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OCR PHYSICS B G494~ 11th June 2015 AM ~ A2 Physics Watch

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    I'd personally say you're looking at mid 40s for an A and not much over 50 for 100% UMS.
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    I genuinely don't think I could have done much worse :ashamed2:
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    I'd say this paper was medium. There were a few tricky questions I couldn't do. I reckon 43 or so for an A.
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    (Original post by Mutleybm1996)
    Did anyone else get 2.7x10^8?
    Also I think it went okay....few mistakes but not too bad!


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    yes
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    The binary stars question made some hilarious shapes hahaha
    boobs
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    Answers I can remember:
    2.7x10^8 m/s
    Binary star system: B
    Value of G: something x10^-10
    1.4Hz
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    Could you have attached the lift to something at the bottom?
    Or was it just decreasing the mass

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    Horrible paper for me, I don't think I did well. I've got an A* on virtually all of the past papers but that was massively frustrating. I got G as something x10-16 and 0.45Hz, ugh
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    (Original post by Mutleybm1996)
    Could you have attached the lift to something at the bottom?
    Or was it just decreasing the mass

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    I said increasing k by increasing the cross sectional area of the cables or using a different material with a higher YM
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    (Original post by urz13)
    I said increasing k by increasing the cross sectional area of the cables or using a different material with a higher YM
    I said the same . Didnt think the paper was that bad. Some of the questions were tricky and took a while. Did anyone else get something like 1.22x10^-10 for G. And 2.7x10^23 collisions per second
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    (Original post by Lewis7253)
    I said the same . Didnt think the paper was that bad. Some of the questions were tricky and took a while. Did anyone else get something like 1.22x10^-10 for G. And 2.7x10^23 collisions per second
    Got both of them
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    Was it not 1.28 x10^-10 for G once you had factored in the extra radius of the centre of earth to equator? (Given in question)
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    I won't quote everyone but I got the same answers as you guys (gamma factor one, G, rate of collision).

    Also I also said to increase k somehow to increase natural frequency f. I suggested a larger value of E or A. I don't think increasing length of cable will work because the lift occupies a set space.


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    (Original post by malachirp)
    Was it not 1.28 x10^-10 for G once you had factored in the extra radius of the centre of earth to equator? (Given in question)
    Yea i got 1.28x10^-10 was what I meant. Think i got 1.22 originally
    Then crossed it out and put that
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    (Original post by malachirp)
    Was it not 1.28 x10^-10 for G once you had factored in the extra radius of the centre of earth to equator? (Given in question)
    I thought that, but as it was a 2 marker thought they wouldn't care aha
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    For the number of collisions per second question, did you have to estimate a value for the collision time to work out the force per particle?
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    Did anyone else do the actuvation energy one. Was tricky. Required natural logs and complex rearring. Think i got something like 3.96x10^-20J
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    (Original post by Mutleybm1996)
    Could you have attached the lift to something at the bottom?
    Or was it just decreasing the mass

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    I said that another cable could be attached at the bottom to it swinging. What did everyone put for it being unpractical to damp the lift?
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    Can anyone remember the value they got for epsilon and the two capcitance questions? Epsilon was a tiny number, 10^-20 I think, while the first capacitance value was something like 10-2 Farads and the second was like 20 to 40 microfarads?
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    I wrote increase the cross-sectional area of the cables. Damping would make the building too top-heavy.

    For the temperature-pressure graph (I think it was that) I did a linear graph. B for the binary stars, 1.2x10^-10 for G.
 
 
 
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