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  1. salvatore

    Physics: Post your doubts here!

    The uncertainty in g is simply obtained by adding the uncertainties of s and t. In this case, the ucertainty of 2s is 2% (The constant '2' is ignored). The uncertainty in t^2 is 3% + 3% = 6%. This is because t^2 is the same as t x t, so the uncertainties are supposed to be added. Total...
  2. salvatore

    Physics: Post your doubts here!

    I just interfered! :p For b(i) 800 × 0.5 × 9.81 = ρX × 0.6 × 9.81 [1] ρX = 666 ≈ 670 kg m−3 = 666 kg/m^3 (iv) ρhg = 666 × 9.81 × 0.7 [1] pressure = 4580Pa Your answers are correct!
  3. salvatore

    Physics: Post your doubts here!

    Oh yeah! Thanks :)
  4. salvatore

    Physics: Post your doubts here!

    Thanks.. And what about part 2, the ratio question?
  5. salvatore

    Mathematics: Post your doubts here!

    For ii, the answer is k < 1, k > 7
  6. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s10_qp_12.pdf Please help me with qn no. 11 (ii & iii). I've tried to sketch the graph (Attachment)... please check if its correct. For (iii), I'm totally confused! Thanks
  7. salvatore

    ~~jokes?? in here?? really??

  8. salvatore

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_w10_qp_23.pdf Please help me with qn no. 6(b)(ii).. I'm totally confused! Thans
  9. salvatore

    ~~jokes?? in here?? really??

  10. salvatore

    statistics doubt.please help

    You're welcome :)
  11. salvatore

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_s12_qp_22.pdf Could someone please help me solve qn no. 2 (b)? I'll really appreciate if you could sketch the graph for me.. Thanks!
  12. salvatore

    statistics doubt.please help

    This is quite a tricky one.. The probability of placing each one of the coloured tile (Let's take an example of black) is 1/3.. right? The second tile must not be black, therefore: P(Not black) = 1 - 1/3 = 2/3. The first tile could be any one of the three tiles, so the probability is 1 (Just...
  13. salvatore

    ~~jokes?? in here?? really??

  14. salvatore

    Chemistry: Post your doubts here!

    Yeah.. exactly! I asked my teacher the same question, but she said that it needs knowledge which is beyond A levels :) So just remember: When the forward reaction is exothermic, increasing the temperature decreases the value of the equilibrium constant. When the forward reaction is endothermic...
  15. salvatore

    ~~jokes?? in here?? really??

  16. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_s07_qp_1.pdf Please help me solve qn no. 8 (i & ii).. an explanation will be appreciated. Thanks!
  17. salvatore

    Physics: Post your doubts here!

    Thanks a lot for your help.. I don't understand part (ii).. why is the p.d 2.7?
  18. salvatore

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_w05_qp_2.pdf Could someone please explain the concepts in qn no. 7(b)(ii & iii).. I totally don't get it! Thanks
  19. salvatore

    Mathematics: Post your doubts here!

    Oh yeah.. now I get it.. I should have written it on a paper. Thanks!
  20. salvatore

    Mathematics: Post your doubts here!

    Thanks a lot both of you PhyZac Steel Arm I don't get the 'multiply every term by cos²x' and 'cos²x/cos²x = 1'.. but I'll try to figure it out :)
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