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AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch

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    (Original post by tanyapotter)
    i think it's B too, but is this the right answer?
    Ooops
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    (Original post by Jay1421)
    5ms^-1

    Hope it helps!
    thanks, what was the question/solution? I cant remember and now it makes me paranoid haha
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    (Original post by notanooblol)
    It asked for time constant, RC
    Was -45/ln(0.8) involved at all in that question?
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    for the first capacitor question on the written paper, were we supposed to find the gradient or area?
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    (Original post by SRaccount)
    Was -45/ln(0.8) involved at all in that question?
    nope it was -45/ln(0.2)
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    (Original post by particlestudent)
    What would 54 to 58 marks be?
    A decent mid A grade. Good job. I think I got 51-54. I really messed up on the graph, proof and the electromagnetic brake question :/
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    (Original post by KellyLouise0)
    for the first capacitor question on the written paper, were we supposed to find the gradient or area?
    gradient
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    (Original post by notanooblol)
    How many people managed to do the derivation? It seemed like one of the hardest parts of the paper
    I did it but I don't think anybody else got it at my school
    (Original post by SRaccount)
    Was -45/ln(0.8) involved at all in that question?
    It was ln0.2
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    (Original post by duncant)
    thanks, what was the question/solution? I cant remember and now it makes me paranoid haha
    Okay so, the graph that you drew was basically a Force / Time graph and it asked you to calculate the speed of a 2kg mass after the 1 second time frame. So you calculate impulse using area under the graph:

    [ (0.5 * 5) + (0.5 * 15) ] = 10 = delta (mv)

    so Impulse, 10, divided by mass, 2, = velocity => 5ms^1
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    (Original post by C0balt)
    Yes I got these, the transformer was repeat from another year wasn't it
    I can't remember off top of my head but if you ask I might remember. I got C^2kg^-1 as the EG one is all I remember lol

    You might get a mark but I couldn't tell, because this was a new question
    I got C^2kg-2 for the ε0G unit
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    That's good, the six marker was very simple so they had to make it harder in some way, so glad I managed it
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    (Original post by C0balt)
    I did it but I don't think anybody else got it at my school

    It was ln0.2
    I would've done that derivation if it werent for the fact my equation stated that the unstable nucleus had a momentum before decay.... anything x 0 is 0. I feel like an idiot.
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    (Original post by SRaccount)
    Was -45/ln(0.8) involved at all in that question?
    the time constant question was RC= -45/ln(0.2) not 0.8 because the pd decrased BY 80% not to 80%. the answer was about 28 I think. If you used 0.8 I think you bgot about 200 possibly?
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    For the MC question with 8 graphs (picking the two for charging a capacitor I believe? with C/V on one y-axis and I (Current) on the other? I put the one with the C/V graph going up but the rate decreasing exponentially and the amplitude graph going down exponentiall (Becuase I think current always decreases with capacitors) Is this right?
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    (Original post by SirRaza97)
    A decent mid A grade. Good job. I think I got 51-54. I really messed up on the graph, proof and the electromagnetic brake question :/
    I messed up on proof and the em brake question too. I had a hard time explaining em induction in words.

    Did the wheel actually induce an emf which in turn opposed the change of flux linkage in the current? It really confused me...
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    (Original post by notanooblol)

    That's good, the six marker was very simple so they had to make it harder in some way, so glad I managed it
    Yeah was surprised to see that six marker, ISA was very similar
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    (Original post by spmenz123)
    I got C^2kg-2 for the ε0G unit
    nice I guessed that one and got the same :P
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    (Original post by willfmair)
    For the MC question with 8 graphs (picking the two for charging a capacitor I believe? with C/V on one y-axis and I (Current) on the other? I put the one with the C/V graph going up but the rate decreasing exponentially and the amplitude graph going down exponentiall (Becuase I think current always decreases with capacitors) Is this right?
    I did this too! Was this C?
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    C
    B
    A
    D
    C
    C
    D
    B
    B
    C
    A
    A
    C
    A
    C
    A
    D
    A
    C
    A
    A
    D
    B
    A
    D

    not all right please correct
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    (Original post by willfmair)
    For the MC question with 8 graphs (picking the two for charging a capacitor I believe? with C/V on one y-axis and I (Current) on the other? I put the one with the C/V graph going up but the rate decreasing exponentially and the amplitude graph going down exponentiall (Becuase I think current always decreases with capacitors) Is this right?
    Yes. Think this was A
 
 
 
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