• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. L

    AS Physics P1 MCQs Preparation Thread.

    10) First find the velocity with which the masses explode into (using the conservation of momentum formula): Let x be the speed of body 'm', and y be the speed of body '2m'. 0 = mx - 2my mx = 2my x = 2y That means body 'm' has a speed of x, and body '2m' has a speed of x/2. Using the K.E...
  2. L

    AS Physics P1 MCQs Preparation Thread.

    Damn you are quick. :P
  3. L

    AS Physics P1 MCQs Preparation Thread.

    A formula for phase difference: (distance between 2 points / one wavelength) * 2π One wavelength in this case is 340 / 500 = 0.68 Applying the formula, (0.17 / 0.68) * 2π gives us π/2 radian.
  4. L

    AS Physics P1 MCQs Preparation Thread.

    My original expression for the change in momentum was p2 - p1. But none of the options given in the question had that, so I had to multiply the entire expression by -1 to give -p2 + p1, i.e. p1 - p2 which still contains the same magnitude as my original expression. Normally you wouldn't do that...
  5. L

    AS Physics P1 MCQs Preparation Thread.

    I just explained this one. http://www.xtremepapers.com/community/posts/319447
  6. L

    AS Physics P1 MCQs Preparation Thread.

    Oops. I meant tension at X and Y and compression at Z. My reasoning is still correct, I just read the diagram wrong. :P Would be painful for something like that to happen in the exam. :\
  7. L

    AS Physics P1 MCQs Preparation Thread.

    Thanks and you're welcome. And yes, A would be right if we had to find the acceleration with the fastest speed.
  8. L

    Help please

    They won't be available until a week or two after the results. If you want to practice, try doing some previous past papers (unless you have already done them). Maybe some people might have a source to them, but I highly doubt it.
  9. L

    AS Physics P1 MCQs Preparation Thread.

    Tilt the images next time. :p For the 1st one, tension always acts on the outer edge of a bar and compression always acts on the inner edge. So there will be tension at X and Z and compression at Y. Another way of solving is imagining what will happen to the forces when the weight is pulled...
  10. L

    AS Physics P1 MCQs Preparation Thread.

    What I don't like about this question is that they assume you know the units of specific heat capacity (which isn't in the syllabus, to my knowledge). From Chemistry, I learnt that q = m * c * ∆T c = q / m * ∆T Units of c = J . kg^-1 . K^-1 Which can be further be made by changing J into kg ...
  11. L

    AS Physics P1 MCQs Preparation Thread.

    10. Force = rate of change of momentum. Change in momentum = p2 - p1 (please note that it's p2 and not -p2 as stated on the graph) Multiply by -1, you get - p2 + p1, or p1 - p2 = p1 - p2 / (t2 - t1) B 33. In parallel, voltage in each parallel combination is the same. Current in 5k and 5k...
  12. L

    Does A or A* in every subject ensure I'll get a good scholarship in my abroad studies?

    Um, I think they matter but they're not the only thing that do. I think the most important as AS grades, SAT and your school transcript/ECAs.
  13. L

    AS Physics P1 MCQs Preparation Thread.

    You're welcome. :) For the reading on VL to be high, the resistance of the thermistor must be high (since V = IR, as R increases so will V), which means the LDR must be in the dark. So low illumination. This is not the case for VT, because the voltmeter isn't connected with the thermistor but...
  14. L

    AS Physics P1 MCQs Preparation Thread.

    You know that, I α a² And, I α 1 / r² Using this relationship, can you make a link between a and r (as they are related in this question)? (r2 / r1)² = (a1 / a2)² Then just plug in the waves to get the answer.
  15. L

    AS Physics P1 MCQs Preparation Thread.

    OK for 19) Initially, the white sugar granules are small crystals, so they have a crystalline sort of structure. That gets rid of options A and D. From B and C, an amorphous solid is formed when something is supercooled and their shape isn't geometrical (like wax, toffee, candy floss etc.)...
  16. L

    AS Physics P1 MCQs Preparation Thread.

    Q4) I varies with 1/d² (given in the question) and the further you are from the light, the less light there is, so they are proportional, hence I α 1/d². This results in: I = k * 1/d² So it's a straight line graph from the origin with I on the y-axis and d² on the x-axis. 19 is just...
  17. L

    AS Physics P1 MCQs Preparation Thread.

    For this type of question, you have to use the liquid pressure formula separately for the oil and water and then add them up to give 17.5 MPa. For the oil, pressure = 9.81 * 830 * x For the water, pressure = 9.81 * 1000 * (2000-x) 9.81 * 830 * x + 9.81 * 1000 * (2000-x) = 17.5 * 10^6...
  18. L

    AS Physics P1 MCQs Preparation Thread.

    Water is actually sort of different from other substances, in that its liquid (water) form is more denser than its solid form (ice). The key words to figure that out in the question are 'when ice contacts..", this means that the atoms get closer together when going into the liquid form, so the...
  19. L

    AS Physics P1 MCQs Preparation Thread.

    Well, the thing is you need to know some reasonable estimates. An athlete can't take 100 seconds to complete a 100m race, that's just being unrealistic. :P
  20. L

    AS Physics P1 MCQs Preparation Thread.

    I made an arithmetic error (it's hard to do math on the keyboard :P), but otherwise I did everything right.
Top