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# OCR Physics A Breadth of Physics (24th May 2016) Discussion Watch

1. (Original post by viktorh)
what did people get for the number of photons near the end? I got 2.89x10^15 per second
I got something x10^15.... How did you work it out? I used e=pt and divided the energy by 1.6x10^-19
2. (Original post by viktorh)
got 6.8 m/s for the speed of the carbon atom after the collision with the hydrogen atom. Seemed a little small to me but the carbon atom is massive in comparison so Im hoping that's right
I plugged it back in and it was right, so yeah probably
3. (Original post by viktorh)
got 6.8 m/s for the speed of the carbon atom after the collision with the hydrogen atom. Seemed a little small to me but the carbon atom is massive in comparison so Im hoping that's right
I got the same
4. what did people get for the multiple choice question about the power output over x and y with the two resistors in series? I guessed 28mW after coming up with 0.003 watts with all my calculations
5. What did everyone get for force applied for the graph of u^2 and breaking distance questions? I got 73575 or something using a=8
6. (Original post by julesaquilina)
I got something x10^15.... How did you work it out? I used e=pt and divided the energy by 1.6x10^-19
If im being honest I was rushed for time so calculated E and then played around with possibilities until I got a large enough number :/
7. (Original post by Rectum_resizer)
What did everyone get for force applied for the graph of u^2 and breaking distance questions? I got 73575 or something using a=8
same
8. (Original post by julesaquilina)
I got 70 something?
also got 70 something, was conservation of momentum I believe?
9. (Original post by julesaquilina)
I got 70 something?
78
10. (Original post by julesaquilina)
I got 70 something?
I got 78.6 or 78.8 something like that,I use m1(u1)*m2u(2) equal m1(v1)*m2(v2) whare the initial velocity of second one is 0m/s
11. (Original post by viktorh)
same
I used a =16

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12. (Original post by Shmadm)
also got 70 something, was conservation of momentum I believe?
Did all you 70 people remember to use a negative value for velocity when the particle was going in the other direction?
13. (Original post by viktorh)
same
Forgot to divide 16 by 2 :/
14. (Original post by viktorh)
same
I got a=16 from the gradient of graph

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15. (Original post by viktorh)
Did all you 70 people remember to use a negative value for velocity when the particle was going in the other direction?
yeah
16. I thought the collision between the two objects was perfectly elastic - so you could use the conservation of kinetic energy?
17. (Original post by TheRandomGenius)
I thought the collision between the two objects was perfectly elastic - so you could use the conservation of kinetic energy?
you might have a point there
18. (Original post by viktorh)
same
How do you get equal 8 but I get 16 😞 whare I found gradient equal to 16
19. For the one with the asteroid I said the force because of the impulse.
20. (Original post by viktorh)
you might have a point there
I put momentum and energy

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