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  1. G

    Physics: Post your doubts here!

    can someone please explain why the charges are same? E=V/d but the graph goes negative as it approaches sphere B so shouldn't they both be opposite signs?
  2. G

    Physics: Post your doubts here!

    Its hard to visualize this question so dont worry if you didn't get this question correct. Look at the spindle and forces you can see that the direction it must spin for the weight to lift up is clockwise. Now look at the 900N focus on the pulley for a second and imagine when the weight is...
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    Physics: Post your doubts here!

    how would we draw the graph of the last question?
  4. G

    Physics: Post your doubts here!

    i think anything to do with mobile phones isn't in the syllabus.
  5. G

    Physics: Post your doubts here!

    R=R0e^-pnx (R/R0)=e^pnx Ln(R/R0) divided by px= n since the units of R and Ro is 1/s when doing R/R0 you are basically doing 1/s divided by 1/s which is the same as 1/s multiplied by s/1 hence the s cancels out leaving you with: 1/px=n units of p=kgm^-3 and x=m since its kgm^-3 the m^3 goes up...
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    Physics: Post your doubts here!

    THESE GRAPH QUESTION ARE SO ANNOYING CAN SOMEONE HELP ME ON THESE just the graph parts of the questions, also for the rectifier question where would P and the capacitors go? thanks in advance
  7. G

    Physics: Post your doubts here!

    You and other people doing the same variant would be doing the exam at the same time that's why there are variants so students can't use other peoples time zones to see the questions coming. However the 22 and 21 usually have one or 2 similar questions but I doubt they can tell you since they...
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    Physics: Post your doubts here!

    can someone explain part A and part B i'm stuck
  9. G

    Hey dude are you still doing edexcel s3??? i need your help man

    Hey dude are you still doing edexcel s3??? i need your help man
  10. G

    Physics: Post your doubts here!

    Can you please explain why are you multiplying 0.018 by e^(-48*10-2)2 i I understand e^ part but why is 0.018 being multiplied to it. shouldn't it just be this: 0.012=e^((-48*10-2)2) i just dont understand why you're using the coefficient alpha thats been calculated in the first part of the...
  11. G

    Physics: Post your doubts here!

    i understand how to do part one, its basically alpha=(Z2-Z1)^2/(Z2+Z1)^2 simple acoustic calculation but part 2 I done understand how they did it, i'm stuck what do to next? this is what i did 0.012I=Ie^alphax alpha is 48 from the table but why did the marksheme say that alpha x is (48 *2x)...
  12. G

    Physics: Post your doubts here!

    ohh achaaaa it makes sense now. thx but what would happen to the photoelectric current tho
  13. G

    Physics: Post your doubts here!

    can someone help me for part 1 i dont understand it, i tried comparing the question to the observation of photoelectric effect but still got no luck :c for the second part: it says that wavelength is reduced so i thought that frequency is increased now since the wavelength already exceeds the...
  14. G

    Physics: Post your doubts here!

    part C only please
  15. G

    Physics: Post your doubts here!

    Can someone help me do paper 52 may june 2015 question 2e
  16. G

    Need advice on grades

    Cheers for the reply. So basically there's no chance that I'll get an A* if I don't repeat. Also do I have to repeat all of the papers or just the ones I feel like. I.e just repeat paper 3
  17. G

    Need advice on grades

    Your opinion does matter no matter who you are. So you're saying that I don't have to resit and I can still get an A*, if so what's the percentage I need to get, If I got a B e.g 60% in AS. (It's physics)
  18. G

    Need advice on grades

    i just got my physics AS results and i got a B. it didnt show my marks so i dont know how close i was to an A. i really want an A* in A-levels, so should i resit or could i study hard for a-levels and get an a*
  19. G

    Physics: Post your doubts here!

    any angels still awake???
  20. G

    Physics: Post your doubts here!

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