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

1. For the assumption ii said in (bold letters : MOVING ) particles would that exclude some of the assumption for those answers? I put perfectly elastic between collisions and move randomly and rapidly?
2. (Original post by StarvingAutist)
About 4.8*10^17 s so around 15 billion years. I just did d/v because there was no point calculating the hubble constant. Are you allowed to do that?
Precisely what I did
3. what did everyone get for the radius in the astro, can't remember what it was the radius of tho
4. (Original post by MangoFreak)
You're missing the point entirely. The electromagnetic force is in play, that has nothing to do with whether "electricity" was present.

Electromagnetism is a field of physics, and may refer only to changing electric fields and induced magnetism.

But the electromagnetic force is one of the four fundamental forces of nature, and is in play in this question.
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?
5. (Original post by RemainSilent)
For the assumption ii said in (bold letters : MOVING ) particles would that exclude some of the assumption for those answers? I put perfectly elastic between collisions and move randomly and rapidly?
Varying KE and random motion no preferred direction of motion
6. Unofficial mark scheme?
7. (Original post by rohan9777)
what did everyone get for the radius in the astro, can't remember what it was the radius of tho
Around 3 meters

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8. (Original post by Ninja_heel)
Precisely what I did
Cool. I'm gonna assume it's a valid method.
9. (Original post by chizz1889)
Wasn't it -8.7*10^-3
depends what you read of the graph, there should be a range
10. (Original post by SuperMushroom)
Around 3 meters

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surely it was 15 if you took (i think) 5microwvaelengths into account?
11. (Original post by SuperMushroom)
Around 3 meters

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that's the diameter of the telescope right?
12. Was it 47000J for lead?
13. (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?
Charged particle moving = magnetic field. Charge + magnet = electromagnetic
14. (Original post by RemainSilent)
For the assumption ii said in (bold letters : MOVING ) particles would that exclude some of the assumption for those answers? I put perfectly elastic between collisions and move randomly and rapidly?
Either:
Random motion
Negligible time of collisions with container wall
Same rms velocity throughout
No interactions between the molecules
Particles have negligible size
15. (Original post by Andy1834)
nevertheless, it won't be that high, maybe 63 for full ums
The 6 marker this year was a joke. So i expected there to be a really hard relativity question following.. There was none and the maths was standard.. Although it being unstructured could cause a few problems. Nevertheless it is by far the easiest TP paper yet
16. (Original post by RemainSilent)
surely it was 15 if you took (i think) 5microwvaelengths into account?
Nope, the question gave the maximum angle subtended, so you had use the correct value for the wavelength

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17. (Original post by RemainSilent)
surely it was 15 if you took (i think) 5microwvaelengths into account?
minimum angular separation uses shortest wavelength
18. (Original post by RemainSilent)
surely it was 15 if you took (i think) 5microwvaelengths into account?
I got 15.2
19. The diameter was 3m I'm sure

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20. (Original post by mrno1324)
Charged particle moving = magnetic field. Charge + magnet = electromagnetic
Yes, but point charge approaching magnet = only electromagnetic, not electrostatic as the field isn't static, but point charge approaching point charge can be either electromagnetic or electrostatic

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