Periodic table only.
Do you think life's that easy? It's not Add Maths / Modern Maths / Physics |
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Nov 2 2008, 06:08 PM
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Senior Member
3,871 posts Joined: May 2008
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i wan MARA add math paper 1 ans..anyone have?? pls PM me
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Nov 2 2008, 06:15 PM
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Junior Member
503 posts Joined: Sep 2006 From: Land below the wind
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oic..yeah lol..life's not easy..success needs hardwork..
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Nov 2 2008, 06:19 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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Periodic table also depends...Not neccesary it given...
Added on November 2, 2008, 6:21 pm QUOTE(vick5821 @ Nov 2 2008, 05:47 PM) hey..i wan to become top la.. Actually top in malaysia is useless la..Even those straight A's ppl went to oversea still fail physics... They even cant answer the simple ques given.. This post has been edited by gzavincent: Nov 2 2008, 06:22 PM |
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Nov 2 2008, 06:23 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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Vick, I just pm-ed you.
If you see this, pls reply fast. I'm going off soon. I'm pretty sure they provide. But, anyone can confirm this? Cause I didn't buy the past year's SPM. Just in case, memorize these stuff: 1)First 20 elements 2)gp 1 3)gp 17 4)gp 18 5)period 3 |
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Nov 2 2008, 06:26 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(gzavincent @ Nov 2 2008, 06:19 PM) Periodic table also depends...Not neccesary it given... i study for knowledgeAdded on November 2, 2008, 6:21 pm Actually top in malaysia is useless la.. Even those straight A's ppl went to oversea still fail physics... They even cant answer the simple ques given.. |
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Nov 2 2008, 06:32 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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Honestly, I nvr be the top student at school. But, my opinion about the purpose of study should lay on getting a related job in the future. Some how, it's hard.
This post has been edited by work_tgr: Nov 2 2008, 06:37 PM |
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Nov 2 2008, 06:39 PM
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Senior Member
3,871 posts Joined: May 2008
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agree with work_tgr
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Nov 2 2008, 06:42 PM
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Senior Member
964 posts Joined: Dec 2005 From: Ipoh!
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Studying is fun though, especially when you successfully master a certain subject, =D
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Nov 2 2008, 06:44 PM
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Senior Member
3,871 posts Joined: May 2008
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yaya..haha..so i dun like eng and bc..
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Nov 2 2008, 06:46 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Nov 2 2008, 06:26 PM) i study for knowledge Ya for knowledge is right..Buy u noe alot of our syllabus are wrong?? |
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Nov 2 2008, 06:56 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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wrong? in what way?
oh u noe what? i'm just studying because its a requirement.. when we get into the work force, most of wat we study in school will just be irrelevant to whatever we're doing.. |
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Nov 2 2008, 07:00 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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Agree, especially with our syllabus.
Lack of practical and applications. |
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Nov 2 2008, 07:02 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(mych91 @ Nov 2 2008, 06:56 PM) wrong? in what way? I also study for requirement...Because all are useless in our work..oh u noe what? i'm just studying because its a requirement.. when we get into the work force, most of wat we study in school will just be irrelevant to whatever we're doing.. Mayb some got...Alot are wrong..Like all the scientific name..Some theory are also wrong.. My teacher told me that..Gouvernment wan make it easier so chg it.. Added on November 2, 2008, 7:05 pm QUOTE(HotChocolate @ Nov 2 2008, 07:00 PM) Agree, especially with our syllabus. Ya right...Last time syllabus are all right..Lack of practical and applications. Now we do paper 3 because wan let us understand the experiment.. But we never did it before how we understand?? Even peka teacher just ask us to copy from book? Last time 90's they dun have paper 3..They have to do practical which is usefull.. This post has been edited by gzavincent: Nov 2 2008, 07:05 PM |
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Nov 2 2008, 07:05 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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yeah.. our syllabus has been trimmed down to make it easier for us.. in a way, it's good for us .. but on the other side, we'll suffer later on in life when we dont get on par wif students overseas.. oh well..
