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AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] Watch

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    (Original post by CD223)
    I think I used theirs.
    As did I, so we must have just read the graph differently
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    Just remember that the majority of people on 'thestudentroom' are quite academic so our views on the paper won't be representative of the population! That being said, it was an easy paper (not the easiest) and so will likely be around 60/61 for an A*
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    Does anyone remember any answers for applied physics?
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    (Original post by SuperMushroom)
    So what's your point?? Using Pythagoras would assume the same thing...


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    Yeah I just figured right angles are often assumed in astro. Like the moon crater questions when you assume the angle subtended is part of a right angle triangle.
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    (Original post by QueNNch)
    Yes everyones paper had R on the code. Confirmed.

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    I am pretty sure ours did not!
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    (Original post by mrno1324)
    F&//cking hell, did no one else do Pythagoras for first question? We're not told that the asteroid and the Earth are at opposite sides of the Sun at any one point.
    No but you were told it was located in the asteroid belt therefore at somepoint the earth will be directly the opposite side of the sun as there's a different orbital period for each body hence the biggest distance is when they are at either side of the sun
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    (Original post by Christina30)
    I am pretty sure ours did not!
    Had to have, AQA rewrote every single unit 5 paper (physics and bio)
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    (Original post by DomRauba)
    Is ' obeys newtonian mechanics' correct for the ideal gas :[
    i did that but i'm not so sure
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    (Original post by mrno1324)
    F&//cking hell, did no one else do Pythagoras for first question? We're not told that the asteroid and the Earth are at opposite sides of the Sun at any one point.
    I used pythagoras, but I think we should have just added 2.57 and 1 because it asks for the maximum distance from Earth.
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    (Original post by mrno1324)
    F&//cking hell, did no one else do Pythagoras for first question? We're not told that the asteroid and the Earth are at opposite sides of the Sun at any one point.
    But the maximum possible distance (which is what it asked) would be when they are on opposite sides. Besides, assuming they don't both have the same orbit speed (which they won't) if you wait long enough then eventually there'd be a time when they're both exactly opposite.
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    (Original post by chizz1889)
    Had to have, AQA rewrote every single unit 5 paper (physics and bio)
    I tripled checked and the questions were the same as the ones discussed here ?
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    My answers for the questions that didn't have a "show that the answer is this" were:

    Thermal and Nuclear
    Range of \alpha = 0.1m
    Range of \beta = 2.0m
    Density = 1.63 \times 10^{17}  kg  m^{-3}
    Number of nuclei = 2.35 \times 10^{17}
    Energy used = 47000J
    \left(C_{rms}\right)^{2} = 2.07 \times 10^{7} m^{2} s^{-2}
    Temperature = 319K

    Astrophysics
    Maximum distance = 5.36 \times 10^{11} m
    Diameter = 15m (unsure about this)
    In the 6 mark essay my period was 4 days, and my velocity was 109800 ms-1
    Magnitude = -0.01 (definitely derped on this; 1sf and I missed the minus lmao)
    Temperature = 16100K
    White dwarf radius = 9.37 \times 10^{6} m
    Black hole radius = 2.95 \times 10^{13} m
    Age of the universe = 4.96 \times 10^{17} s
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    (Original post by EconFan_73)
    But the maximum possible distance (which is what it asked) would be when they are on opposite sides. Besides, assuming they don't both have the same orbit speed (which they won't) if you wait long enough then eventually there'd be a time when they're both exactly opposite.
    Well bye bye at least 12 marks then.
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    How did people get 1.63x10^17 for density? I and others got 1.36x10^17
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    (Original post by k9000)
    How did people get 1.63x10^17 for density? I and others got 1.36x10^17
    It depends on how you rounded from the previous questions, which there were 2 of, so if you rounded the first time, the second, or none your answers will have varied
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    (Original post by Christina30)
    I tripled checked and the questions were the same as the ones discussed here ?
    Yes they are all for the rewritten paper which you sat, they rewrite each optional paper as a safety precaution when they rewrite the section a paper
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    (Original post by k9000)
    How did people get 1.63x10^17 for density? I and others got 1.36x10^17
    some people used the radius, which was given and some used the actual one they worked out small change caused a big density change
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    (Original post by k9000)
    How did people get 1.63x10^17 for density? I and others got 1.36x10^17
    i got 1.63, and used mass/volume where mass is the number of nucleons *1.67*10^-27 and volume is 4/3 pi r^3]

    although i used the values they gave us for all parts
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    (Original post by DomRauba)
    some people used the radius, which was given and some used the actual one they worked out small change caused a big density change
    Surely both will be accepted as i used 1.43x10^-15 (the actual value)
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    (Original post by Doomlar)
    My answers for the questions that didn't have a "show that the answer is this" were:

    Thermal and Nuclear
    Range of \alpha = 0.1m
    Range of \beta = 2.0m
    Density = 1.63 \times 10^{17}  kg  m^{-3}
    Number of nuclei = 2.35 \times 10^{17}
    Energy used = 47000J
    \left(C_{rms}\right)^{2} = 2.07 \times 10^{7} m^{2} s^{-2}
    Temperature = 319K

    Astrophysics
    Maximum distance = 5.36 \times 10^{11} m
    Diameter = 15m (unsure about this)
    In the 6 mark essay my period was 4 days, and my velocity was 109800 ms-1
    Magnitude = -0.01 (definitely derped on this; 1sf and I missed the minus lmao)
    Temperature = 16100K
    White dwarf radius = 9.37 \times 10^{6} m
    Black hole radius = 2.95 \times 10^{13} m
    Age of the universe = 4.96 \times 10^{17} s
    Range of alpha and beta I put as 5cm and 30cm. Do you thin k there'll be a range?

    I got 3.0m for the diameter of the telescope.
 
 
 
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