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  1. N

    Physics, Chemistry and Biology: Post your doubts here!

    for Q1 c) you would do dist/time=800/320=2.5 s then use v=at where a is g because the stone is falling under gravity. so 2.5x10=25 m/s Q7 i guess there should be no change in ammeter reading. it is only measuring the urrent across the 2 ohm resistor. Q8a)(ii)it would move down on the left (-)ive...
  2. N

    A2 Physics | Post your doubts here

    ...so for the last change workdone should be -480 J and increase in internal energy is 0? Thank You!
  3. N

    A2 Physics | Post your doubts here

    yea the values are not exact but they are approximate. for example when you do (2nd value-1st value) you get a multiple of elementary charge. i guess they only need approximate values
  4. N

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_w10_qp_42.pdf can someone help me with Q2 b part(iii)??
  5. N

    A2 Physics | Post your doubts here

    For Q1 the primary charge is 1.6x10^-19 becase all the values are integral multiples of 1.6x10^-19 for Q2 b (ii) you have to substitute density=Nm/V into the equation given and get the value of <c^2>. do square root to get r.m.s. value. the answer should be 500.
  6. N

    Mathematics: Post your doubts here!

    thank you!!
  7. N

    Mathematics: Post your doubts here!

    can someone please explain how to do part (ii)?? the answer is 61.2 degrees
  8. N

    Mathematics: Post your doubts here!

    how do you do part (ii)?
  9. N

    Mathematics: Post your doubts here!

    where does 2r come from?..sry..
  10. N

    Mathematics: Post your doubts here!

    can someone tell me how to do this quick..?!!
  11. N

    Physics MCQs thread.

    why is the answer to this c and not b? dosnt electric field strength decrease when plates are further?
  12. N

    Physics MCQs thread.

    help..?
  13. N

    Physics MCQs thread.

    but the answer in the mark scheme is a...
  14. N

    Physics MCQs thread.

  15. N

    Physics MCQs thread.

    how do you do this one?
  16. N

    Biology MCQ thread..!!

    can someone explain whly the answer is a??
  17. N

    Physics MCQs thread.

    is there a general formula for percentage uncertainites?
  18. N

    Physics MCQs thread.

    5 The power loss P in a resistor is calculated using the formula P = V 2/R. The uncertainty in the potential difference V is 3% and the uncertainty in the resistance R is 2%. What is the uncertainty in P? A 4% B 7% C 8% D 11%
  19. N

    Chemistry MCQ thread...

  20. N

    Chemistry MCQ thread...

    yup highly flammable
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