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Nov 2 2008, 07:12 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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QUOTE(mych91 @ Nov 2 2008, 06:56 PM) wrong? in what way? totally agree with u.oh u noe what? i'm just studying because its a requirement.. when we get into the work force, most of wat we study in school will just be irrelevant to whatever we're doing.. cmon man, some people pass exam because they memorize facts. when they enter the real world, totally dont know how to work |
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Nov 2 2008, 07:19 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(mych91 @ Nov 2 2008, 07:05 PM) yeah.. our syllabus has been trimmed down to make it easier for us.. in a way, it's good for us .. but on the other side, we'll suffer later on in life when we dont get on par wif students overseas.. oh well.. Ya agree...It's only good for us NOW..When we enter oversea university, we hardly to catch up... |
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Nov 2 2008, 08:31 PM
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Senior Member
874 posts Joined: Feb 2008
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education is good
but as u grow up u ll see u missed alot of things u didnt do in ur teen age i admit spm's syllabus is not that difficult probbly it will bring problems later in further studies if we can triumph against a drastic changes from form 3 to form 4 level of education i dont think its a problem to adapt U lvl of education im glad that studying in malaysia didnt bring much tense since im a human not a reading robot just my 2cent |
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Nov 2 2008, 08:34 PM
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Validating
44 posts Joined: Jul 2008
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guys, anyone got sejarah trials spm 2008 kelantan (pkpsm)
please please pm me. been looking all over for it. thanks, all the best! (: |
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Nov 2 2008, 08:39 PM
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Senior Member
874 posts Joined: Feb 2008
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ya i heard kelantan spot this year for trial coming out on spm
heck i hate dasar pertanian and wawasan 2020 those memorising subject bio bm sej gimme a2 only seriously im nt going for law and heck medic with those gila competitive |
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Nov 2 2008, 08:56 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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Guys...Any forecast for BIO???
So worry bout BIO... |
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Nov 2 2008, 09:35 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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QUOTE(wreckens15 @ Nov 2 2008, 08:39 PM) ya i heard kelantan spot this year for trial coming out on spm What kind of rumour is this? heck i hate dasar pertanian and wawasan 2020 those memorising subject bio bm sej gimme a2 only seriously im nt going for law and heck medic with those gila competitive Those chapters are filled with exaggerated positiveness of our country, which makes me very hard. |
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Nov 2 2008, 10:29 PM
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Senior Member
823 posts Joined: Apr 2005
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In the middle of add maths homework.. suddenly forgot what f'(x) means
Left my notes at school, can someone remind me? |
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Nov 2 2008, 10:39 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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differentiation
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Nov 2 2008, 10:50 PM
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Senior Member
823 posts Joined: Apr 2005
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QUOTE(HotChocolate @ Nov 2 2008, 10:39 PM) differentiation Great, thanks! Can't imagine how I forgot  |
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Nov 2 2008, 10:51 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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sejarah ~ killing me
Added on November 2, 2008, 10:53 pm(x-1)^2 / (3-2x)^2 . how do you intergrate this ya? This post has been edited by Shenay: Nov 2 2008, 10:53 PM |
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Nov 2 2008, 10:57 PM
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Senior Member
964 posts Joined: Dec 2005 From: Ipoh!
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(x-1)^2 / (3-2x)^2
u = (x-1)^2 v = (3-2x)^2 du/dx = dv/dx = (v du/dx times u dv/dx) over v^2 |
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Nov 2 2008, 10:58 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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intergrate ah, not differentiate x)
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Nov 2 2008, 11:04 PM
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Senior Member
3,871 posts Joined: May 2008
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what is the ans ya?
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Nov 2 2008, 11:06 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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vick, its something my friend asked me, from her homework.
and i cant figure it out. but its ok la, not in ur syllabus yet |
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Nov 2 2008, 11:08 PM
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Senior Member
3,871 posts Joined: May 2008
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but i study d.
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Nov 2 2008, 11:09 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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okie, so how do u do it ?
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Nov 2 2008, 11:10 PM
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Senior Member
964 posts Joined: Dec 2005 From: Ipoh!
