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  1. S

    A2 Physics | Post your doubts here

    No no C ii)!
  2. S

    A2 Physics | Post your doubts here

    C Can we use work done = p x Delta V = nR x Delta T?
  3. S

    A2 Physics | Post your doubts here

    another question, November 2009 Paper 42 Question 2 cii) Im trying to crack it . Can you help me? Another question:- for Internal energy = thermal + work done on system. So if work done is negative 30 Joules this means k.e is = -30 joules how can k.e be negative?
  4. S

    A2 Physics | Post your doubts here

    Is the potential energy of ideal gases considered to be ZERO or CONSTANT?
  5. S

    A2 Physics | Post your doubts here

    Did you get it? If you are the centre of rotation, how far are you from the centre? zero! so centripetal force is zero hence weight = normal force.
  6. S

    A2 Physics | Post your doubts here

    no, there should be atleast one value with 2 s.f , you sue the smallest available!
  7. S

    A2 Physics | Post your doubts here

    Radius of rotation, not radius of the planet! AT the poles, you are the centre of rotation i.e radius is zero!
  8. S

    A2 Physics | Post your doubts here

    You use 3s.f if not stated in the question, but if values used in the question are 2 s.f then use 2 s.f in ur answer!
  9. S

    A2 Physics | Post your doubts here

    I talk about this in details with alot of websites in previous pages but you werent here I guess :( When its on the axis of rotation i.e at poles , radius is zero so centriopetal force is zero, so the normal reaction is equal to weight. ** Extra information:- When its at the equator, the...
  10. S

    A2 Physics | Post your doubts here

    walls, aircrafts, buildings, wings, doors, anything which has a small change in length over a unit of time..to be observed!
  11. S

    A2 Physics | Post your doubts here

    remember the sidebands? Bandwidth is highest freq ( fc+fm) - lowest freq (fc - fm ) = 2fm = bandwidht
  12. S

    A2 Physics | Post your doubts here

    i would not use this, maybe you can top it. but dont use it alone just to be on the same side.
  13. S

    A2 Physics | Post your doubts here

    range of frequencies , where the maximum frequency is subracted from the lowest frequency!
  14. S

    A2 Physics | Post your doubts here

    June 2009 P4 Q2 a) :- Why is the rate of alpha particles seem constant? Answer in markscheme:- half life is very long/ but when I calculate half life by ln2 / decay constant its very shoort 1.98 x19^-7... Am I missing something? I think I am, the constant rate is Delta N / Delta t not the decay...
  15. S

    A2 Physics | Post your doubts here

    dont repeat your questions, wait for someone to answer, necause this will lead to crowding and reduce chances for other people. Increase surface area of object. uhmm, hold on for someone to scan it, cz mine is broken now :(
  16. S

    A2 Physics | Post your doubts here

    lets think it out.. hmmm What I did is that since work done by gas is 30 Joules then Internal energy decreased by 30 Joules. Internal energy = Total Kinetic energies + (Ep=0) [ideal gas ] -30 Joules = 3/2 N x k x T ? What do you think ? Lets suppose we want to calculate energy change? is it...
  17. S

    A2 Physics | Post your doubts here

    November 2009 Paper 42 Question 2 cii) Examiner report says insufficient data provided, what insufficient data? I calculated it by Work done = change in k.e...
  18. S

    A2 Physics | Post your doubts here

    From the application booklet:- "For a satellite having a period of 90 minutes, each orbit crosses the Equator 23 ° to the west of the previous orbit." Why is that? How was it calculated?
  19. S

    A2 Physics | Post your doubts here

    No no i got it, i just said the answer to my problem. That the wave of the ac is measured by a voltmeter of fixed polarity. But the ac supply polarity changes so the diode detects the negative half cycle as a positive one !
  20. S

    A2 Physics | Post your doubts here

    because there is a small pd across the diode 0.7 incase of silicon I think. 2 diodes = 1.4 voltage drop :)
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