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  1. S

    A2 Physics | Post your doubts here

    May you share your source please? :)
  2. S

    A2 Physics | Post your doubts here

    Answers for the question please! Thanks for the practice :)
  3. S

    A2 Physics | Post your doubts here

    uhmm by counting big boxes instead of small boxes ;)
  4. S

    A2 Physics | Post your doubts here

    We also need to know about critical damping and its application in car suspensions to abosrb the shock quickly!
  5. S

    A2 Physics | Post your doubts here

    where did you get this question?
  6. S

    A2 Physics | Post your doubts here

    I will start solving 2011 tmrw... so please hold on. :unsure:
  7. S

    A2 Physics | Post your doubts here

    There is no part c :eek: No! When we calculate .. The heat from atmosphere is NOT taken into account, which is why Q in calculations is lower than the true value! Hope you got it... Unless someone does, will solve it tmrw morning hopefully.
  8. S

    A2 Physics | Post your doubts here

    You need to solve part b correctly first. Total energy of satellite is negative.If it decreases, this means that it is becoming more negative, meaning that the numerical value of energy is increasing hence from the formula r decreases. When r decreases, the kinetic energy value will increase...
  9. S

    A2 Physics | Post your doubts here

    Q June 2007 Question 2 c ii) In calculation L = Q( from heater ) / Mass In real life L = Q(from heater + surroundings ) / Mass <----- This is the True / Correct Value for L! I think you can figure it out from here Question 4 c ii) Please Find in attachment.
  10. S

    A2 Physics | Post your doubts here

    When From Part ii) The Intensity that reaches the surface of the bone i.e the muscle bone boundary is 0.389! Hence the Intensity is 0.389I. This means that 0.661 has been reflected and 0.389 has been transmitted. From Part i) The Intensity that is reflected back from the muscle bone...
  11. S

    A2 Physics | Post your doubts here

    Just finished the paper. For question 2 b)i) internal energyy change is zero since it returns back to its original state. ( ill admit when I saw one mark, It was easier to predict its zero ) for b) ii) from R to P , you will not use the graph. You will find the decrease of...
  12. S

    A2 Physics | Post your doubts here

    ah crap, i thought they meant find the decay constant, kept getting the answer as delta N / N x delta T... hmm abt the percentage, i think they means that there is 0.02 error, but we need to leave a margin 0.08 so that MAX is 0.1. This means that we did not use the value of activity given in the...
  13. S

    A2 Physics | Post your doubts here

    -yup gain stable against the environment, thats what i dont understand. - ii) how do you derive it? iii) uhm how did you get A/Ao = 0.92? why did you subtract the percentages?
  14. S

    A2 Physics | Post your doubts here

    -candela agreed, but some questions use lux with LDR. -hmm yeah got that, but somehow, I cant understand why the gain is more stable against heat, light , temperature. ii) derivation and iii)
  15. S

    A2 Physics | Post your doubts here

    -Units of light intensity candela or lux? -How does negative feedback increase stability of gain? how does it increase bandwidth and reduce noise? -June 2009 Paper 4 Number 9.. Cant get my head around it...
  16. S

    A2 Physics | Post your doubts here

    Starting Nov 2010 41 now, will answer you in a couple of hours hopefully. Sorry for the delay...
  17. S

    A2 Physics | Post your doubts here

    Guys this link will help you with different types of damping. especially Q2a ii) June 2012 qp_42. Only light damping is in our syllabus I guess. http://www.miniphysics.com/2010/11/damping.html
  18. S

    A2 Physics | Post your doubts here

    1. In frequency modulation, amplitude doesnt change! 2. When the signal is negative, the frequency lower limit is 500 - 30 Hz= 470 Hz When signal is positve, the frequency is 500 + 30 Hz = 530 Hz The frequency of the modulating wave means that the frequency changes from the upper limit to the...
  19. S

    A2 Physics | Post your doubts here

    Unless someone answers it, I will be solving 2010 tomorrow. Attachment! P.S:- 0.05 percent silver = 5 g out of 100g 0.95 percent gold = 95 g out of 100g
  20. S

    A2 Physics | Post your doubts here

    Was explained to XPFMember, Thermal energy is required to increase the electric potential of the particles by breaking some intermolecular forces. But there is no work done against the atmosphere unlike boiling and the volume change when melting ice is significantly small. Therefore q increases...
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