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  1. L

    AS Physics P1 MCQs Preparation Thread.

    But his question (and mine too, sort of) is that why you can't take out the entire area by treating the whole thing as a triangle (beacause they said treat XY as a straight line, so wouldn't the whole line be straight?). Is my reasoning still wrong? Because I too want to know why you have to...
  2. L

    AS Physics P1 MCQs Preparation Thread.

    Since it's a velocity/time graph, when the mass is at its lowest and highest point the velocity will have to be zero so it can't be C. This means that only B or D can be correct, but D is at the lowest point of its motion. I think you are confusing it with a displacement-time graph.
  3. L

    AS Physics P1 MCQs Preparation Thread.

    I am not sure about the 1st one, because I also got the answer wrong the first time (I did the same thing as you). I guess it is because the wire is undergoing elastic deformation from point X and Y so it doesn't have the same gradient as from 0 to X. Someone correct me if I'm wrong, though...
  4. L

    AS Physics P1 MCQs Preparation Thread.

    E because Young Modulus is the same for the same material, regardless of its dimensions.
  5. L

    AS Physics P1 MCQs Preparation Thread.

    The sides are always balanced! Look at any typical AS level nuclear equation and you will see that the proton number and nucleon number is always the same on both sides. Mass-energy is also conserved but you can't tell that from just looking at the diagram. But the neutron number isn't always...
  6. L

    As physics p1 MCQS YEARLY ONLY.

    OK I will be posting June 2005 InshAllah today.
  7. L

    AS Physics P1 MCQs Preparation Thread.

    You use sin when you want to find the component parallel to the slope (i.e. opposite to the direction of friction). If you want to find the component down the slope, then you use cos. See the attached diagram. grey = mg sin ϴ green = friction (opposite to mg sin ϴ) black = mg cos ϴ red =...
  8. L

    AS Physics P1 MCQs Preparation Thread.

    No because mg was already given (10^3 N). If they said 10^3 kg, then you would multiply by g.
  9. L

    AS Physics P1 MCQs Preparation Thread.

    They try to make this question look hard but it's actually not. :P Work done = force * distance moved in direction of force Force is mg sin ϴ = 10^3 N * sin 30 = 500 N Distance in direction of force is 5m. Work = 500 * 5 = 2500 J.
  10. L

    AS Physics P1 MCQs Preparation Thread.

    Moment about Q = force * p.d. from pivot 3.0 = f * 50 mm f = 60 N (Q just provides an upward force, so there is no couple and hence we don't use the diameter. Don't be confused about a torque always involving a couple, torque just means turning effect and it could apply to a regular moment...
  11. L

    AS Physics P1 MCQs Preparation Thread.

    I see, thanks. :)
  12. L

    AS Physics P1 MCQs Preparation Thread.

    This one is a fact. As you stretch a wire, its length increases and the cross-sectional area decreases. Since R = ρL/A, and ρ is a constant, the resistance increases.
  13. L

    AS Physics P1 MCQs Preparation Thread.

    Could you explain 13 a bit more in detail? I mean, I don't get why you use half of the diameter.
  14. L

    AS Physics P1 MCQs Preparation Thread.

    I like the font style you use when posting the question numbers. ;) Q14) At the highest point, vertical velocity = 0 and horizontal velocity = E cos 45. The resultant velocity will therefore be the sqrt of 0^2 + E cos 45^2 = 0.50E.
  15. L

    AS Physics P1 MCQs Preparation Thread.

    I assume you mean mass * height * gravity? I was referring to Q15. :P The c.o.g. is what affects the height in the formula for P.E.
  16. L

    AS Physics P1 MCQs Preparation Thread.

    OK I got it now (I got help from elsewhere): The P.E depends on the centre of gravity, not the height. Initially, at column X, the P.E is mgh. Initially, at column Y, the P.E is 0 because there is no c.o.g. and therefore no height. After half of the water is filled on both sides, At column X...
  17. L

    AS Physics P1 MCQs Preparation Thread.

    It is possible for a body to have acceleration when velocity is zero. e.g. what is the initial acceleration of a ball thrown from the top of a building? It's -9.81 but the velocity is zero and displacement is at its maximum. This is sort of comparable to SHM. Over here the restoring force...
  18. L

    AS Physics P1 MCQs Preparation Thread.

    Yeah, you can take - and + as any direction you want, as long as you stick to them all the time. :P BTW, please ignore my explanation of Q15, it's wrong I think. I didn't read the Q properly. Once/if I get the right answer I will explain it. Or if you get it, then explain it to me. :P
  19. L

    AS Physics P1 MCQs Preparation Thread.

    The pressure in a manometer involves the height difference between the RHS and the LHS, it has always been like that. If you increase one side by, say, 2 cm, the other side would be reduced by 2 cm and the difference in height would be 4 cm. But if you mean to say why do we use the height...
  20. L

    all papers variant 12/ 22

    Well maybe you feel that way because of having pressure in the actual exam hall. For me, some papers weren't really hard but the time limit and pressure just screwed me over. A good example was Physics P2, everything was easy but I couldn't do the best of my ability because of pressure. Some...
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