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

1. (Original post by normanjones)
yep, what did you get for that truck compressor qn?
I put 80J for estimating the work done but they'll accept a range of answers as it was an estimate question.
2. (Original post by Faaiz Shah)
Yes!!! Thank god!!! I feel sorry for the other guy now.
Dw haha, it's one mark
3. (Original post by MangoFreak)
If that loses anybody a mark AQA are ****ing retarded. Electrostatic repulsion and electromagnetic repulsion are the same thing.
Could you just say electrostatic force which causes them to be repelled??
4. (Original post by chizz1889)
Poor quality image on earth due to IR being absorbed greatly by atmosphere, even though the angle is larger than smallest possible 😝
That's not wrong but I think they were looking for the other answer you may still get a mark
5. (Original post by Rubgangsci)
Yes.. Pistal service stole the paper
6. (Original post by MangoFreak)
Hm, maybe I made an error somewhere.

What were the values? I think I ballsed up somewhere.
Work out the relativistic mass of the electron (i think the speed was 0.98c) then use E=mc^2 where m is the relativistic mass
7. (Original post by MangoFreak)
It's all the same force.
Yeah I know but electromagnetic repulsion has to be between a magnetic field and a charge and electrostatic repulsion between two opposite charges, there is an ever so slight difference between the two
8. (Original post by normanjones)
6 marker
Can't remember my exact wording (and I've never been good at engine cycle's so I can't assume it is correct) but something like:

More work done as pressure builds; due to adiabatic change going to a greater pressure.
Gas heats up more due to rate of change of pressure increasing (same revolutions per minute).
So power input required goes up as power does.

I can't really remember if those were all the main points I put; but most of them. And it was padded out with some other stuff that may be relevant.
9. An A last year was 45/75 dyu guys think it will be similar this year
10. For Q1 in Astro, what is the biggest distance between Vesta and Earth?
11. astro boundaries?

Know I've lost 12 definite marks, feel **** cause everyones saying how easy it was
12. (Original post by Faaiz Shah)
Yes!!! Thank god!!! I feel sorry for the other guy now.
what question is this?
13. (Original post by Sbarron)
Could you just say electrostatic force which causes them to be repelled??
Sure.

(Original post by k9000)
Work out the relativistic mass of the electron (i think the speed was 0.98c) then use E=mc^2 where m is the relativistic mass
Oh I was talking about a different question **** oops Yeah pretty sure I got the right answer there
14. In Part A, what did people put for their experiment in the 6 marker?
I put something to do with a thick balloon, keep pressure constant, measure change in radius/volume for every change in temp, plot a graph and extrapolate; the absolute zero was the x intercept
15. (Original post by Emmanuel12344)
That's not wrong but I think they were looking for the other answer you may still get a mark
It was 2 marks so I'm fairly sure you got one mark for discussing the angle and then the other for saying about IR being absorbed, the clue was the bit which said 'on earth'. I'm fairly sure what I said was worth 2 marks
16. (Original post by chizz1889)
Yeah I know but electromagnetic repulsion has to be between a magnetic field and a charge and electrostatic repulsion between two opposite charges, there is an ever so slight difference between the two
It doesn't matter, the electromagnetic force was in play.
17. (Original post by 0beany0)
astro boundaries?

Know I've lost 12 definite marks, feel **** cause everyones saying how easy it was
I reckon for Astro it'll be

A*-65
A-59
18. (Original post by Ninja_heel)
I reckon for Astro it'll be

A*-65
A-59
doubt it. Has it ever been that high?
19. (Original post by alex3107_)
I put 80J for estimating the work done but they'll accept a range of answers as it was an estimate question.
was your paper PHYA5/2C or PHYA5/2CR?
20. (Original post by Sbarron)
Was that 2 marks??
Just 1 for 'state and explain'

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