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

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    Anyone get 24 volts in thermal and 250 muons in option d??

    Also one question said shouw its 4 to something i got like 4.12... To the something
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    (Original post by Lizzieee4)
    It was related to Charles' law or the pressure law I think
    I was thinking something along those lines. I just couldn't think how you'd do it experimentally. I just stated that you'd keep pressure constant and slowly squished some area (with a piston) with a constant amount of gas. Measuring temperature in K as you do it. It should regress close to 0 or -273 in C. Which defines absolute zero as its the lowest temperature you can get to?

    I didn't write much at all, just attempted to cover all bullet points.
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    (Original post by dominicwild)
    I initially thought this too. But I looked at the units, which were  m^2s^-^2
    So I calculated the mean. Then I just squared it all.
    Nooo.. you calculate the mean of the square values, not the mean of the values and then square it all.
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    Yep you add the distances because maximum distance is when earth is on opposite side of the vestra(?) asteroid.
    Something like 3.57AU

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    (Original post by Sbarron)
    Now I'm far from the best student so DON'T go by these values but I just want to see if anyone got any the same as me.....

    Nuclear and thermal:
    0.05, 5.00
    1.4*10-15 m
    5.3*10-15 m
    1.3*10^17 kgm-3
    3.3*10-6 s-1
    8.2*10^11
    47000J
    160000
    319 K

    Astro:
    2.4*10^11
    15m
    -82
    5000 K
    97*10^6
    8.8*10^21
    4.9*10^17
    If that's the Schwarzschild Radius question (emboldened), you forgot to square the speed of light on the denominator.
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    DId anyone else do Pythagoras in question 1 of Astro?
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    Question about distance from Earth was a bit stupid, how are we supposed to know if at any point they are actually at opposite sides of the sun or not?
    I Just went 50/50 and chose -1 au, maybe wrong
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    (Original post by HenryHein)
    Yes, like 000alex' sketch but in words (also explained you could plot P against T as well), so with V against t pressure was constant and P against T, V was constant
    So V against T works as well?! Thank God I put pressure against T then changed it to V against Y, I drew a diagram of that graph too but with volume
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    (Original post by Faaiz Shah)
    Anyone get 24 volts in thermal and 250 muons in option d??

    Also one question said shouw its 4 to something i got like 4.12... To the something
    Yep and for the one after did you get 4.69x10^5V?
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    eridani b
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    (Original post by bwr19)
    Nooo.. you calculate the mean of the square values, not the mean of the values and then square it all.
    Oh **** are you serious?
    I though mean square speed was
    Take mean -> Square it


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    Guys did your paper for section b have R on the end of the code
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    Why did i see 5m for range if beta isn't it 1m in air?
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    (Original post by k9000)
    Yep and for the one after did you get 4.69x10^5V?
    Ye but i used the 4 to the something value not my unrounded awnser. That better be correct
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    (Original post by QueNNch)
    Yep you add the distances because maximum distance is when earth is on opposite side of the vestra(?) asteroid.
    Something like 3.57AU

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    I was talking about the mean squared velocity on the nuclear and thermal physics paper
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    (Original post by dominicwild)
    I initially thought this too. But I looked at the units, which were  m^2s^-^2
    So I calculated the mean. Then I just squared it all.
    No you did it wrong, its the mean square speed so it the mean of the squares of the speed so you square the speeds then average the squared speeds
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    (Original post by physics01)
    Guys did your paper for section b have R on the end of the code
    Yes.

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    (Original post by lad123)
    For the one you got 160,000 i thought you were supposed to square them first then add them, and then divide by 3?
    Oh crap
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    (Original post by QueNNch)
    Oh **** are you serious?
    I though mean square speed was
    Take mean -> Square it


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    That was the only mark i lost so far.
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    What did people put for the astro 6 marker?
 
 
 
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