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# OCR PHYSICS B G494~ 11th June 2015 AM ~ A2 Physics watch

http://www.thestudentroom.co.uk/show....php?t=3397723

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2. Could someone drop me the G494 2014 paper If you have access to it by any chance?
Cheers
3. Still not startedrevision for this, whoops...
4. This exam is OK I think, it's just the silly explain/describe questions where I drop all the marks.
5. (Original post by Robbo54)
This exam is OK I think, it's just the silly explain/describe questions where I drop all the marks.
Planetary motion and occasionally SHM catch me out

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6. (Original post by Mutleybm1996)
Planetary motion and occasionally SHM catch me out

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See I still don't really understand SHM and how it all links in.

we have two differential equations for acceleration and somehow we have equations for time (t = 2*pi(sqrt(m/k)) and displacement (Acos(2pift)).

I've found the IOP revision material really useful because it gives you a higher level overview of the material -- SHM revision tomorrow I think.

Really need an A* though -- have you go your coursework mark off your teacher?
7. (Original post by Robbo54)
See I still don't really understand SHM and how it all links in.

we have two differential equations for acceleration and somehow we have equations for time (t = 2*pi(sqrt(m/k)) and displacement (Acos(2pift)).

I've found the IOP revision material really useful because it gives you a higher level overview of the material -- SHM revision tomorrow I think.

Really need an A* though -- have you go your coursework mark of your teacher?
30/30 you?

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8. (Original post by Mutleybm1996)
30/30 you?

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Well done, that's amazing! Are you going for an A*?
9. hey could anyone explain question 8 of this paper?

http://www.ocr.org.uk/Images/131316-...k-universe.pdf

the mark scheme has equipotentials of increasing distance, i thought it would be equal spacing..
10. (Original post by STATER)
Could someone drop me the G494 2014 paper If you have access to it by any chance?
Cheers
all on here if you still need them..

http://moodle.flintshire.gov.uk/hhs/...iew.php?id=780
11. (Original post by phawkins96)
hey could anyone explain question 8 of this paper?

http://www.ocr.org.uk/Images/131316-...k-universe.pdf

the mark scheme has equipotentials of increasing distance, i thought it would be equal spacing..
No, remember that equipotential is an orbit where there's no change in GPE/potential.

We also know that GPE is inversely proportional to the radius, therefore, the spacing will increase for the same potential.
12. (Original post by phawkins96)
all on here if you still need them..

http://moodle.flintshire.gov.uk/hhs/...iew.php?id=780
Managed to get it already, but thank you.

can someone help me on this question please.
14. (Original post by Robbo54)
No, remember that equipotential is an orbit where there's no change in GPE/potential.

We also know that GPE is inversely proportional to the radius, therefore, the spacing will increase for the same potential.
ah ok thanks, is it due to the inversely proportional to r^2 which means it increases?
15. (Original post by STATER)
Managed to get it already, but thank you.
no probs only saw it now haha
16. (Original post by Hesienberg)

can someone help me on this question please.
first one due to E=1/2CV^2 and last one since that is a property of capacitors. hope thats better
17. (Original post by phawkins96)
first one due to E=1/2CV^2 and last one since that is a property of capacitors. hope thats better
The last one makes sense and using the formula make sense, but how do you know it takes 10 seconds for the capacitor to gain 180 micro joules of energy.
18. (Original post by Hesienberg)
The last one makes sense and using the formula make sense, but how do you know it takes 10 seconds for the capacitor to gain 180 micro joules of energy.
i remember having this discussion in class. i think because 10s is far larger than the time to charge so that is the max energy.
19. (Original post by phawkins96)
i remember having this discussion in class. i think because 10s is far larger than the time to charge so that is the max energy.
Ok that's fine. Thanks for the help! =)
20. (Original post by Hesienberg)
Ok that's fine. Thanks for the help! =)
no probs how are you finding physics? i struggle with the key terms and the 3/4 mark questions are the worst..

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