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OCR Physics A Breadth of Physics (24th May 2016) Discussion watch

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    i got 10^-something i cant remember but i got the number density to be 1.33x10^something
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    (Original post by samendrag)
    i got 10^-something i cant remember but i got the number density to be 1.33x10^something
    Same
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    what did ppl get for the AB wave question asking bout motion
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    (Original post by guitar167)
    I thought it was total energy, because of the conservation of energy means
    energy in =energy out just in different forms. Can anyone confirm??
    yup total energy and momentum
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    (Original post by Parhomus)
    Yeah I got the 5% uncertainty so when I got the answer I did 60x5/100=0.3
    Yeah I dont know why I multiplied it by two...made a lot of mistakes on that paper
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    (Original post by Parhomus)
    Don't u just divide the power by the energy per photon since power is energy per second.
    Yeah thats what I did, I worked out the photon energy and didvided the power by the photon energy
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    (Original post by isaac_wood_)
    Yeah the gradient was 16 but that was equal to 2a as u^2/x = 2a, so a = 8 (I think)
    Yep you're correct and then just use f=ma using the mass of 920kg
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    For the first question where you were asked to work out the time, did you get 0.73 or something?
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    (Original post by voltz)
    For the first question where you were asked to work out the time, did you get 0.73 or something?
    Yep
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    Did anyone else get C for an abornmal amount of multiple choices?
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    what was it out of boys, and what d'yas reckon for the boundarys?
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    (Original post by AshishSingh04)
    Did anyone else get C for an abornmal amount of multiple choices?
    Yeah I was thinking the same, glad I'm not the only one
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    (Original post by JAFF2400)
    What were the two conserved physical quantities in the inelastic collision (comet or whatever)? I think it was 1 mark, i knew momentum was one, I didn't put kintetic energy because its not conserved in inelastic collisions, so randomly put mass lol. I heard someone say it was momentum and total energy is that right?
    Yeah that's correct. Kinetic energy is only conserved in elastic collisions. I don't know why but I ca never seem to remember that difference.
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    (Original post by voltz)
    For the first question where you were asked to work out the time, did you get 0.73 or something?
    Yeah I got something like that.
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    (Original post by AccountingHelp)
    Yeah I was thinking the same, glad I'm not the only one
    what was the very last question?
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    (Original post by julesaquilina)
    i think i put 6.5
    I thought that was right.
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    (Original post by sddsfsdafs)
    Did anyone get 16 for elastic potential ratio?
    Yeah I did. It so often seems that the amount of silly theoretical crap for some mcq's is just disproportionate to the amount of marks.
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    Ive done the paper and I'll post up my answers and mark scheme later today.
    Its quite a tough one - still that means low grade boundaries.
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    (Original post by viktorh)
    got 6.8 m/s for the speed of the carbon atom after the collision with the hydrogen atom. Seemed a little small to me but the carbon atom is massive in comparison so Im hoping that's right
    Yeah i got that too. The collision is perfectly elastic so there's no reason to suggest that momentum is not conserved, and the carbon is 11 times bigger than the hydrogen. I think we got this right.
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    (Original post by Barklimus)
    Yeah i got that too. The collision is perfectly elastic so there's no reason to suggest that momentum is not conserved, and the carbon is 11 times bigger than the hydrogen. I think we got this right.
    i dont think so because the 420 m/s would have been negative so you should have got an answer in the 70s
 
 
 
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