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    June 10 Physics

    Haha, I know this is a really random topic at this time and it has probably been discussed before but.. How did your Physics P4, in particular, go? I skipped about 12 marks: a) ultrasound (yeah, I know, really stupid of me). Lost 6 or 8 marks here. b) the relay question (was probably a diode...
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    FURTHER MATHS OPINION

    Although I may be speaking way too early (considering my result is to be announced in August), but Further Maths really isn't that hard if it clicks for you. True, some questions blow your mind, but don't forget that the percentile is really low as well. E.g an A ranges about 140/200 which is...
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    SAT2

    The SAT 1 is compulsory if you're applying abroad. Two SAT2s (SAT Subject Tests) are usually required, Math I or II and a science will do, preferably Chemistry or Physics, with some exceptions e.g NUS and Harvard who require three. Doing both Math I and Math II is useless, you must do only one...
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    p5 phy

    Mark schemes are fine waisay, don't need them the solved papers THAT badly, seefour :/ http://spiff.rit.edu/classes/phys273/uncert/uncert.html ^ for uncertainties. But to sum up: U = A + B dU = [dA + dB] U = A - B dU = [dA + dB] V = L * W * H dV/V = dL/L + dW/W + dH/H D = M / V dD/D = dM/M...
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    Physics P2 Help

    Yes, it'll curve because the electron starts from rest. as for W04, R = V/I if V increases, R increases too.
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    help needed in Phy oct/nov 09 P-22!!!!!!!!!!!

    Another way of understanding this part is: If you add the amplitudes of both together (which are the same, but in opposite directions), your answer will be zero. This shows a destructive interference (per say) and hence a phase difference of 180 deg/ pi radians.
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    physics p2 help!

    W01: Q3 [c] (i) The weight of the lid acts at the center of gravity that is C, and it acts directly downwards. (ii) Tension always acts OUTWARDS from the point, hence it'll be towards the left on the cord. (iii) The force of the hinge on the lid is the REACTION to the weight, it'll act directly...
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    PHY PAPER 2 QUESTIONS...URGENT HELP

    You need to use the total extension, not the difference in extensions. The total extension of 3.8N is (16.3 - 14.2) = 2.1m The total extension of 3.8N + F N is (17.8 - 14.2) = 3.6m Converting them to m, 0.021m and 0.036m
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    physics p2 help!

    which year?
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    Physics P2 Help Required

    A diagram wouldn't be necessary. Just outline what's needed. If you really want to draw a diagram, 2D will do. The first part's basically a slit experiment e.g water/ripple tank/screen or microwave transmitter/receiver. In the second one, you'll probably just have to change the source e.g sound...
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    Physics P2 Help Required

    but you can't get the correct answer if you consider the odd integrals. I guess this is the only CORRECT way to solve it for now: viewtopic.php?f=26&t=1332&start=50#p20445
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    Physics P2 Help Required

    My point was that the answer is incorrect. As I said earlier, perhaps you don't need to take odd numbers i.e n = 1, n = 3, but you need to take /any/ whole number e.g in this case, n=1 and n=2.
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    Physics P2 Help Required

    I'm sorry, beacon_of_light, but I already assumed that you wanted to say (n + 0.5)*lambda. You still get the incorrect answer.
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    PHY PAPER 2 QUESTIONS...URGENT HELP

    June 04: 1b. You need to complete the diagram by drawing a parallelogram and then measuring the distance of the resultant. Use a scale like 1cm to 1N force. This will give you a parallelogram with sides 6cm and 8cm. The resultant which passes from one corner of the parallelogram to the other is...
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    PHY PAPER 2 QUESTIONS...URGENT HELP

    Hmph, I'm sure you've done terminal velocity? If you recall correctly, if an object is dropped from a height from rest, it'll accelerate with 'g' before the acceleration gradually decreases to 0 at which point the object begins to travel at a constant speed called terminal velocity. This...
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    PHY PAPER 2 QUESTIONS...URGENT HELP

    W03: 1 b ii) 2) The 6th, 7th and 8th dots all have a constant distance between them as the acceleration is zero. So find the distance between, say, the 7th and 8th dot. Common sense: if the distance b/w the 7th and 8th dot is, say, D. Then add 2D to the 9th dot. The 9th dot represents 0.9...
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    PHY PAPER 2 QUESTIONS...URGENT HELP

    June 03: 2 b) iii) The answer calculated in (ii) is in perfect conditions i.e no friction with tires or air resistance. So in real life, these factors need to be taken into account. More power is needed to overcome these forces. 3 b) i) Use the formula for arc length. s = r(theta) Theta is in...
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    PHY PAPER 2 QUESTIONS...URGENT HELP

    holy cow, those ARE a lot of questions. W06: Q1.a) ii) Work done per UNIT time implies it's a ratio, your answer is correct. c) i) You need to find the RATE at which kinetic energy is supplied. Kinetic Energy = 0.5 mv^2 Kinetic Energy / time (i.e kinetic energy per unit time) = 0.5mv^2/t You...
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    Physics P2 Help Required

    Hm, you're right! I just re-checked beacon_of_light's solution again and his/her answer seems to be wrong. I quote: ------------ n+(0.5)(0.33) = 0.28 ....and n = 0.35.. n+(o.5)(0.0825)= 0.28...and n= 3.39... ------------ The first part is correct, (n+0.5)(0.33) = 0.28, n + 0.5 = 0.28/0.33, n...
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    Physics P2 Help Required

    (2n+1)(lambda/2) = [(2n+1)/2] * lambda = (n + 1/2) * lambda Same thing. As for n, I believe it's the number of anti-nodes (i.e max displacement). I'm not entirely sure though, someone else care to reply?
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