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  1. i_try9621

    Physics: Post your doubts here!

    Ans is D from 11/M/J/12
  2. i_try9621

    Physics: Post your doubts here!

    I am grateful for this. :)
  3. i_try9621

    Physics: Post your doubts here!

    Thanks!
  4. i_try9621

    Physics: Post your doubts here!

    HELP Ans is B, from 12/M/J/15
  5. i_try9621

    Physics: Post your doubts here!

    Someone help me with this. Answer for this is D. It's from 9702/12/M/J/15
  6. i_try9621

    Physics: Post your doubts here!

    Ah! Thanks!
  7. i_try9621

    Physics: Post your doubts here!

    I did, but what I don't get it is, as quoted from the blog "Since the mass of the water is spread all over the volume it occupies, the centre of mass should be considered when calculating the (gravitational) potential energy." Why do they consider the centre of mass ? Do we generally consider...
  8. i_try9621

    Physics: Post your doubts here!

    Anyone help me with this question? Ans for this is B.
  9. i_try9621

    Physics: Post your doubts here!

    Doubt in Q 4) b) ii). I checked the Markscheme and they tell me to count the boxes, is there any other way to calculate the Energy Es? from http://papers.gceguide.com/A%20Levels/Physics%20(9702)/9702_w10_qp_22.pdf
  10. i_try9621

    Mathematics: Post your doubts here!

    http://www.intmath.com/trigonometric-graphs/1-graphs-sine-cosine-amplitude.php this could figure your doubt out. And also this http://www.purplemath.com/modules/grphtrig.htm
  11. i_try9621

    Mathematics: Post your doubts here!

    distance of P1 = 25 + distance of P2 using s = ut + 1/2 at^2 , find the time using v = u + at where a is 10 ms^-2 , find the velocities
  12. i_try9621

    Mathematics: Post your doubts here!

    find sin (theta) from the equation . using newton's second law , ( 0.4g x sin(theta)) - 1.4 = 0.4a
  13. i_try9621

    Mathematics: Post your doubts here!

    this could help .
  14. i_try9621

    Mathematics: Post your doubts here!

    They asked for the work done by the driving force while travelling on the slope(which is 800 m). If you take d sin(theta), it gives you the vertical distance between the slope and the ground .
  15. i_try9621

    Mathematics: Post your doubts here!

    This could help.
  16. i_try9621

    Mathematics: Post your doubts here!

    I think that the component of weight parallel to the slope for a distance of 500 metres is the gain in Potential Energy . Because if you notice, ''mgsinθ'' times ''500'' is 375000 J. And the gain in Potential energy is "mg" times "500sinθ" is also 375000 J. Although I may not be sure...
  17. i_try9621

    Mathematics: Post your doubts here!

    oh okay. So the question says "reflex" angle which means it's greater than 180 degree and less than 360 degree, which falls in 3rd and 4th quadrant where sin(theta) is negative. So you use a negative sign to indicate that.
  18. i_try9621

    Mathematics: Post your doubts here!

    what negative sign?
  19. i_try9621

    Mathematics: Post your doubts here!

    doubt in 7) iv) . It's from http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s13_qp_41.pdf
  20. i_try9621

    Mathematics: Post your doubts here!

    so did you get the papers? because I do have two of them
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