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

1. (Original post by eekeek)
Not saying I'm right but.... B-C was horizontal I think. So constant pressure. So no compression so no work done ON the fluid. That was my reasoning. Hey ho.
I thought cos work=p*change in volume, so included it...but yeah, hey ho
2. (Original post by Daniel....)
Same bar the P-V graph which I got wrong I believe, then ovbiously power after that...got the same efficiency for last q but diff number after? Can't remember what it was...
Sweet at least that is a majority though Last questions i just rearranged efficiency =input/output cause it gave you output and efficiency =0.63 don't know if its right though??
3. (Original post by Mattyhouse)
Sweet at least that is a majority though Last questions i just rearranged efficiency =input/output cause it gave you output and efficiency =0.63 don't know if its right though??
Yeah exactly...I got a number with a slightly smaller power of 10 I think...same method I think tho...not too sure tbh
4. Does anybody know what the species involved in the beta decay in section A were?
5. (Original post by Daniel....)
Oh...Maths?
Bioengineering
6. (Original post by Vincent Song)
Bioengineering
7. (Original post by Daniel....)
From what I learnt, if it goes from the right hand side to the left on the PV diagram, work is done on the gas because the gas is compressed. If the gas expands, work is done by the gas meaning it goes form the left to the right.
Didn't B-C go right to left tho and so shiuld be included? What do you think full ums and A* boundary will be?[/QUOTE]

Me too...with that P-V diagram question, wasn't the straight bit on the top to the left of the curve I calculated as well, decreasing in volume? Meaning work had to be done on the gas? Just trying to understand my flaw...[/QUOTE]

From what I learnt, if it goes from the right hand side to the left on the PV diagram, work is done on the gas because the gas is compressed. If the gas expands, work is done by the gas meaning it goes form the left to the right.[/QUOTE]

What is the BC gas compression thing you're on about? It wasn't in thermal and nuc section, was it? I don't remember it lol. Hope I didn't miss out a whole page or s/t hahaha
8. (Original post by ImNormal)
Didn't B-C go right to left tho and so shiuld be included? What do you think full ums and A* boundary will be?

Me too...with that P-V diagram question, wasn't the straight bit on the top to the left of the curve I calculated as well, decreasing in volume? Meaning work had to be done on the gas? Just trying to understand my flaw...[/QUOTE]

From what I learnt, if it goes from the right hand side to the left on the PV diagram, work is done on the gas because the gas is compressed. If the gas expands, work is done by the gas meaning it goes form the left to the right.[/QUOTE]

What is the BC gas compression thing you're on about? It wasn't in thermal and nuc section, was it? I don't remember it lol. Hope I didn't miss out a whole page or s/t hahaha[/QUOTE]

Nope, applied haha
9. (Original post by Daniel....;57191159p)
a*a*aa in maths physics electronics and further maths respectively.
10. (Original post by Jamesbe1993)
I can confirm that he is correct on all those. Does anyone need a summary of the six marker?
Yeah.

For the mean square, I found the root mean square. It was only 1 mark so 0 I guess for that
11. (Original post by ImNormal)
For last question:
Mean square = 20000000 and something ?
Anybody remember KE of molecules?
did you just use 3/2kt with t being 370 I think?
12. (Original post by Vincent Song)
a*a*aa in maths physics electronics and further maths respectively.
Cool...mine's A*A*A this year in FM, Physics and Chem plus A* from Maths last year...
13. (Original post by ubisoft)
did you just use 3/2kt with t being 370 I think?
Yup. So hopefully got that right. I also got 319 for an answer, but I don't remember what it was? May have been 319 K for something?
14. Anybody do Astrophysics (2A), I want to check some of my answers.
15. (Original post by Daniel....)
Cool...mine's A*A*A this year in FM, Physics and Chem plus A* from Maths last year...
See you at imperial mate?
16. (Original post by ImNormal)
Yup. So hopefully got that right. I also got 319 for an answer, but I don't remember what it was? May have been 319 K for something?
Oh yeah I used 320K I remember now
17. (Original post by Vincent Song)
See you at imperial mate?
Hopefully! Gonna be close on grades but hoping so yeah!
18. (Original post by ImNormal)
Yup. So hopefully got that right. I also got 319 for an answer, but I don't remember what it was? May have been 319 K for something?
Yeah 319K was the right answer.
19. (Original post by Daniel....)
Hopefully! Gonna be close on grades but hoping so yeah!
How confident are for A* in further maths? I think i'll be close, maybe 5 ums away
20. (Original post by ubisoft)
How confident are for A* in further maths? I think i'll be close, maybe 5 ums away
Pretty, still got S2 and FP3 on monday, but sat M3, M2 and FP2 so far and they went good I think... Yeah? Hopefully you'll fall on the right side of the boundary! :-)

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