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Try seperate them,
//= intergrate //(x-1)^2 divide by //(3-2x)^2 remember the coeficient |
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Nov 2 2008, 11:11 PM
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Senior Member
3,871 posts Joined: May 2008
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i not sure la..just learnt
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Nov 2 2008, 11:13 PM
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Senior Member
964 posts Joined: Dec 2005 From: Ipoh!
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Your friend pretty anot? If pretty then I'll try my best lol.
Worst case scenario, Expand the top equation, then seperate them and start intergrating P.s: My top method is wrong, I think. Best is do by the 2nd method. This post has been edited by SticH: Nov 2 2008, 11:14 PM |
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Nov 2 2008, 11:15 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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i post up the solution, you explain alright x)
sorry arh, the question abit different. step 2 i dont understand. Attached image(s)  |
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Nov 2 2008, 11:17 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(SticH @ Nov 2 2008, 11:13 PM) Your friend pretty anot? If pretty then I'll try my best lol. Intergration must expand it wad..Worst case scenario, Expand the top equation, then seperate them and start intergrating P.s: My top method is wrong, I think. Best is do by the 2nd method. U dun expand cant do.. |
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Nov 2 2008, 11:46 PM
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Senior Member
823 posts Joined: Apr 2005
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nvm
This post has been edited by Leto Kynes: Nov 2 2008, 11:50 PM |
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Nov 2 2008, 11:50 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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This is the integration I've been wanting to know how to do.
Any experts? |
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Nov 3 2008, 12:03 AM
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Senior Member
1,232 posts Joined: Dec 2005
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OMG! I had a bad time typing equations in microsoft word... just so mafan and hard to type. Someone guide me with it!
Anyways, I hope the solution below is correct. PS: Your recent posted image is not the same as the one you give initially. The 2nd one is definite integration... this one is indefinite. Added on November 3, 2008, 12:37 am@Shenay, I'm not getting the same answer as the solution posted btw... for step 2 I get: 2 [ (x^2 - x^3) / ( 3(1-3x) ) ] Added on November 3, 2008, 12:45 am QUOTE(gzavincent @ Nov 2 2008, 11:17 PM) Intergration must expand it wad.. Not necessary, if the equation is up to a power of 3 and more how are you going to expand? It's going to be a hella long to do that.U dun expand cant do.. there is a formula for this particular case. This post has been edited by Zepx: Nov 3 2008, 12:45 AM Attached thumbnail(s) 
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Nov 3 2008, 12:49 AM
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Senior Member
1,404 posts Joined: Feb 2006 From: KL
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QUOTE(Shenay @ Nov 2 2008, 10:51 PM) sejarah ~ killing me Try expanding it first then only integrate.Added on November 2, 2008, 10:53 pm(x-1)^2 / (3-2x)^2 . how do you intergrate this ya? Added on November 3, 2008, 12:54 am QUOTE(Zepx @ Nov 3 2008, 12:03 AM) OMG! I had a bad time typing equations in microsoft word... just so mafan and hard to type. Someone guide me with it! Didn't know you could do that. So you treat the stuff in the bracket as one whole term?Anyways, I hope the solution below is correct. PS: Your recent posted image is not the same as the one you give initially. The 2nd one is definite integration... this one is indefinite. Added on November 3, 2008, 12:37 am@Shenay, I'm not getting the same answer as the solution posted btw... for step 2 I get: 2 [ (x^2 - x^3) / ( 3(1-3x) ) ] Added on November 3, 2008, 12:45 am Not necessary, if the equation is up to a power of 3 and more how are you going to expand? It's going to be a hella long to do that. there is a formula for this particular case. This post has been edited by raptor_cZn: Nov 3 2008, 12:54 AM |
