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

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    (Original post by duncant)
    what did people say for the effect when that guy recorded only half of T? was it (1/4)g?
    I got 4g.
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    (Original post by C0balt)
    Loved it, dream paper
    What did you get for time constant, C0balt?
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    (Original post by kingaaran)
    I worked out the energy of the capacitor by the area under the graph - is this valid?


    Posted from TSR Mobile
    That's what I did. Area of trapezium. Did you find the lengths correctly by subtracting the lower value?
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    (Original post by duncant)
    what did people say for the effect when that guy recorded only half of T? was it (1/4)g?
    I said 4g because if he recorded the time for half the oscillation then recorded value of the time period will be less

    and g= (4pi^2l)/T^2

    if T decreases by scale factor 2 and g would increase by scale factor of 4
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    (Original post by Mango Milkshake)
    I got 4g.
    what was the question again? I said he would to times his value of g by 4 to get the correct answer, is this right?
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    (Original post by Mango Milkshake)
    That's what I did. Area of trapezium. Did you find the lengths correctly by subtracting the lower value?
    Isn't it area of triangle, cause it said energy increase?
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    (Original post by PiTheta97)
    Really nice paper. Only struggled with the 4 mark momentum derivation question

    Posted from TSR Mobile
    Same


    Posted from TSR Mobile
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    (Original post by Cadherin)
    I got 200s (2sf) - actually, I think it's right.

    The question asked for a decrease TO 80% of its original value. (I'm almost certain).

    Thus e^(t/RC) = ln(1.25)=t/RC
    No. It was decrease by.
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    Looool how did so many people get 200+ for the time constant. Idk what you guys did
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    For my multiple choice:

    DBBDDCDBDCBCCACBBDCAADCBD don't writ quote me on that, i only quickly typed them in at the end
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    (Original post by IMZL)
    Isn't it area of triangle, cause it said energy increase?
    It was the total area under the graph; so trapezium.
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    (Original post by lucabrasi98)
    Looool how did so many people get 200+ for the time constant. Idk what you guys did
    A decrease to 80% rather than a decrease by 80%.
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    (Original post by Mango Milkshake)
    I got 4g.
    Same. You're essentially doing 1/(1/4)
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    I said g would be 4x as big
    got 5.9x10^4 for something I think it was resistance
    28s for time constant
    1.15 x 10^-15 for something
    6.06X10^6 for something
    MCQs:
    D
    B
    B
    D
    D
    C
    D
    B
    B
    B
    B
    D
    C
    A
    B
    D
    B
    A
    C
    A
    A
    D
    C
    B
    D
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    it definitely was decrease by
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    (Original post by Beautywithabrain)
    Would it not be 4g because the gradient of the graph was 1/g?
    Yeah i got 4g as well
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    (Original post by Cadherin)
    A decrease to 80% rather than a decrease by 80%.
    But it said decrease by 80%.
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    (Original post by Ghettobadger)
    yessssssssssss
    Get in, like!!!!!


    Posted from TSR Mobile
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    (Original post by Cadherin)
    62 is my guess for cap - there were some easier and some harder parts, so I would imagine it will be 4 marks higher than last year but 5 or so lower than June 13.

    Plus I would imagine the facility of the multiple choice is a lot lower than usual (maybe 60% rather than 67%).
    It'll be higher. Very standard paper which was probably easier than June 14 which had 67 as a cap. I would assume 67


    Posted from TSR Mobile
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    will i get penalised for putting the graph for the 6 marker as
    L/(t/2pi)^2 for g as opposed to putting it as L4pi^2/T^2
 
 
 
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