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  1. L

    Physics: Post your doubts here!

    Thank you so much, my notes were incomplete for this topic!
  2. L

    Physics: Post your doubts here!

    The mean kinetic energy of a molecule of an ideal gas is given by the expression KE = 3/2 x k x T where k is the Boltzmann constant and T is the thermodynamic temperature of the gas. A cylinder contains 1.0 mol of an ideal gas. The gas is heated so that its temperature changes from 280 K to...
  3. L

    Physics: Post your doubts here!

    http://www.sheir.org/a-level-physics-43-nov2012.pdf Can someone please walk me through question eight, part b and c please? This seems pretty basic but I think there's either something wrong with my notes, or there's something I'm missing? I've already tried the website...
  4. L

    Physics: Post your doubts here!

    http://www.sheir.org/a-level-physics-43-nov2012.pdf Could someone please solve question number 8 for me? Also, I tried the blog http://physics-ref.blogspot.com/2014/10/9702-june-2010-paper-42-43-worked.html#uds-search-results and it does not have the solved version of this paper, so I'd love...
  5. L

    Physics: Post your doubts here!

    http://www.sheir.org/a-level-physics-43-june2010.pdf Question 5, b2. Can someone explain the method/concept, the mark scheme is useless.
  6. L

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w09_qp_41.pdf Question 5, part B2, please!
  7. L

    Physics: Post your doubts here!

    Thank you!!
  8. L

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s09_qp_4.pdf Question ten, part B. Can someone please tell me exactly what is happening, what the 'gain' is, and what formula is used for the result?
  9. L

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s08_qp_4.pdf Question 4, b2. Can someone please explain this to me, I don't understand where the formulae are coming from and why we're using the method the mark scheme says to use.
  10. L

    Physics: Post your doubts here!

    AND Question 16!
  11. L

    Physics: Post your doubts here!

    Thanks again, I keep overlooking small details and bothering you. :p
  12. L

    Physics: Post your doubts here!

    Thank you so much, this was really helpful!
  13. L

    Physics: Post your doubts here!

    http://www.sheir.org/a-level-physics-12-nov2009.pdf Question 28, please!
  14. L

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s09_qp_1.pdf And question 29, I can't seem to understand it.
  15. L

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s09_qp_1.pdf Question 15 and 25, please. :/
  16. L

    Physics: Post your doubts here!

    Thank you again!
  17. L

    Physics: Post your doubts here!

    Thank you!
  18. L

    Physics: Post your doubts here!

    A particle has a charge of 4.8 × 10–19 C. The particle remains at rest between a pair of horizontal, parallel plates having a separation of 15 mm. The potential difference between the plates is 660V. What is the weight of the particle? A 2.1 × 10−14N B 2.1 × 10−15N C 2.1 × 10−17N D 1.1 ×...
  19. L

    Physics: Post your doubts here!

    Which operation involves the greatest mean power? A a car moving against a resistive force of 0.4kN at a constant speed of 20ms–1 B a crane lifting a weight of 3kN at a speed of 2ms–1 C a crane lifting a weight of 5kN at a speed of 1ms–1 D a weight being pulled across a horizontal surface at a...
  20. L

    Physics: Post your doubts here!

    The intensity I of a sound at a point P is inversely proportional to the square of the distance x of P from the source of the sound. That is I ∝ 1/x^2 Air molecules at P, a distance r from S, oscillate with amplitude 8.0µm. Point Q is situated a distance 2r from S. What is the amplitude of...
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