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Nov 3 2008, 01:37 AM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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» Click to show Spoiler - click again to hide... « I don't think you can do that Lets say integrate 2x-3x2 Your method 2x-3x2 = x(2-3x) = (x2/2)(2x- 3x2/2) = x3 - 3x4/4 Correct method 2x-3x2 = x2 - x3 |
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Nov 3 2008, 06:52 AM
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Senior Member
1,232 posts Joined: Dec 2005
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QUOTE(HotChocolate @ Nov 3 2008, 01:37 AM) » Click to show Spoiler - click again to hide... « I don't think you can do that Lets say integrate 2x-3x2 Your method 2x-3x2 = x(2-3x) = (x2/2)(2x- 3x2/2) = x3 - 3x4/4 Correct method 2x-3x2 = x2 - x3 instead i get x2 - x3 You can directly integrate the x2 - x3 and no, you cannot remove x as a common factor. why? because you are integrating dx. if you do that, meaning x is take out of the integration, in the end, you still have x. ------------- raptor_cZn, You can try expanding the equation and then integrate it. It comes to the same as mine. And yes, it's under our syllabus to take the whole bracket as one whole thing and integrate it. Alternatively, you represent 1-3x = u 1/u2 or something like tat. Added on November 3, 2008, 6:56 amOh ya, to add, for thins like (3-1x)3 there is a formula for this. (ax-b)n+1 / (dy(ax-b)/dx * n+1) Meaning, I should get: (3-1x)4/(-1 * 4) (3-1x)4/-4 Please check your book in reference to this. I'm not using anything out of syllabus. This post has been edited by Zepx: Nov 3 2008, 06:56 AM |
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Nov 3 2008, 07:46 AM
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Senior Member
874 posts Joined: Feb 2008
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why need to factorise to make ur life harder leh =_=
just intergrate the simple equation? i think hot choc get it right |
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Nov 3 2008, 11:17 AM
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Senior Member
1,232 posts Joined: Dec 2005
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Zzz.... please read my equations closely. Since when did I factorise the x out? I'm doing the normal way.
Either way, from my friends, point of view, there is no solution for this equation. It is not possible to integrate as the combination of nominator and denominator especially when the denominator is powered by 2. |
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Nov 3 2008, 11:49 AM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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What I meant was, you seperated it out.
So, I did the same with another example. Your Solution (2x-3x2)/(1-3x)2 = (2x-3x2)(1-3x)-2 (Here you make it into multiply) = (x2-x3)[(1-3x)-1/3] (Here you differentiated separately.) My example 2x-3x2 = x(2-3x) (Here I factorise it, also means i make it into multiply) = (x2/2)(2x- 3x2/2) (Here I differentiated separately) = x3 - 3x4/4 (Here my answer is wrong.) |
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Nov 3 2008, 01:17 PM
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Junior Member
200 posts Joined: Oct 2007
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got admaths question that needs to be solved.
The velocity, v of a particle which moves along a straight line, t seconds after passing a fixed point O, is given by v=10t-3t2+8. Find the interval from the instant the particle starts until it is instantaneously at rest. |
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Nov 3 2008, 01:55 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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pwincess, is the answer 4s ?
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Nov 3 2008, 02:04 PM
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Junior Member
200 posts Joined: Oct 2007
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yep. how did u do it?
can u show the calculation ? |
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Nov 3 2008, 02:07 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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okie you see ya, when there's this word, "instantaneously at rest" means v=0. cause at rest velocity is zero. take the V equation, and equate it to zero.
