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Recent content by xHazeMx

  1. X

    Physics MCQs thread.

    you welcome ;)
  2. X

    Physics MCQs thread.

    A
  3. X

    Physics MCQs thread.

    initially, F acts on the whole body which is m + 2m = 3m so, F = 3ma, make (a) the subject as (a) is constant, u will get a= F/3m now F acting on 2m ( object Y ) F= 2ma F= 2m (F/3m) force acting on object Y = 2F/3 , so ans is D
  4. X

    Physics MCQs thread.

    TOTAL resistance = 30 + 6 = 36 ohms e.m.f = 9 mV = 9 x 10^-3 V V=IR I = 9 x 10^-3 / 36 = 2.5 x 10^-4 = 250 μA
  5. X

    Physics MCQs thread.

  6. X

    Physics MCQs thread.

    lol nice question, consider ur eyes as the positive plate and the question as the negative plate. u should get it as D
  7. X

    Physics MCQs thread.

    the phase difference between the molecules in a stationary wave is 180 degrees. so as u leave one node, the molecules should move in the opposite direction. now see the graph at A the longest arrow shows an antinode and the dot shows a node. in figure A, there are 2 antinodes ( 2 of the longest...
  8. X

    Physics MCQs thread.

    when the weight is added. surface Z contracts (compression) and Y stretches (tension) as the upper rod is bent. similarly with X, the surface containing X stretches so its is tension.
  9. X

    Physics MCQs thread.

    speed of approach = speed of separation speed of approach = u - ( -u) = 2u speed of approach = 5/3 u - (- 1/3 u ) = 2u ( this is the only choice which will give u the right answer ) .. A
  10. X

    Physics MCQs thread.

    basically, u have S = 1000 m ( 1 km ) a = 0.2 ms^-2 V = 0 m/s (as it stops after braking) and u need to find (U) .. which is the initial speed ( the safe speed ) put the values in the equation V^2 = U^2 + 2 a S 0 = U^2 - ( 2 x 0.2 x 1000 ) .................. ( the minus sign indicates the...
  11. X

    Physics MCQs thread.

    is it A ?
  12. X

    Physics MCQs thread.

    :Yahoo!:
  13. X

    Physics MCQs thread.

    the question is asking about the difference in voltages at X and Y. the cell provides 2 V, each of the two wires containing the 3 ( 5 ohms resistors ) will get 2 V as they are connected in parallel. in the first wire at X, the 2 V are divided by 3 since there are 3 similar resistors. so each...
  14. X

    Physics MCQs thread.

    B
  15. X

    Physics MCQs thread.

    Oh! i forgot about the 2 wires. okay here are the calculations: the current in the wire is 0.6 A the resistance in ONE WIRE in the distance of 800 m = 0.005 x 800 = 4 so in the 2 wires R= 4 x 2 = 8 ohms use the equation V = IR V = 0.6 x 8 = 4.8 V minimum voltage = 16 + 4.8 = 20.8 V
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