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

1. (Original post by SuperMushroom)
The diameter was 3m I'm sure

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Yeah it was
2. (Original post by k9000)
The 6 marker this year was a joke. So i expected there to be a really hard relativity question following.. There was none and te maths was standard.. Although it being unstructured could cause a few problems. Nevertheless it is by far the easiest TP paper yet
A number of people will be caught out by the potential differences,as both were quite involved,as was the relatvity question, although I do know a couple of people who guessed because it always falls to 75%
3. (Original post by chizz1889)
Either:
Random motion
Negligible time of collisions with container wall
Same rms velocity throughout
No interactions between the molecules
Particles have negligible size
It's said moving so elastic collisions and random motion
4. I meant for the radius of the star, what did everyone get?
5. (Original post by rohan9777)
I meant for the radius of the star, what did everyone get?
Oh I can't remember exactly it was pretty small in comparison to the radius of the sun, that's all I remember

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6. (Original post by StarvingAutist)
I got -8.7 * 10^-3
So about an order of magnitude smaller.
I got this too

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7. (Original post by Emmanuel12344)
It's said moving so elastic collisions and random motion
is ' obeys newtonian mechanics ' an answer?
8. (Original post by SuperMushroom)
Oh I can't remember exactly it was pretty small in comparison to the radius of the sun, that's all I remember

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Yeah it was approx 1.5 times radius of the earth
9. Unofficial Mark Scheme?
10. (Original post by Emmanuel12344)
It's said moving so elastic collisions and random motion
Yeah I put no interaction between the particles (which means the same as elastic collisions) and also Brownian motion
11. For the motion question I said

Molecules are moving randomly

Molecules are moving in all directions in the x y z planes

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12. (Original post by DomRauba)
is ' obeys newtonian mechanics ' an answer?
It should if it's about the molecules motions
13. (Original post by SuperMushroom)
For the motion question I said

Molecules are moving randomly

Molecules are moving in all directions in the x y z planes

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surely thats the same thing worded differently
14. (Original post by rohan9777)
I meant for the radius of the star, what did everyone get?
Something like 2 orders of magnitude less than the sun's radius. It wasn't exactly 2 orders less but I had it *10^6 rather than *10^8.
15. (Original post by DomRauba)
surely thats the same thing worded differently
No there is a subtle difference I believe haha

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16. (Original post by chizz1889)
Yeah I put no interaction between the particles (which means the same as elastic collisions) and also Brownian motion
Brownian motion refers to a different phenomenon, I think.
17. (Original post by chizz1889)
We can argue this all day haha but yeah I agree with your last paragraph. However electrostatic force is a type of electromagnetic force but all electromagnetic forces aren't electrostatic forces as it's not always a static field. Do u get what I'm trying to say now?
That's agreeing with me

I hope I didn't seem particularly angry or anything haha.

AQA may in fact not allow "electromagnetic" but that would be ****ing stupid
18. (Original post by StarvingAutist)
Something like 2 orders of magnitude less than the sun's radius. It wasn't exactly 2 orders less but I had it *10^6 rather than *10^8.
9.5*10 ^6 ring any bells?
19. (Original post by StarvingAutist)
Brownian motion refers to a different phenomenon, I think.
Nope it refers to motion of gas particles in an ideal gas

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20. I think I may have put electromagnetic repulsion instead of force because I was thinking of the alpha particles being repelled by the nucleus so I wrote repulsion by accident instead of force -.- would that still be valid for a mark? :/

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