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OCR Physics B - Rise and fall of the clockwork universe - 28th Jan watch

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    On behalf of my clever friend, this paper seemed like it was terrible! What did everyone else think of it?
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    There were some difficult questions, though most of it was pretty straightforward 'show that' type-questions. Got a bit hung up on the oscillation graph and the kinetic energy graph.
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    I thought the paper was pretty straightforward.
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    That... was... ridiculous
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    i found it quite mixed really i didnt have a clue about the question to do with the copper particles melting when they oscillate at 15% of d or sumat like that... anyone enlighten me?
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    Thought it was awful.
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    (Original post by dan9)
    i found it quite mixed really i didnt have a clue about the question to do with the copper particles melting when they oscillate at 15% of d or sumat like that... anyone enlighten me?
    On that question i used E = 1/2 k x^2 and E = kT, so k x^2 = 2kT

    However that was one question where I don't think I got the correct answer - I got a ridiculous 49,000K.
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    (Original post by dan9)
    i found it quite mixed really i didnt have a clue about the question to do with the copper particles melting when they oscillate at 15% of d or sumat like that... anyone enlighten me?
    Hey,

    E = 1/2 k (force per unit displacement) A²

    A= 0.15 x d (found in earlier question)

    E = k (boltzmann) T

    T = E/k (boltzmann)

    Sub in E found earlier and you get the melting point :-)

    I got around 1300K
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    What was up with the question on young modulus and spring constant/density having the same units? As far as I could tell they don't...

    EDIT: I for one could have used a bit more time too. (or a shorter paper)
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    I thought this paper was harder than all the past papers we did but i did expect it after last years June exam though. Even the momentum question was quite tricky.
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    The paper was bad... definitely resitting in june
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    :mad:
    (Original post by kylesawhney)
    Hey,

    E = 1/2 k (force per unit displacement) A²

    A= 0.15 x d (found in earlier question)

    E = k (boltzmann) T

    T = E/k (boltzmann)

    Sub in E found earlier and you get the melting point :-)

    I got around 1300K
    Shoot! I did exactly that but used 1.15 instead of 0.15 :eek3:
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    Didnt have enough bloody time again. The section A wasnt as easy as it normally is, and i didnt have a clue about the atom question. Also some nice questions like the velocty-KE graph and the piston question. But yeh... no time to check answers so i dont know.
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    I'm surprised you didn't have enough time - I found myself with 15 minutes to check answers.
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    I just wish we had lines for the questions where u gotta write. And wasn't expecting that one on electron emission, didn't do that this year. Felt sorry for the new guy in my class who didnt do it last year.
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    Mmm... yeh i guess the electron was synoptic, i just remembered it from chemistry though lol. Et=KT, then E=hf, finally v=yf. There was also a boltzmann factor part i seem to remember?
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    Wasn't a bad paper, wasn't the best either.

    Felt Section A was rather tricky, especially the wording of question 3. Obviously the one about the copper melting was a bit hard as well.

    TBH, I was expecting it to be worse so overall not too bad.
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    (Original post by Samw1se)
    I'm surprised you didn't have enough time - I found myself with 15 minutes to check answers.
    Really!? Did you miss a page or just do everything double time lmao, i did my calculations twice the first time round... but that only takes like 5 min extra!
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    (Original post by Skadoosh)
    Wasn't a bad paper, wasn't the best either.

    Felt Section A was rather tricky, especially the wording of question 3. Obviously the one about the copper melting was a bit hard as well.

    TBH, I was expecting it to be worse so overall not too bad.
    What was question 3?
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    (Original post by LearningMath)
    What was question 3?
    astronaut and momentum.
 
 
 
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