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# Official OCR A G481 mechanics 20th May 2013 watch

I did b-a (because they were acting in opposite directions )to find the net force and then used F=ma so a= F/m.. If we are talking about the same question
yeha same question, people seem to have done that, but i thoght that b was pulling the truck thing and a was pushing it so b+a
2. Found this paper so hard, so annoyed as all the mocks went well but this was just completely different. From what I've read I lost at least about 30 marks
3. I'll make a poll thread about how hard people found it.
4. has anyone got the paper?
5. (Original post by Serhat5991)
raw mark for 90ums is always 60/60. has anyone got the paper can you please email it to me..

Also here is the poll: http://www.thestudentroom.co.uk/show....php?t=2357507
6. (Original post by josephguen94)
Do you know for the terminal velocity question is it ok if i said weight = upthrust ?
yeah i think that will be ok, thats what my friend said
7. (Original post by dakenSoren)

Also here is the poll: http://www.thestudentroom.co.uk/show....php?t=2357507
dno i did my exam jan it was 60 was 90 ums
8. For the component question ( I think it was Q2 or Q3 ) I didn't actually calculate it.

I wrote 5sin30, and 13cos30 ( I made up the numbers, can't remember the actual numbers)

Is that right or did u have to calculate it
9. (Original post by cyiarik)
i remember some answers but not the actual questions they were answering :P , so ill just post random answers i got

kgm^-2
giga is 1000 times bigger than mega
density = 1.6x10^-? kgm-3 [forgot what it was to the power of]
force constant is the force per unit extension
R=1.4x10^-5 and F=6.3x10^-5 (something close to these)

3.5ms^-2 for instantaneous acceleration of a trolley i think
I got ratio of B/A as 2.8N
the moments question i got x(50-x)=12x and i think the answer was 0.37m

-power is rate at which work is done
-work done = 5.4x10^?
-output was 390 Watts
-Input was 1228 Watts / 1.3x10^3 Watts

i wrote for one question something about weight being smaller than drag at t=0.05 because the ball was decelerating and then at t=0.25 they were equal/there was zero acceleration

for the Youngs modulus question i got 1.9x10^9 Pa

For the last question i wrote that it was polymeric but forgot to finish my explanation of why it was good for aeroplane tyres (doh!) :L

i basically fluffed my way through the explanations; dont think i did that well tbh :L did anyone get similar answers to me?

i did youre trolley one was the same as mine
10. I actually got 40/60 in the January mock without prep. and definitely found this harder, it would be a crime if the grade boundaries aren't at least the same as the January exam.
11. post the paper pls
12. What did people get for the question with the Force (R) and Force (F) of the water droplet on the window. (8.0*10-5N)

i put 1.6 or something then scribbled it out and put 4.2 or something
13. Thought there were a few tricky ones. What did everyone do for the decelleration of the ball in the oil? It was a curved line of best fit.
Also did you have to change the stress into anything? It was in %
14. It's got to be about 40-43 for an A even when you consider the June exams are higher boundaries... so many people found it difficult, even those you'd expect to be able to it all.
15. (Original post by Vorsah)
For the component question ( I think it was Q2 or Q3 ) I didn't actually calculate it.

I wrote 5sin30, and 13cos30 ( I made up the numbers, can't remember the actual numbers)

Is that right or did u have to calculate it
You'd get method marks, if they award any. But I think you need the actual answer.
16. how many marks was the ratio question. I think i got that wrong but the others seem fine though. So glad there aren't any questions about experiment procedures
17. (Original post by mathphysics)
What did people get for the question with the Force (R) and Force (F) of the water droplet on the window. (8.0*10-5N)

i put 1.6 or something then scribbled it out and put 4.2 or something
i put it was the same as the component of the weight down the slope/parallel to the slope since the raindrop is stationary
18. (Original post by MikeyP96)
i did youre trolley one was the same as mine

woop! although looking at teachercol's post has dampened my spirits lol
19. Has anyone got a electrical copy of the paper???
20. does it matter if you leave the ratio as 1.73/0.63? not sure if they were the right numbers

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