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Recent content by cocospaniel

  1. C

    Physics MCQs thread.

    Anyone else had a lot of B?
  2. C

    Physics P11 discussion

    This year's exams were harder than the ones before!! Especially Physics in general and Mechanics 2(the worst)! :cry: Let's hope for a low gt :)
  3. C

    Physics MCQs thread.

    Hey everyone, can we discuss the paper? btw I finished my exams!! :Yahoo!:
  4. C

    Physics MCQs thread.

    Someone wrote this before so I just copied it and pasted it. 'Alright this one was quite difficult and took some time. Just concentrate, Q and R are in parallel. If two equal resistors are in parallel, their equivalent resistance is half of their resistance (a fact), like 2Ω and 2Ω would give...
  5. C

    Physics MCQs thread.

    Your welcome :)
  6. C

    Physics MCQs thread.

    u^2 is proportional to x u^2 has a factor of 1. An increase of 20% is 1.2. (20% of 1) + 1 = 1.2
  7. C

    Physics MCQs thread.

    use the formula v^2 = u^2 + 2as where positive direction = direction of train u = original velocity (speed of train) v = final velocity (zero) a = acceleration of train (in this case, acceleration is negative) s = distance (from point where velocity = u to where velocity = v) The problem uses x...
  8. C

    Physics MCQs thread.

    Question 9!
  9. C

    Physics MCQs thread.

    Can someone help solve the hardest question in the world november 2010 q9, variant 1? :%)
  10. C

    Physics MCQs thread.

    november 2010 q9, variant 1?
  11. C

    Physics MCQs thread.

    You have to know the different wavelengths and frequencies for waves. Look at them here http://en.wikibooks.org/wiki/A-level_Ph ... _a_wave%3F It's of the order 10^15, so B
  12. C

    Physics MCQs thread.

    V= W(work done)/charge Q (w= Fd) (F=E(eltricfield strength)Q) (F=mg) V=EQd/Q = Ed Also V=mgd/Q Equate both equations Ed=mgd/Q, the d cancels out, and you're left with E=mg/Q They ask for Charge/Mass so Q/m=g/E
  13. C

    Physics MCQs thread.

    I don't really know how to explain this one, the vertical forces cancel each other out (30-30=0). The horizontal forces don't because hey are in the same direction (20+20=40). So it is non zero. Hope this helps.
  14. C

    Physics MCQs thread.

    Effiency= 80 = 4*10^6/power input * 100 THerefore power input is 5MW Power is Volt * current 5MW/25kV= 200 A THe answer is C
  15. C

    Physics MCQs thread.

    Use radius not diameter, so 100/2 = 50 mm Torque= Fd F(tension)=3/(50*10^-3) and you get 60N Then use the same formula but with 150/2 Torque= 60* 75*10^-3=4.5 Answer is D
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