v= 10t-3t2+8 = 0, and then factorize and get two answers. you will get -3/2 and 4. since its time, so yeah the first answer is not accepted =) |
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Nov 3 2008, 02:17 PM
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Junior Member
200 posts Joined: Oct 2007
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i c. thx for the explaination ! ;D
Added on November 3, 2008, 2:29 pmbtw, how to score high marks on bm and english essay ? This post has been edited by pwincess: Nov 3 2008, 02:29 PM |
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Nov 3 2008, 02:36 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(Shenay @ Nov 2 2008, 11:15 PM) i post up the solution, you explain alright x) I suspect there is a proving question on differentiation before doing this integration. Or else, straight-away integration for this expression is beyond SPM level.sorry arh, the question abit different. step 2 i dont understand. Mind posting the proving question? It helps a lot for this question. |
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Nov 3 2008, 02:42 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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haha ken, yes i got it already ><
its a proving question. but i was just wondering is there, a way to intergrate without proving =) |
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Nov 3 2008, 02:47 PM
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Junior Member
95 posts Joined: Oct 2008
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Hello
i just want to ask is there any way to intergrate this?? 3x²+2x+15 -------------- (1+3x)² |
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Nov 3 2008, 03:11 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(Shenay @ Nov 3 2008, 02:42 PM) haha ken, yes i got it already >< I have literally banged my head on this. The expression is integratable, only with technique beyond SPM. Even so, the upper and lower limits cannot fit into the integration. its a proving question. but i was just wondering is there, a way to intergrate without proving =) In short, no straight-away integration for this question. QUOTE(Jojos @ Nov 3 2008, 02:47 PM) Hello Feel the horror of mathematics! MUAHAHAHAHAi just want to ask is there any way to intergrate this?? 3x²+2x+15 -------------- (1+3x)² It's beyond SPM level. |
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Nov 3 2008, 03:14 PM
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Senior Member
546 posts Joined: Nov 2007 From: Home
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omigosh sorry ken x((
dont be angry |
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Nov 3 2008, 03:15 PM
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Senior Member
1,404 posts Joined: Feb 2006 From: KL
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QUOTE(IamjustME @ Nov 3 2008, 03:11 PM) I have literally banged my head on this. The expression is integratable, only with technique beyond SPM. Even so, the upper and lower limits cannot fit into the integration. What? Like A-Levels maths?In short, no straight-away integration for this question. Feel the horror of mathematics! MUAHAHAHAHA It's beyond SPM level. |
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Nov 3 2008, 03:41 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(Jojos @ Nov 3 2008, 02:47 PM) Hello what is the ans? x^3 - x^2 - 15x / ( -3 - 9x)?i just want to ask is there any way to intergrate this?? 3x²+2x+15 -------------- (1+3x)² This post has been edited by vick5821: Nov 3 2008, 03:43 PM |
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Nov 3 2008, 03:46 PM
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Junior Member
95 posts Joined: Oct 2008
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answer is
x²-5 ------- 1+3x |
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Nov 3 2008, 03:47 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(raptor_cZn @ Nov 3 2008, 03:15 PM) What? Like A-Levels maths? Yup.It's actually at Foundation/A-level/STPM levels. This post has been edited by IamjustME: Nov 3 2008, 04:03 PM |
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Nov 3 2008, 03:54 PM
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Senior Member
964 posts Joined: Dec 2005 From: Ipoh!
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You can integrate them
3x²+2x+15 -------------- (1+3x)² // = integrate seperate them [//3x^2 / (1+3x)²] + [//2x / (1+3x)²] + [//15 / (1+3x)²] |
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Nov 3 2008, 04:04 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(SticH @ Nov 3 2008, 03:54 PM) You can integrate them The problem lies beyond this.3x²+2x+15 -------------- (1+3x)² // = integrate seperate them [//3x^2 / (1+3x)²] + [//2x / (1+3x)²] + [//15 / (1+3x)²] |
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Nov 3 2008, 04:10 PM
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Junior Member
95 posts Joined: Oct 2008
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yea cant intergrate
3x² --------- (1+3x)² and 2x ------- (1+3x)² This post has been edited by Jojos: Nov 3 2008, 04:12 PM |
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Nov 3 2008, 04:17 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(pwincess @ Nov 3 2008, 02:17 PM) i c. thx for the explaination ! ;D Actually there is no real skema for examiner to mark our paper..Added on November 3, 2008, 2:29 pmbtw, how to score high marks on bm and english essay ? What to do is just write what you know and put in peribahasa all those thing.. |
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Nov 3 2008, 04:27 PM
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Junior Member
95 posts Joined: Oct 2008
