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

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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
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
Reply 2742
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k9000
2
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? :biggrin:
eridani b
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
:frown:

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Guys did your paper for section b have R on the end of the code
Reply 2746
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k9000
2
Why did i see 5m for range if beta isn't it 1m in air?
Original post by k9000
Yep and for the one after did you get 4.69x10^5V? :biggrin:


Ye but i used the 4 to the something value not my unrounded awnser. That better be correct
Original post by dominicwild
I initially thought this too. But I looked at the units, which were
Unparseable latex formula:

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
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
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
Original post by QueNNch
Oh **** are you serious?
I though mean square speed was
Take mean -> Square it
:frown:

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That was the only mark i lost so far.
What did people put for the astro 6 marker?
Reply 2754
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bwr19
2
Original post by physics01
Guys did your paper for section b have R on the end of the code


Yes. Astrophysics was a reserve paper.
Original post by bwr19
if that's the schwarzschild radius question (emboldened), you forgot to square the speed of light on the denominator.


ggrrrrrrr i know!!!!!!!!!!!! 😁😁😁😁😁😁😁😁😁😁😁🙉😁😁
Original post by dominicwild
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.


You didn't have to write how to carry out the experiment I don't think
Original post by wat a wizard
it was a white dwarf


Thank you Thats what I thought as well
Original post by Faaiz Shah
That was the only mark i lost so far.


Was it just 1 mark?
Original post by wat a wizard
i used the fact that its power output is similar to the sun, but much hotter


Yeah I put it was defiantly a B spectral class star but has large power so main sequence, hopefully they will award marks for explanation or in best possible case accept both for correct explanation?!

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