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# AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] watch

1. (Original post by Remiepascua)
Anybody got any predictions or the 6 marker? i really struggle on those
SHM
Transformers
Momentum

At least that's what I think will feature this year
2. (Original post by Klaxoii)
I just had a go, and got D also. It's as of we're missing a factor of a half somewhere

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I got D too, but we forgot that only half of energy is stored by the capacitor so you do have to half it at the end.
3. (Original post by Klaxoii)
I just had a go, and got D also. It's as of we're missing a factor of a half somewhere

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hey guys, it is C. You work out the energy stored by the capacitor (E=0.5CV^2) then divide this by the time (5x10-3), you should get 4.5kW
4. (Original post by palaseum9)
SHM
Transformers
Momentum

At least that's what I think will feature this year
Leaning towards SHM now. Any idea for the context of question? Transformers have featured a couple of times, so I'm hoping they wont come up again. Momentum has come up once before, can't recall SHM coming up
5. (Original post by JaySP)
Me too I've made that error before. Actually, could it be because current is not constant as it is discharging? I think this may be why?
This is indeed why, you can only use Q=It when current is constant
6. (Original post by palaseum9)
SHM
Transformers
Momentum

At least that's what I think will feature this year
thanks bro
7. (Original post by palaseum9)
Solution to that capacitor question:
Ahh thanks man. I was using p=iv makes sense now

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8. This is what I think the 6 makers is going to be. I'd appreciate it if someone could probably add to it

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9. (Original post by gcsestuff)

This is what I think the 6 makers is going to be. I'd appreciate it if someone could probably add to it

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Very similiar to mechanics ISA so I have my doubts whether the 6 marker would be bridge with resonance.
10. Yeah the EMPA was on SHM as well, I reckon the 6 marker will be transformer/EM induction based
11. Any ideas of an EMI related six marker?
12. Just done the 2014 6 marker on an old syllabus paper. That means Thursday's 6 marker could be out there 😳😳😳😳

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13. (Original post by gcsestuff)
Just done the 2014 6 marker on an old syllabus paper. That means Thursday's 6 marker could be out there 😳😳😳😳

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Could you post which syllabus papers you're doing?
14. (Original post by CD223)
Any ideas of an EMI related six marker?
Maybe the classic what happens if this magnet gets dropped through this solenoid. They will probably be able to beef that into a six marker with reference to lenz's law, faraday's law and changes to the acceleration of the magnet
15. Just the ones from tomreds blog. On his unit 4 section, I think it was jan 09 I just did and it was there

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16. guys,
i haven't had the chance to upload the feedback files on here as i usually don't have access to a PC but now I'm using the public library and i was wondering if anyone of you has a google drive or something so that i could give the files to them and they could give us a link to them as they are more than 1 Mb and i cannot compress them to less than that.
thanks
17. This could be a cheeky 6 marker never asked this in the new papers

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18. (Original post by gcsestuff)

This is what I think the 6 makers is going to be. I'd appreciate it if someone could probably add to it

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I dont think saying that dampening changes the natural frequency is correct? Someone tell me if Im wrong. The rest looks pretty good here is what I wrote:

if a question went something like - 'bridges blah blah resonance blah blah dampening blah blah, answer must include blah blah'

bridges must be fitted with dampening systems because bridges are exposed to many external forces acting upon it at any given time. Without dampening these forces may set the bridge in violent (or damaging) motion when the natural frequency of the bridge matches the frequency of the periodic force applied to the bridge - for example people walking on the bridge with a matched frequency (soldiers marching.)

Pretty sure people could add to this. Hope it helps too.
19. (Original post by JJBinn)
Maybe the classic what happens if this magnet gets dropped through this solenoid. They will probably be able to beef that into a six marker with reference to lenz's law, faraday's law and changes to the acceleration of the magnet
Thats already been done. I know they've done transformers for 6 markers like 3 times now but there is a lot of content on transformers where as there isnt much to say about EMI. There might be a question on a rotating coil and how/when/where the magnetic flux is a maximum compared to when the emf is a maximum. That could confuse a lot of students as some people don't explicitly know the difference.
20. (Original post by JJBinn)
Maybe the classic what happens if this magnet gets dropped through this solenoid. They will probably be able to beef that into a six marker with reference to lenz's law, faraday's law and changes to the acceleration of the magnet
That's an absolute beauty of a six marker <3

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