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Well these are some points i take note
For bm the 2nd essay -write very long -about 500-700 words -put in at least 1 peribahasa For eng -dont need to be long |
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Nov 3 2008, 04:31 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(Jojos @ Nov 3 2008, 04:27 PM) Well these are some points i take note 1 peribahasa is enough to pass..If wan really good result better put in 4 if possible..For bm the 2nd essay -write very long -about 500-700 words -put in at least 1 peribahasa For eng -dont need to be long Remember dun count words..Write 3~4 page for BM.. Eng write it 2~3 page... |
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Nov 3 2008, 04:32 PM
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Junior Member
111 posts Joined: Oct 2006
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errm. form 5 sejarah chapter 7 is it important? i studied but didnt absorb anything.cos it's tooooo boring. ):
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Nov 3 2008, 04:51 PM
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Senior Member
1,232 posts Joined: Dec 2005
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QUOTE(SticH @ Nov 3 2008, 03:54 PM) You can integrate them Nope, can't integrate anything like tat. No formula for SPM level 3x²+2x+15 -------------- (1+3x)² // = integrate seperate them [//3x^2 / (1+3x)²] + [//2x / (1+3x)²] + [//15 / (1+3x)²] |
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Nov 3 2008, 04:53 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(gzavincent @ Nov 3 2008, 04:31 PM) 1 peribahasa is enough to pass..If wan really good result better put in 4 if possible.. oh. ok.Remember dun count words..Write 3~4 page for BM.. Eng write it 2~3 page... for the komsas, if the marks given is 7 then have to write 2 isi ? the marks for bahasa is 3 rite? |
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Nov 3 2008, 04:58 PM
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Senior Member
1,404 posts Joined: Feb 2006 From: KL
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QUOTE(pwincess @ Nov 3 2008, 04:53 PM) oh. ok. You mean the novel question? Yup, 2 points for part a ques. 3 points for the other one.for the komsas, if the marks given is 7 then have to write 2 isi ? the marks for bahasa is 3 rite? But what I don't like is that if they ask stupid questions like the Selangor trials paper. Something to do with kesesuaian permulaan cerita. |
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Nov 3 2008, 05:12 PM
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Junior Member
200 posts Joined: Oct 2007
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i took the selangor trial ppr.
but it dont ask for kesesuiaian prmulaan cerita. it asks for 1 watak sampingan and the other one is latar masyarakat. but every daerah in selangor took different trial ppr. i took ppd trial ppr which is in hulu langat only. so maybe the question kesesuiaian prmulaan cerita is for other daerah. |
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Nov 3 2008, 05:19 PM
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Senior Member
526 posts Joined: Apr 2007 From: Ampang
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QUOTE(pwincess @ Nov 3 2008, 05:12 PM) i took the selangor trial ppr. Same here but dont worry this year mostly simple question willl be questioned in SPM paper like perbandingan watak,watak sampingan,latar masyarakat,latar tempat,plot.but it dont ask for kesesuiaian prmulaan cerita. it asks for 1 watak sampingan and the other one is latar masyarakat. but every daerah in selangor took different trial ppr. i took ppd trial ppr which is in hulu langat only. so maybe the question kesesuiaian prmulaan cerita is for other daerah. |
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Nov 3 2008, 05:31 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(Jojos @ Nov 3 2008, 03:46 PM) answer is how to do?x²-5 ------- 1+3x |
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Nov 3 2008, 05:35 PM
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Junior Member
200 posts Joined: Oct 2007
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QUOTE(irkuysm @ Nov 3 2008, 05:19 PM) Same here but dont worry this year mostly simple question willl be questioned in SPM paper like perbandingan watak,watak sampingan,latar masyarakat,latar tempat,plot. hope so but im scared ! |
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Nov 3 2008, 05:37 PM
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Senior Member
3,871 posts Joined: May 2008
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to prepare a insoluble salt mix two soluble salt together
tis is known as double decomposition method? got others method to prepare insoluble salt? |
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Nov 3 2008, 05:38 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(irkuysm @ Nov 3 2008, 05:19 PM) Same here but dont worry this year mostly simple question willl be questioned in SPM paper like perbandingan watak,watak sampingan,latar masyarakat,latar tempat,plot. "Simple? "During examination, "Simple? "Pray that it would not come out this year. This post has been edited by IamjustME: Nov 3 2008, 05:41 PM |
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Nov 3 2008, 05:39 PM
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Junior Member
200 posts Joined: Oct 2007
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no. got this method only.
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Nov 3 2008, 05:43 PM
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Senior Member
3,871 posts Joined: May 2008
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so mix two soluble salt toghether?? cant one soluble salt mix with one insoluble salt?
