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# OCR A2 Physics A: G484 & G485 - 15 & 21 Jun 2017 [Exam Discussion] watch

1. The little m alongside kg and s used to represent k was milli right (10^-3), so weird
The little m alongside kg and s used to represent k was milli right (10^-3), so weird
That would make sense as i had no m in my units but a strange way to ask you to put milli in the units i think
3. Was hard I panicked. What did everyone get for the last question 5
4. (Original post by Snxoxo)
Was hard I panicked. What did everyone get for the last question 5
was that the flow of water?
was that the flow of water?
Wasn't it a ratio one? 1.2?
6. (Original post by tch123456)
Wasn't it a ratio one? 1.2?
It was T two / T one right? As E=3/2KT
It was T two / T one right? As E=3/2KT
240/290 or something?
240/290 or something?
Yes
9. The questions I found were asked in a really weird way so I did not do good at all, I found t very hard
10. What did anyone put for the M-L^-1 graph question? The one just after the Boyle's law.
What did anyone put for the M-L^-1 graph question? The one just after the Boyle's law.
M proportional to pressure and L is proportional to volume therefore graph is a straight line through the original.
12. I thought if the mass increase the volume decreases but since CSA was the same it could only be L decreasing so I drew straight line through origin because I thought M would be proportional to 1/L but really not sure as I panicked
M proportional to pressure and L is proportional to volume therefore graph is a straight line through the original.
Thats what i did but i was confused about why it was negative (the y axis)
M proportional to pressure and L is proportional to volume therefore graph is a straight line through the original.
That's good to hear.

I don't suppose a figure of around 0.22 kg/s rings a bell for the flow of water concerning the specific heat capacity question?
was that the flow of water?
how did you guys do the flow of water question?
I calculated energy per 1.6 seconds as E = 130*10^3 * 1.6*10^-19 * 5*10^7
This energy multiplied by 0.9 therefore E*0.9=M*(SHC)*deltaT to work out M.
Then used D=M/V to work out volume
Finally this volume divded by 1.6 to give the volume per second.
16. Ask me any questions guys, think I can remember most
Ask me any questions guys, think I can remember most
18. (Original post by Super199)
Thats what i did but i was confused about why it was negative (the y axis)
I just did it from the Origin because you can't have a negative length but that's why I panicked because I saw it had a negative region but my line didn't go into the negative region
19. what do you reckon the grade boundaries will be ?
20. (Original post by mathsmaths2017)
dunno exactly what the questions are in order, or the numbers, but can remember the method probably

1) strontium and alpha nucleus
a) velocity of alpha nucleus
energy and mass given therefore 1/2*m*v^2
b) newtons laws to explain motion of strontium
strontium experiences a force as alpha particle experiences a change in momentum?
Repulsion between the two are equal and opposite, also act on each others bodies?
c) calculate v of strontium
M(initial)*v(initial) = M(final)^v(final)

2) ?

3)

4)

5)Thermal physics
a) work out initial n of baloon
use 4/3*pi*r^3 and PV=nRT using initial T, P
b) work out final pressure of baloon before it pops
use 4/3*pi*r^3 for new V and PV=nRT using final T, initial n, final V
c) ratio question
E=3/2KT therefore ratio is T(final)/T(initial)

Help.. pls

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