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AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] Watch

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    So I got 43/50 raw marks on my ISA which is what, roughly around say 49/50 out of 60 UMS?
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    (Original post by RA95)
    So I got 43/50 raw marks on my ISA which is what, roughly around say 49/50 out of 60 UMS?
    I think 43/44 is around full ums

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    (Original post by Mai.H)
    I think 43/44 is around full ums

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    No way?

    I was reading the grade boundaries today and it said 44-46 is an A*??

    Although it's really weird. Some papers 41/40 is an A which is 48 UMS so it would make sense if an A* was like 54 UMS?

    Still though, 52-54 UMS out of 60 would be brilliant
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    (Original post by RA95)
    So I got 43/50 raw marks on my ISA which is what, roughly around say 49/50 out of 60 UMS?
    You done much better than me, I got 39.

    43 should be around 50-52 ums
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    (Original post by ubisoft)
    You done much better than me, I got 39.

    43 should be around 50-52 ums

    Still very close

    Just depends on the practical and preparation I guess. Mine was on Capacitors which in my opinion is the easiest chapter within A2 physics
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    (Original post by RA95)
    Still very close

    Just depends on the practical and preparation I guess. Mine was on Capacitors which in my opinion is the easiest chapter within A2 physics
    Really? That's one of my hardest topics, I find mechanics the easiest
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    Can anyone help me on these multichoice questions. Cant seem to know how to do it. June 14 is terrible for multichoice. Name:  ImageUploadedByStudent Room1431702082.566636.jpg
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    (Original post by Jimmy20002012)
    Can anyone help me on these multichoice questions. Cant seem to know how to do it. June 14 is terrible for multichoice. Name:  ImageUploadedByStudent Room1431702082.566636.jpg
Views: 66
Size:  44.7 KB
    Name:  ImageUploadedByStudent Room1431702090.454065.jpg
Views: 67
Size:  48.8 KB


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    The answer to the first one would be 14mm and the answer to the second is 33.3V.

    Both of these questions require you to think about how certain quantities are related to each other:

    - Force is inversely proportional to the square of the distance
    - Electric potential is inversely proportional to the distance

    In the potential question, you need to sum the potentials from each charge (potential is a scalar quantity).

    Hope that helps
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    Can someone please explain how to work out this question mathematically? I always just take a guess :confused: I know it's the lowest common multiple, but how do you work this out with decimals?
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    (Original post by rem19)
    [img]http://www.thestudentroom.co.uk/attachment.php?attachmentid=3992 19&stc=1[img] can someone please explain how to work out this question mathematically? I always just take a guess :confused: i know it's the lowest common multiple, but how do you work this out with decimals?
    B. 1.9/0.05 = 38

    I don't know where you got LCM from?
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    (Original post by ubisoft)
    B. 1.9/0.05 = 38

    I don't know where you got LCM from?
    im sure it's just something that my teacher told me, but it never worked out :confused: thankyou!
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    Does anyone think the boundaries will be slightly higher this year?

    Last yearns PHYA5 boundaries were insanely low. 10 people in our class of 18 got A*s.


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    (Original post by ubisoft)
    B. 1.9/0.05 = 38

    I don't know where you got LCM from?
    If you think about it, the LCM of the two time periods is the first time they will be in phase if they are set off at the same time. It's another method instead of using the phase difference as a fraction of the time period.


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    (Original post by CD223)
    Does anyone think the boundaries will be slightly higher this year?

    Last yearns PHYA5 boundaries were insanely low. 10 people in our class of 18 got A*s.


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    Boundaries were low but I thought the exam was harder?
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    (Original post by CD223)
    If you think about it, the LCM of the two time periods is the first time they will be in phase if they are set off at the same time. It's another method instead of using the phase difference as a fraction of the time period.


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    what does LCM stand for again
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    (Original post by RA95)
    Boundaries were low but I thought the exam was harder?
    The exam wasn't in any way "easy", I just thought it was similar difficulty to previous years and yet had substantially lower boundaries.


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    (Original post by RA95)
    what does LCM stand for again
    Lowest common multiple


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    Please can somebody explain 17 and 24? For 24 I replaced BA with the flux in the formula BANwsinwt and let sinwt =1 so I had E = fluxNw, but I didn't know how to replace w with time. Thanks.

    http://filestore.aqa.org.uk/subjects...W-QP-JAN10.PDF
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    (Original post by CD223)
    Does anyone think the boundaries will be slightly higher this year?

    Last yearns PHYA5 boundaries were insanely low. 10 people in our class of 18 got A*s.


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    I think they will be much higher this year (much to my dismay)

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    (Original post by JJBinn)
    Please can somebody explain 17 and 24? For 24 I replaced BA with the flux in the formula BANwsinwt and let sinwt =1 so I had E = fluxNw, but I didn't know how to replace w with time. Thanks.

    http://filestore.aqa.org.uk/subjects...W-QP-JAN10.PDF
    For 17, the EPE is a maximum at P because the two particles are at the smallest distance, d, apart, and:

    

{E_{EP}}=\dfrac{Qq}{4\pi{\epsilo  n_0}d}

    The KE reduces to a minimum at P because all initial KE has transferred to EPE.

    The total kinetic energy and total potential energy constantly changes, BUT the total energy of the system remains unchanged.

    The answer is C.

    For 24,

    

E=\dfrac{N\phi}{T}



\Rightarrow \phi = \dfrac{Et}{N}

    The answer is A.



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