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Nov 3 2008, 05:46 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(vick5821 @ Nov 3 2008, 05:43 PM) so mix two soluble salt toghether?? cant one soluble salt mix with one insoluble salt? lol?It fails the purpose to mix insoluble salt with something else. |
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Nov 3 2008, 05:52 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..understood..today my school teacher one day gao dim chap 8
Added on November 3, 2008, 6:03 pmerm..abt physics..what is mean by virtual? This post has been edited by vick5821: Nov 3 2008, 06:03 PM |
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Nov 3 2008, 06:10 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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virtual image is the image that you cannot capture on screen..
i hope im answwering ur question.. ure talking bout the chapter light ritte? |
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Nov 3 2008, 06:12 PM
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Senior Member
3,871 posts Joined: May 2008
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can give me example? ya..i am talking light chap
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Nov 3 2008, 06:16 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 3 2008, 06:12 PM) can give me example? ya..i am talking light chap your image in the mirror is virtual. it can not walk out and you can not go in.but the image which you can "take it out" and focus on screen is real. This post has been edited by work_tgr: Nov 3 2008, 06:17 PM |
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Nov 3 2008, 06:18 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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example would be the image of a light bulb on a mirror..
u cant capture it on a screen can you.. |
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Nov 3 2008, 06:19 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(irkuysm @ Nov 3 2008, 05:19 PM) Same here but dont worry this year mostly simple question willl be questioned in SPM paper like perbandingan watak,watak sampingan,latar masyarakat,latar tempat,plot. You don't worry bout teknik plot??Teknik plot and plot are different u noe?? And that the aim for this year... Watak not coming out d... |
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Nov 3 2008, 06:19 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(mych91 @ Nov 3 2008, 06:18 PM) example would be the image of a light bulb on a mirror.. mean?u cant capture it on a screen can you.. |
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Nov 3 2008, 06:21 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(vick5821 @ Nov 3 2008, 06:19 PM) mean? meaning you can not take it out and paste in somewhere. na mu deh ? |
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Nov 3 2008, 06:22 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..mean it is abstrak?
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Nov 3 2008, 06:23 PM
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Senior Member
785 posts Joined: May 2007
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QUOTE(work_tgr @ Nov 3 2008, 06:21 PM) meaning you can not take it out and paste in somewhere. na mu deh ? lolThis sounds weird to me. No pun intended. |
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Nov 3 2008, 06:24 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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Vittual if not mistaken it form behind the screen?
For example mirror... |
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Nov 3 2008, 06:24 PM
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Senior Member
3,871 posts Joined: May 2008
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how abt upright?
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Nov 3 2008, 06:25 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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like cinema movie .. that image on screen is real.
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Nov 3 2008, 06:25 PM
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Senior Member
3,871 posts Joined: May 2008
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why is real?
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Nov 3 2008, 06:27 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Nov 3 2008, 06:25 PM) why is real? It is same wad.. |
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Nov 3 2008, 06:27 PM
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Senior Member
3,871 posts Joined: May 2008
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image in mirror not also same meh?
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Nov 3 2008, 06:29 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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QUOTE(vick5821 @ Nov 3 2008, 06:27 PM) image in mirror not also same meh? A mirror either concave or convex will produce diff type of inmage..For example 1 of the mirror will be virtual,upright, and enlarge something like that |
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Nov 3 2008, 06:30 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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tu lah ... no same leh ... susah nak cakap. later tell you
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Nov 3 2008, 06:30 PM
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Senior Member
3,871 posts Joined: May 2008
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oh..ok...later tell me..now go study chemistry
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Nov 3 2008, 06:30 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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hmmph.. it doesnt matter if u dont understand the real meaning of these terms.. for spm level, just memorize the characteristics of the images form and you'll be alright..
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Nov 3 2008, 06:32 PM
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Senior Member
1,424 posts Joined: Sep 2007 From: Woodlands, Singapore
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Upright left and right change..Like our mirror..
