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  1. optimistic

    Chemistry: Post your doubts here!

    Can someone please help me with Q3a part 1 and 2! plzzzz..... http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_43.pdf
  2. optimistic

    Chemistry P4| A2 only

    Can someone please help me with Q3a part 1 and 2! plzzzz..... http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_43.pdf
  3. optimistic

    Chemo P5 tips

    extremeranger and angelgirl please help me as well!! =(
  4. optimistic

    Chemo P5 tips

    GUYS I NEED URGENT HELP IN THESE QUESTIONS.i don't understand how we can explain the anomalies in Q2 of this paper http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_52.pdf How will we find the concentration of the succinic acid...
  5. optimistic

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w11_qp_41.pdf Can anyone here explain me the answer to Q7 part c? PLEASE HELP
  6. optimistic

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w11_qp_41.pdf Can anyone here explain me the answer to Q7 part c?
  7. optimistic

    A2 Physics | Post your doubts here

    thanks a lot!
  8. optimistic

    A2 Physics | Post your doubts here

    Reviewing wont help. I don't understand it. please explain it!
  9. optimistic

    A2 Physics | Post your doubts here

    please help me solve this! http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_42.pdf Q9 B 2.... how come resistor "R" is the input resistor? the circuit is not showing anything like that.
  10. optimistic

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_42.pdf can anyone explain me Q1b(iii)? PLEASE HELPPPP!
  11. optimistic

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_42.pdf can anyone explain me Q1b(iii)?
  12. optimistic

    A2 Physics | Post your doubts here

    Okay I got it. the answer in the marking scheme is the half-life of the source is very long or decay constant is very small. I think they mean that the half life is so huge that there will be a constant emission throughout the period before reaching half life.
  13. optimistic

    A2 Physics | Post your doubts here

    how did you calculate it? i still don't understand! :(
  14. optimistic

    A2 Physics | Post your doubts here

    My question still remains. Why is the rate of emission of Alpha particles assumed to be constant?
  15. optimistic

    A2 Physics | Post your doubts here

    Hey please tell me when do we use V R.M.S and when do we use V0. I am confused in the question MAY/JUNE 2010 Q6b! http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_41.pdf
  16. optimistic

    A2 Physics | Post your doubts here

    but why have they taken 40 days as half life?
  17. optimistic

    A2 Physics | Post your doubts here

    please explain me MAY/JUNE 2009 Q 2 part a http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s09_qp_4.pdf
  18. optimistic

    A2 Physics | Post your doubts here

  19. optimistic

    A2 Physics | Post your doubts here

    I understand that but i don't get why force on wire is upwards? in the marking scheme they are saying pole P is North
  20. optimistic

    A2 Physics | Post your doubts here

    Can you explain Q6b 1 too?
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