D-SPM Thread Version Four-, Its never too late! :)
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 Nov 22 2010, 08:21 AM
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#1
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165 posts Joined: Nov 2009 
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Pm me
D |
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Nov 24 2010, 08:48 PM
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#2
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165 posts Joined: Nov 2009
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the more i read the more things i have to cover. Dayum.....
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Nov 24 2010, 11:50 PM
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#3
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165 posts Joined: Nov 2009
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The actual answer is actually the numb/sad look of the people in the opposite house. But i think house is accepted as well. lol
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Nov 25 2010, 12:59 AM
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#4
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AHHHHH THE STRESSSSSSSSSSSS.
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Nov 27 2010, 01:20 PM
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#5
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165 posts Joined: Nov 2009
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guys. 2B 1) the answer's 6 but i cant seem to get the answer. I keep getting n>7. Help?
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Nov 27 2010, 01:46 PM
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#6
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QUOTE(1malaysia @ Nov 27 2010, 01:28 PM) ar^(n-1) > 11 I know. But why does the sign changes direction? I don't really know the rule when it comes to changing the sign. < and >.45056 x 0.25^(n-1) > 11 (n-1) log 0.25 > log (1/4096) n-1 < 6 n < 7 n = 6  |
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Nov 27 2010, 01:49 PM
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#7
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165 posts Joined: Nov 2009
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I OVERLOOKED THE NEGATIVE LOL o0o. HAHAHAHA IGNORE MY o0o too tension d.......................
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Nov 27 2010, 01:58 PM
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#8
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165 posts Joined: Nov 2009
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QUOTE(556611 @ Nov 27 2010, 01:47 PM) lol i was even stupid Can anyone answer him cause i did the same thing too. We should only use log right?i did 1/4^n-1 > 4^-6 and i got n>7 . sigh. should only do the log method rite? |
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Nov 27 2010, 02:32 PM
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#9
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165 posts Joined: Nov 2009
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what if i do it this way?
(1/4)^n-1 > (1/4)^6 n-1 > 6 n > 7 Thats why i'm confused |
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Nov 27 2010, 02:47 PM
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#10
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why can't we cancel 1/4 with 1/4?
i know we'll get the answer by inversing 1/4. But i just want to clarify  |
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Nov 28 2010, 02:36 PM
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#11
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165 posts Joined: Nov 2009
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Why so? I thought sound travels faster in denser mediums. Like sound travels faster in solid than in air. So shouldn't sound travel faster in denser air? Provided there are more molecules for vibration of sound to take place. I'm not sure about this so please correct me if im wrong.
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Nov 28 2010, 02:44 PM
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#12
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165 posts Joined: Nov 2009
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QUOTE(ahda @ Nov 28 2010, 02:41 PM) I think you should not link it to the kinetic theory of the matter =D in this case you should see it through the properties of wave....correct me if I am wrong =D No technically it's not about the kinetic theory. It's stated in my book. The spped of sound in solids is greater than speed of sound in liquid / gases.Sound travels in air at about 330 / water 1400 and solids eg concrete at 5000ms. |
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Nov 28 2010, 02:52 PM
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#13
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QUOTE(1malaysia @ Nov 28 2010, 02:46 PM) density =/= state of an object oh er aite. cool. |
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Nov 28 2010, 08:31 PM
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#14
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165 posts Joined: Nov 2009
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PEOPLE. help. brainjuice sudah kering.
A) answer is q = 10 This post has been edited by Sean93: Nov 28 2010, 08:43 PM Attached thumbnail(s) 
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Nov 28 2010, 09:11 PM
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#15
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165 posts Joined: Nov 2009
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Q1.New mean = 70, which means 3(20)+q = 70
q=70-60=10 i dont understand this particular part. ): so with x1 x2 x3 x4 x5 having a mean of 20. We just assume x1 = 20? This post has been edited by Sean93: Nov 28 2010, 09:13 PM |
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