Inverted is terbalik... |
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Nov 3 2008, 06:39 PM
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Junior Member
479 posts Joined: Sep 2006 From: Planet Earth
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it is easier to explain by using diagram
real image  virtual image  |
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Nov 3 2008, 06:42 PM
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Senior Member
834 posts Joined: Sep 2006
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Hey, anybody have notes or links for BM Tatabahasa?
care to post it up? thanks. |
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Nov 3 2008, 07:06 PM
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Senior Member
3,871 posts Joined: May 2008
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QUOTE(noobianz @ Nov 3 2008, 06:39 PM) it is easier to explain by using diagram still dun understand.real image virtual image Added on November 3, 2008, 7:07 pm QUOTE(gzavincent @ Nov 3 2008, 06:32 PM) Upright left and right change..Like our mirror.. then how abt laterally inverted?Inverted is terbalik... This post has been edited by vick5821: Nov 3 2008, 07:07 PM |
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Nov 3 2008, 07:15 PM
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Junior Member
452 posts Joined: Oct 2008 From: ChocoLand
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The best example will be the words.
When the words is reflected on the mirror, the words will become literally inverted |
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Nov 3 2008, 07:18 PM
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Senior Member
3,871 posts Joined: May 2008
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this i know..how abt upright? same with laterally inverted?
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Nov 3 2008, 07:28 PM
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Junior Member
145 posts Joined: Jan 2008 From: Eu Tee Pee
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dude! read your reference book! it's all there!
do your homework first before u start asking questions.. |
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Nov 3 2008, 07:45 PM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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Don't forget, there's convex and concave mirrors as well as lens.
Both have different properties and should be easily found in your reference book. |
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Nov 3 2008, 07:58 PM
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Senior Member
3,871 posts Joined: May 2008
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i still dun understand what is virtual image..nvm wait for work_tgr
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Nov 3 2008, 08:03 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(noobianz @ Nov 3 2008, 06:39 PM) it is easier to explain by using diagram that one is good example for lensereal image virtual image |
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Nov 3 2008, 08:11 PM
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Senior Member
823 posts Joined: Apr 2005
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I've always been wondering about properties of images formed by lenses/mirrors..
I never found an easy way to memorise the properties, so I didn't bother :/ |
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Nov 3 2008, 08:12 PM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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Basic definition of virtual image:
An image which cannot be projected/focused onto a screen is called a virtual image. For mirrors, the image is virtual if it is behind the mirror. (Convex mirror will always produce a virtual image.) For lens, the image is virtual if it is front of the lens. (Concave lens always produce a virtual image.) When image is at infinity, the image is virtual. |
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Nov 3 2008, 08:14 PM
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Senior Member
4,583 posts Joined: Oct 2006 From: ... suddenly 1 week
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QUOTE(fhNicK @ Nov 3 2008, 08:12 PM) Basic definition of virtual image: very good. An image which cannot be projected/focused onto a screen is called a virtual image. For mirrors, the image is virtual if it is behind the mirror. (Convex mirror will always produce a virtual image.) For lens, the image is virtual if it is front of the lens. (Concave lens always produce a virtual image.) or same position as the object When image is at infinity, the image is virtual. |
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Nov 3 2008, 08:43 PM
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Junior Member
200 posts Joined: Oct 2007
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what is the formula for convex lens ?
is it 1/f=1/u+1/v or u=2f or wat ? how to know when to use these formula? |
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Nov 3 2008, 08:46 PM
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Junior Member
402 posts Joined: Sep 2008 From: Kancolle!
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1/u + 1/v = 1/f
Example: An object is placed at 30cm from a convex lens of focal length 10cm. Determine the position of the image. Your answer should be 15cm. |
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Nov 3 2008, 08:49 PM
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Senior Member
1,936 posts Joined: Nov 2006 From: Klang,Selangor
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I oso hard 2 memorize that light chapter.The only topic that i am not good at in physic,others topic ok ok nia.
Added on November 3, 2008, 8:50 pmI oso hard 2 memorize that light chapter.The only topic that i am not good at in physic,others topic ok ok nia. This post has been edited by sasaug: Nov 3 2008, 08:50 PM |
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