QUOTE(maximR @ Jan 20 2013, 11:27 AM)
Also , comment on 2012 Physics Waves question : There was one question where the answer is way off the actual answer .
SPM 2013 Thread
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Jan 20 2013, 08:28 PM
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QUOTE(maximR @ Jan 20 2013, 11:27 AM) Also , comment on 2012 Physics Waves question : There was one question where the answer is way off the actual answer . |
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Jan 21 2013, 12:30 PM
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QUOTE(blueflame @ Jan 20 2013, 09:44 PM) Hi there! You're back! been here all the time ... just waiting March for result announcement |
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Feb 25 2013, 08:44 PM
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Feb 27 2013, 01:48 PM
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actually students no need teachers. as long as they have books, they could study the books and score straight A+ in SPM. Simple
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Feb 27 2013, 10:14 PM
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QUOTE(maximR @ Feb 27 2013, 04:40 PM) But if there's a good teacher , the process will be much smoother and pleasant . well said |
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Mar 1 2013, 11:25 AM
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10 hours per day to study is possible ...
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Mar 4 2013, 11:33 PM
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Mar 17 2013, 06:28 PM
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QUOTE(Boy96 @ Mar 16 2013, 10:25 PM) seriously ... many students still believe to get 'something special' from the public seminar.all i want to say, the seminars should be free if it is done for public. if you have a good teacher/ tutor, you will know the right techniques to answer the questions. there is not need to attend such seminars anymore. of course, is up to students. if you have time and money, why not ? |
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Mar 19 2013, 12:06 AM
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QUOTE(AmericanPig @ Mar 18 2013, 08:06 PM) no input, no output. below than 10 marks is really a TERRIBLE result, you should be serious to your study.QUOTE(LawrenceLoL @ Mar 18 2013, 09:46 PM) yesQUOTE(x3cream @ Mar 18 2013, 11:56 PM) concentrate to your study. be more serious in study, you will definitely get a pass.are you playing handphone which teacher/ tutor are teaching ? |
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Mar 25 2013, 12:53 AM
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QUOTE(maximR @ Mar 23 2013, 10:06 PM) Guys , why does a high resistance nichrome wire supply more heat and brightness ? High resistance nichrome in fact produces less heat and brightness because the higher the resistance, the less the electrical current could flow through. However, nichrome is chosen because of its high melting point. From which equation does this concept come from ? When referring to heat/ brightness, we will check its power but not resistance. The greater the power, the more heat is released. |
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Mar 25 2013, 01:35 PM
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QUOTE(maximR @ Mar 25 2013, 12:47 PM) Yes , that's the 2012 Physics question . My tutor reiterated the same thing , nichrome wire has higher melting point so it will not melt easily . But in the past year book , it's stated that it has high resistance without talking about anything else . Now I doubt the reliability of the answers in the Physics past year book . It is of the same league with the Chemistry book , both have terrible answers . Others are really good . i get your meaning. will get back to you tonight with better explanation.Then why do you need a smaller diameter of wire ? If resistance increases , less heat is produced . So what's up here ? 2009 question . Tungsten lamp . Care to share the full answers here ? Higher resistance , higher power . Does this come from P = (I^2)® ? but P = V^2/R contradicts this . Higher resistance , lower power . for physics, there are more than one possible answers and it all depends on how you explain it. |
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Mar 25 2013, 02:35 PM
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QUOTE(mrsaimun @ Mar 25 2013, 02:11 PM) Heating element must have high resistance, both Nichrome and Tungsten are metals with high resistance, therefore there are used as heating elements in blow dryer, filament light bulb and even toaster. well explanation.Both of course have higher melting point compared to other metals, making them better metals to be used as heating elements. As to why we choose higher resistance metal, the concept is Electrical Energy is converted to Heat Energy when current flows through a wire as power/ energy loss. Recall the formula P = I^2R, so the higher the resistance the more power/energy loss to become heat. *yes there some errors in the marking schemes. For more reading you can refer to: http://scienceline.ucsb.edu/getkey.php?key=2548 http://en.wikipedia.org/wiki/Heating_element cheerio before going to sleep ... this is some additions from me to make the whole explanation complete. like what mentioned by maximR, P is directly proportional to R and also inversely proportional to R, this cause confusion. there are series and parallel circuits. In series circuit, current is constant, thus P is directly proportional to R. P=(I^2)R In parallel circuit, voltage is constant, thus P is inversely proportional to R. P=(V^2)/R Most ratings for electrical appliances are in power and voltage because they are connected in parallel (constant voltage) From the formula, P=(V^2)/R , we get R=(V^2)/P which means the higher the power the lower the resistance. Conclusion is, to get greater power (more heat/ light), resistance must be low. This post has been edited by work_tgr: Mar 25 2013, 02:40 PM |
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Mar 31 2013, 08:36 PM
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Mar 31 2013, 09:47 PM
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QUOTE(darrenliew96 @ Mar 31 2013, 09:23 PM) [BIO F4 Chapter 4] What is reducing sugar? Why sucrose is the only non reducing sugar? not really ... how about polysaccharides ?EDIT1: solve by yahoo answer:(althought not so clear about it)http://malaysia.answers.yahoo.com/question...23082340AAAwkGd |
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Mar 31 2013, 09:57 PM
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QUOTE(darrenliew96 @ Mar 31 2013, 09:55 PM) Polysaccharides is the polymer formed by condensation of glucose monomer. di means two.Actually I still don't understand why they need to separate disaccharides and polysaccharides. Does it mean polysaccharides is a complex form of disaccharides? poly is more than two .. usually more than 10 or ever 100 of monomers , link together. all polymers are non-reducing sugars , same as sucrose |
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Mar 31 2013, 10:04 PM
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QUOTE(darrenliew96 @ Mar 31 2013, 09:59 PM) I wonder how many times can an enzyme be reused because it won't be destroy after forming substrate complex. I think, the lifespan of an enzyme depends on its type and function. Different enzyme will have different lifespan.For Phys: I still cannot differentiate between real image and virtual image. Can someone explain? === Just look at the position of the image to justify real or virtual. For mirror, real image is outside the mirror while virtual image is inside the mirror. For lens, real image is opposite side to the object while virtual image is same side to the object. |
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Mar 31 2013, 10:04 PM
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Mar 31 2013, 10:18 PM
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Mar 31 2013, 10:26 PM
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QUOTE(darrenliew96 @ Mar 31 2013, 10:19 PM) SEJ Buku Teks F4 ebook version: do you have ebook for other subjects ?Sej F4 PDF But I frankly tell you, I would prefer the paper version textbook. |
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Apr 15 2013, 11:29 PM
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