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  1. X

    Chemistry: Post your doubts here!

    if you are in A2, then u only need to memorise for copper.
  2. X

    Mathematics: Post your doubts here!

    [Oct/Nov P31 2011] With respect to the origin O, the points A and B have position vectors given by OA = i + 2j + 2k and OB = 3i + 4j. The point P lies on the line AB and OP is perpendicular to AB. (i) Find a vector equation for the line AB. [1] (ii) Find the position vector of P. how do u...
  3. X

    Mathematics: Post your doubts here!

    thats it? the full question is that short?
  4. X

    Mathematics: Post your doubts here!

    [Oct/Nov P31 2011] With respect to the origin O, the points A and B have position vectors given by OA = i + 2j + 2k and OB = 3i + 4j. The point P lies on the line AB and OP is perpendicular to AB. (i) Find a vector equation for the line AB. [1] (ii) Find the position vector of P. how do u...
  5. X

    Physics: Post your doubts here!

    Re: Physics Help here! Stuck somewhere?? Ask here! :) is this for AS or A2? if A2 then this is my question. O/N10 paper 43. Q3b thanks.
  6. X

    Physics MCQs thread.

    the distance of the slope sin 30 = 1.5 / d d = 3m following the diagram below, find F F = 200 / sin 30 F = 400 N 400 - friction = 250 N work done = force x distance W = 250 x 3 = 750
  7. X

    Physics MCQs thread.

    ooh, the question says it CONTRACTS so the distance obviously decrease density=m/v, mass is the same but volume decreases, so density increases.
  8. X

    Physics MCQs thread.

    u mean O/N10 12 Q18? well, its quite simple cause the molecules will always have a range of energies evaporation occurs at all times, meaning molecules will leave the surface of water. and besides gas which have negligible attractive force, liquid and solid have significant attractive forces.
  9. X

    Physics MCQs thread.

    why can't it be C?
  10. X

    Physics MCQs thread.

  11. X

    Physics MCQs thread.

    Q27. all electromagnetic waves travel at the speed of light = 3 x 10^8 - microwaves = electromagnetic wave - wavelength = 2 x 15 = 30mm ( *try drawing out the stationary wave, maximum is the Antinode ) - using v= freq x wavelength - just apply the formula, you will get C
  12. X

    Physics MCQs thread.

    Q9. the y-axis is velocity at A. the mass is moving up and reaches its max height at B. then at C. the mass moves down and reaches it's max velocity to be at the lowest position, the mass have to stop moving meaning when it loses all its energy, it stops making D the answer.
  13. X

    9700 Biology May/June 2002 QP 1??

    whats the answer?
  14. X

    Biology mcq's help ...

    D. only catalase is enzyme only collagen is fibrous protein only haemoglobin is globular
  15. X

    Biology mcq's help ...

    B?
  16. X

    Biology MCQ thread..!!

    the answer is D. cause they will always cause a change in the tertiary. quaternary is not necessary present in enzymes, so the ALWAYS is tertiary.
  17. X

    Physics MCQs thread.

    the graph are all decreasing because the question says POTENTIAL the POTENTIAL DIFFERENCE increases, but the POTENTIAL decreases. potential difference is between two points, say between P and Q take potential difference at P = V and at Q = 0 ( means the potential decreases from P to Q ) as we...
  18. X

    Physics MCQs thread.

    the ans is B but you never give your answers for the previous questions!
  19. X

    Physics MCQs thread.

    asking
  20. X

    Physics MCQs thread.

    the answer is A.
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