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# Official OCR A2 G484 June 2016 [Module 1] [90UMS] watch

1. (Original post by AmashQamar97)
Anyone with realistic predictions on the grade boundaries?
I think they'll be low, purely because it was a wierd paper
2. If you hold a pipe pumping water upward which way will you be pushed? Downward. So the reaction force is weight +sin55*force exerted by pipe. What did everyone get for maxiumum velocity of the oscillating system?
3. (Original post by AlistairMcDonald)
struggling to remember, but I think i did basically the opposite curve to the epe one, crossing the epe one at 40, with a max of 50

I got the same as you for the phase diff one too
Okay, cause I drew my stationary point for KE at the max EPE point, and one girl in my class drew KE sitting along the x axis and this has puzzled me :/

And that's somewhat nice to hear ahaha... I went over that phase question again and again and I was feeling pretty confident about it
4. (Original post by steph-carys)
How did you folks draw the KE/EPE graph? Differences of opinion at school
Inverted version of the potential energy graph, max at the same height as potential but when the potential is at a minimum. Starts and ends at same displacements.
5. (Original post by AmashQamar97)
Anyone with realistic predictions on the grade boundaries?
The june 2014 paper was the hardest paper of this series , grade boundaries were 39 for A,

In my opinion this paper felt harder, but i think its 39/40/41 for an A.
6. (Original post by AmashQamar97)
Anyone with realistic predictions on the grade boundaries?
Predictions
90UMS - 50 marks

80UMS - 46 marks

70UMS - 41 marks
7. (Original post by amashqamar97)
anyone with realistic predictions on the grade boundaries?
52 - 100
48 - a*
44 - a
40 - b
37 - c
8. How many marks do you think the boltzmann factor questions were worth in total (i left these blank)
9. (Original post by AmashQamar97)
Anyone with realistic predictions on the grade boundaries?
Based on the boundaries of june 2014 which was considered a hard exam, the A mark could drop as low as 39, so i'd say

A-42
B-38
C-34
D-30
E-26
10. Do they ecf? I written the max KE was 80 not 50 to calculate Vmax?
11. (Original post by tobybes)
Ok so ita probably not that helpful, I have the numerical answers I got.
5.78
3.45
0.61 m
1072 N
5pi/4
0.471
0.666 (Hz or s)
Masses 1.2 and 3.6 X 10^whatsits
Mass of star : 6.41 X 10^31 kg
0.925
23300
59800
1.03x10^33 (can't remember the question haha)
130.8 (shc)
489
11300mol

Hoping that 90UMS is around 55. Paper 5 is horrific.
Also,I think:
CAP - 52
A* - 47
A - 42
12. (Original post by Asiimov)
Inverted version of the potential energy graph, max at the same height as potential but when the potential is at a minimum. Starts and ends at same displacements.
Damn, I botched up my graph then. Hopefully there will be full ecf for following calculations..
52 - 100
48 - a*
44 - a
40 - b
37 - c
Are u retarded last years exam was much easier and was 43 for an a u spaz
14. (Original post by Jm098)
Do they ecf? I written the max KE was 80 not 50 to calculate Vmax?
Same fmll. Was going for 100% umsd
too. Think I may miss out now
15. (Original post by Danny_L)
Same fmll. Was going for 100% umsd
too. Think I may miss out now
Its actually so annoying isn't it haha now I realise why the boundaries are so low, so many silly mistakes
16. Anyone else absolutely hate that exam? Had a mini panic attack during it. Just gonna find a way to sell my soul for an A haha
17. (Original post by Danny_L)
Same fmll. Was going for 100% umsd
too. Think I may miss out now
Hey same here! Plus I messed up the mass of S2... and the hose question...
18. F=(-GM1M2)/(R1+R2)^2
F1=4pi^2M1R1/T^2
R1=1.2times10^12
R2=3.6times same power
To find velocity use v=2piR/T
I can't remember the exact answer but if process is correct the answer should be right as well.
19. was the paper out of 70?
20. (Original post by Danny_L)
Same fmll. Was going for 100% umsd
too. Think I may miss out now
where did you get the 50 from? i wrote 80 too

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