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  1. Charlotte20102013

    Physics: Post your doubts here!

    You just have to take moments about a point. You can take it from any point on the ladder. In this case to get the answer you take it from the highest point of the ladder and apply the formula clockwise moments = anticlockwise moments
  2. Charlotte20102013

    Physics: Post your doubts here!

    I can't find solutions for Q 13 and Q 18.
  3. Charlotte20102013

    Physics: Post your doubts here!

    Need help with some questions... http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_1.pdf Q7 (Ans: A) Q13 (Ans: B) Q18 (Ans: D) TY!
  4. Charlotte20102013

    Physics: Post your doubts here!

    So is P Q and R parallel to one another? I'm always having trouble deciding whether they are parallel or in series.. How to differentiate them?
  5. Charlotte20102013

    Physics: Post your doubts here!

    Can someone please help with this http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_11.pdf Q33 (Ans: A) (Also, are all three P Q and R parallel to each other)?
  6. Charlotte20102013

    Chemistry: Post your doubts here!

    Can someone please explain http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_12.pdf Q26 (Ans: D) Thank you :ROFLMAO:
  7. Charlotte20102013

    Chemistry: Post your doubts here!

    Ahhh... Now I get it.. Thank you! :rolleyes:
  8. Charlotte20102013

    Chemistry: Post your doubts here!

    Need a little help here guys... http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w12_qp_13.pdf Q38 [Ans: B (1&2)] I know option 1 undergoes redox, but how to tell if option 2 undergoes redox?
  9. Charlotte20102013

    Chemistry: Post your doubts here!

    When I name an organic compound, how do I apply the numbering? Like if thrs a functional group, the numbering follows the functional group. But what if there was 2 different functional groups in a compound, which do I follow? Like acid or carbonyl group or carboxyl group etc. Which functional...
  10. Charlotte20102013

    Chemistry: Post your doubts here!

    TYVM! :LOL:
  11. Charlotte20102013

    Chemistry: Post your doubts here!

    http://freeexampapers.automaticpapers.com/
  12. Charlotte20102013

    Chemistry: Post your doubts here!

    Can someone explain this http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_11.pdf Q8 (Ans:A) http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s12_qp_12.pdf Q14 (Ans:B)...
  13. Charlotte20102013

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_21.pdf Q 5 (d) (i) What is the compound formed? How do I determine this? When sulfuric acid is added to alcohol, shouldn't alkene be formed? Or is it ester? (since there is also carb acid...
  14. Charlotte20102013

    Mathematics: Post your doubts here!

    I still don't really get it... Another example: http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_63.pdf Q3(iii) Why is the midpoint calculated as 4.5 =(9+0)/2 and not 5 =(10+0)/2 ? Since the given info is already the boundaries, shouldn't...
  15. Charlotte20102013

    Mathematics: Post your doubts here!

    Hi all. Can someone help me with this http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_62.pdf Q4(i) Why is the answer '45-50' instead of '45-49'? Because the < sign does not have equal sign Q4(iv) Shouldn't we use Class boundaries in x-axis...
  16. Charlotte20102013

    Statistics S1 Doubts

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w11_qp_62.pdf Q4(i) Why is the answer '45-50' instead of '45-49'? Because the < sign does not have equal sign Q4(iv) Shouldn't we use Class boundaries in x-axis to draw the graph? Mark...
  17. Charlotte20102013

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_21.pdf Can someone explain question 6(b) please? Is there any way to work out the solution other than general knowledge or theories for (i) and (ii) ? Answers are (i) 2 kW (ii) 0.5 kW (iii) 0.67 kW
  18. Charlotte20102013

    Physics: Post your doubts here!

    Thanks :)
  19. Charlotte20102013

    Physics: Post your doubts here!

    No, you have only provided P12, while I need P11.
  20. Charlotte20102013

    Physics: Post your doubts here!

    Hi. Can someone help me with these questions? http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf Q9 B (Which concept or theory used?) Q10 C (Why is A not the answer?) Q30 C (Shouldn't there be interference patterns on RS as well?) Q32 C...
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