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  1. salvatore

    Mathematics: Post your doubts here!

    Thanks a lot for the explanation, I really appreciate it. I understood what you said about adding/subtracting the P.E/K.E values but I still don't get when you have to do (K.E - P.E) or (P.E - K.E).. how do you know which one is greater than the other? Regarding the question paper that I had...
  2. salvatore

    Mathematics: Post your doubts here!

    I need some serious help in mechanics. In a question regarding the work done = change in total energy, I don't understand how to decide which one from K.E and P.E has a greater value so that I can subtract well. Please pleaseee help me understand the concept. Here is an example...
  3. salvatore

    Chemistry: Post your doubts here!

    That makes perfect sense.. dunno why I couldn't think of that. Thanks mate..
  4. salvatore

    Chemistry: Post your doubts here!

    I'm re-posting this.. anyone??
  5. salvatore

    Mathematics: Post your doubts here!

    Got it! Thanks man.. jazakallah
  6. salvatore

    Mathematics: Post your doubts here!

    Thanks a lot.. Just one more doubt: you ALWAYS have to use the overlapping region? Even if it is the > sign?
  7. salvatore

    Mathematics: Post your doubts here!

    Thank you for your help mate.. I kinda get what you said, here's what I did: |x-2| < 3-2x -(x-2) < 3-2x or (x-2) < 3-2x -x+2 < 3-2x or x-2 < 3-2x x < 1 or x < 5/3 The marking scheme gave the answer as x<1 only. I don't know what to do next.. please show me...
  8. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s03_qp_3.pdf Please help me with qn no. 3 I used the squaring method to solve this and got the critical values as x=1 and x=5/3. I don't understand why only x=1 is accepted and not 5//3. Could...
  9. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_s10_qp_41.pdf Someone please help me with this mechanics question. Qn no. 5(ii).. why is the kinetic energy greater than potential energy? Thanks
  10. salvatore

    Mathematics: Post your doubts here!

    I've understood it well.. Thanks a lot for your help :)
  11. salvatore

    Mathematics: Post your doubts here!

    I'm re-posting this.. anyone??
  12. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_s11_qp_31.pdf Could anyone please help me with question no. 5(ii)? I don't understand what to do.. Thanks!
  13. salvatore

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_51.pdf Could someone please help me with qn no. 2(a) of this paper? To calculate the mass of zinc, why do we have to do (B - D) and not (B - A)? Thanks
  14. salvatore

    Mathematics: Post your doubts here!

    Thanks s lot Rutzaba!! I'll definitely remember you in prayers :)
  15. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_33.pdf Could anyone please help me with qn no. 3 of this paper? Its urgent.. thanks!
  16. salvatore

    Nah man.. I have been looking for them too!

    Nah man.. I have been looking for them too!
    • salvatore
    • Profile post comment
  17. salvatore

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20%289701%29/9701_w11_qp_42.pdf Could someone please explain qn no. 3(c) - the whole of it. I don't know how to solve it Pleaseee!!
  18. salvatore

    Physics: Post your doubts here!

    I'm re-posting this.. anyone??
  19. salvatore

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_s06_qp_4.pdf Could someone please help me with the whole of qn 8 of this paper? I'll really appreciate it Thanks
  20. salvatore

    Physics: Post your doubts here!

    The 2kg mass is pulling the 8kg mass with a force of mg = 2 x 9.81 = 19.62N Hence the force pulling the 8kg mass is 19.62N But due to friction, the accelerating force would be: 19.62N - 6N = 13.62N From Newton's second law of motion; f = ma a = f/m a = 13.62 / (8+2)kg <------ dont forget to...
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