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  1. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_w10_qp_61.pdf Could someone please explain qn no. 6 (iii, iv & v)? I don't understand what to do.. Thanks :)
  2. salvatore

    Chemistry Paper 21 discussion

    Damnn! I just realised.. I hadn't balanced the second equation right :(
  3. salvatore

    Chemistry Paper 21 discussion

    Everyone's getting 30-40% for the impurity question.. I got 85%!! I just hope I don't lose all the marks in the question..
  4. salvatore

    Chemistry: Post your doubts here!

    van der Waal's forces are the weakest because they are just induced dipoles..
  5. salvatore

    Mathematics: Post your doubts here!

    Oh yeah.. I think I got it. Sin(1/2x) is half a cycle so it does not reach the negative axis! Don't tell me I'm wrong now :p
  6. salvatore

    Mathematics: Post your doubts here!

    I'm freaking out for the exam!! :(
  7. salvatore

    Mathematics: Post your doubts here!

    Alright.. thanks So in summary, the domain of the function affects the min & max values while the period eg. sin(ax), sin(bx) etc will not affect it. Is that right?
  8. salvatore

    Mathematics: Post your doubts here!

    PANDA- I didn't wanna bother you with all those questions :) Omg.. I'm even more confused now. Which is which?
  9. salvatore

    Mathematics: Post your doubts here!

    Thanks a lot.. I have one more question. What if the functions were: f(x) = 3 - 2sinx for 0 ≤ x < pi f(x) = 3 - 2sinx for 0 ≤ x < 2pi Would there be any difference in the ranges? (Notice the domain has changed)..
  10. salvatore

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

  11. salvatore

    Mathematics: Post your doubts here!

    So in this case its 1.966 radians => approx. 2/3π ? We just estimate the point on the graph right?
  12. salvatore

    Mathematics: Post your doubts here!

    I was going through this again and failed to understand something.. does it matter where the curve cuts the x-axis in the final shape? Like in your case, it cuts slightly after π/2..
  13. salvatore

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

  14. salvatore

    Mathematics: Post your doubts here!

    PhyZac and PANDA- Thank you soooo much guys.. much appreciated :)
  15. salvatore

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w10_qp_11.pdf Could anyone please help me with question no. 7 iii? I don't understand how to draw the graph. I'll appreciate if you could explain and draw it for me..
  16. salvatore

    Chemistry: Post your doubts here!

    Lol.. not really
  17. salvatore

    Chemistry: Post your doubts here!

    Sorry.. I'm still doing AS.. that must be A2 right?
  18. salvatore

    Chemistry: Post your doubts here!

    A nucleophilic substitution reaction is when a nucleophile replaces the leaving group.. right? In this case, the leaving group is the halogen, Cl, and it is replaced by Nitrogen (And the rest of the compound). Nitrogen is a nucleophile because it consists of a lone pair of electrons. Hence...
  19. salvatore

    Physics: Post your doubts here!

    I always get confused in interpreting questions regarding a variable resistor or a length of a wire in a circuit. Could anyone please explain when p.d across a variable resistor or a length of wire in a circuit is maximum/minimum using a jockey (contact) to vary the resistance? Thanks
  20. salvatore

    Physics: Post your doubts here!

    I had got -5.76 Ns but thought that I'm wrong since the marking scheme gave 5.76 as the answer. Thanks a lot :)
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