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# 2016 | OCR A2 Advancing Physics B | G494 &amp; G495 | 20th &amp; 28th June watch

1. Thought it was a fairly good paper overall, although my class was split, with about 2/3 saying it was good/alright and the other 1/3 saying it was hard. For the pressure question I got something like 83000 Pa, any thoughts?
2. (Original post by NamelessPersona)
Thought it was a fairly good paper overall, although my class was split, with about 2/3 saying it was good/alright and the other 1/3 saying it was hard. For the pressure question I got something like 83000 Pa, any thoughts?
I got about 170000 Pa??
3. (Original post by smartalan73)
I got about 170000 Pa??
The pressure in the vacuum had to be lower than normal, and the normal pressure was 100000 Pa.
4. (Original post by smartalan73)
I got about 170000 Pa??
i think you had to take that away from the 100kpa atmospheric pressure
5. (Original post by M12345689)
i think you had to take that away from the 100kpa atmospheric pressure
did anyone get 172 for the bullet velocity?
6. (Original post by NamelessPersona)
The pressure in the vacuum had to be lower than normal, and the normal pressure was 100000 Pa.
(Original post by M12345689)
i think you had to take that away from the 100kpa atmospheric pressure
Whoops i probably added instead of taking away then, didnt think about it having to be lower
7. (Original post by M12345689)
did anyone get 172 for the bullet velocity?
Yes, but I put 170 because 2 sf and stuff
8. (Original post by M12345689)
did anyone get 172 for the bullet velocity?
I got 170 to 2 s.f.
9. (Original post by M12345689)
did anyone get 172 for the bullet velocity?
Yes i got something like that
10. I'm kicking myself because i ran out of time and just needed 30 more seconds to write my answer to the 2nd last question where you had to show that intial KE was not equal to final KE for 2 marks (all i have to do was work out 1/2mu^2 and 1/2mv^2 to show they were different and KE was not coserved, I also skipped the whole Boltzmann factor Q

How many marks do you think that double spread on the boltmann factor was?
11. (Original post by smartalan73)
Whoops i probably added instead of taking away then, didnt think about it having to be lower
I think it was something like the weight of the masses = 1.96 N
Area of nozzle = 1.13*10^(-4)
Pressure = F/A
Pressure ~= 17000
100000 - 17000 = 83000 Pa
12. anyone get something like (200*9.8)/0.000113... = ~1.7x10^7 for the pressure??

And then for the precision bit after, (second area)/(first area) = 6.25???

*edit* oh no it was 100g not 100kg.... of course... okay so like 17,345Pa??
Then what are you supposed to do with the 100kPa atmospheric pressure?
13. (Original post by Simonium1010)
anyone get something like (200*9.8)/0.000113... = ~1.7x10^7 for the pressure??
The masses were in grams so that would give a weight of 0.2*9.8 = 1.96
See my post above for my reasoning, not sure if correct though.
14. (Original post by Simonium1010)
anyone get something like (200*9.8)/0.000113... = ~1.7x10^7 for the pressure??

And then for the precision bit after, (second area)/(first area) = 6.25???
I didn't know you had to do a calculation for the precicion bit, I just tried to explain in words why a larger area readuced percentage error
15. That one asking about the kinetic energy not being conserved in the collision... did everyone else get really big energy losses, like 14J before and 0.2J after?
16. (Original post by Simonium1010)
That one asking about the kinetic energy not being conserved in the collision... did everyone else get really big energy losses, like 14J before and 0.2J after?
Yes
17. (Original post by NamelessPersona)
The masses were in grams so that would give a weight of 0.2*9.8 = 1.96
See my post above for my reasoning, not sure if correct though.
Oh, I see. Well I think it was out of 3 marks so not too many lost... Maybe got one for equating weight and pressure x area...
18. how many marks /70 for an A?
19. (Original post by BongoBuddha)
how many marks /70 for an A?
/60*
20. (Original post by BongoBuddha)
how many marks /70 for an A?
I would say standard boundaries, around 46 or 47 for an A

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