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# OCR Physics A G481 Mechanics - 17th May Tweet

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1. OCR Physics A G481 Mechanics - 17th May
How did everybody find it?
2. Re: OCR Physics A G481 Mechanics - 17th May
Not too bad, apart from my mind went blank for the last question about turbines. -_-
3. Re: OCR Physics A G481 Mechanics - 17th May
(Original post by billybluehat)
I'm so confused i dont know whether ive done well or not! Did anyone make the radius 9.96 or something like that for the wind turbine question?
Yep I got 9.99 so rounded it up to 10 metres
4. Re: OCR Physics A G481 Mechanics - 17th May
yess! haha do you know if anyone will put up any answers at some point? im eager to know how ive done!
5. Re: OCR Physics A G481 Mechanics - 17th May
is there an unofficial markscheme? can someone please make one, i would but i cannot remember all the questions!
6. Re: OCR Physics A G481 Mechanics - 17th May
I'll post one up later - I've done the paper.
7. Re: OCR Physics A G481 Mechanics - 17th May
the acceleration downwards is horizontal component of g,because resultant force is horizontal component of weight. so g*sinθ=acceleration.we already got the acceleration from previous part.
8. Re: OCR Physics A G481 Mechanics - 17th May
Can someone make an unofficial markscheme please?
9. Re: OCR Physics A G481 Mechanics - 17th May
does anyone have unofficial mark scheme
10. Re: OCR Physics A G481 Mechanics - 17th May
(Original post by teachercol)
I'll post one up later - I've done the paper.
will you post it tonight or something???
11. Re: OCR Physics A G481 Mechanics - 17th May
is this the correct rule for sig figs (in OCR A-Level Physics exams):

Put your final answers to the same sig figs as the values given in the question are i.e. 10.0m(3sf) for the radius question because of the 1030 density (3sf)

Also, if the sf varies throughout given data, do you use largest sf or smallest that is given in question?

Thanks

Just started worrying about it as I suddenly realised I was not sure about the rule
12. Re: OCR Physics A G481 Mechanics - 17th May
(Original post by oh_1993)
is this the correct rule for sig figs (in OCR A-Level Physics exams):

Put your final answers to the same sig figs as the values given in the question are i.e. 10.0m(3sf) for the radius question because of the 1030 density (3sf)

Also, if the sf varies throughout given data, do you use largest sf or smallest that is given in question?

Thanks

Just started worrying about it as I suddenly realised I was not sure about the rule
When looking at past mark schemes I don't think they take marks off you if you have the right answer I don't see why they would also in mark schemes they seem to give a few answers to different s.f so it should be ok
13. Re: OCR Physics A G481 Mechanics - 17th May
Doesn't sound like I did too good. People keep mentioning figures that don't ring any bells to me..
I got a C the first time round so I may have to settle with that..
14. Re: OCR Physics A G481 Mechanics - 17th May
(Original post by HarryW95)
Doesn't sound like I did too good. People keep mentioning figures that don't ring any bells to me..
I got a C the first time round so I may have to settle with that..
Saaame with me , but i think i can improve on this one , defoo got c , probs b , but certainly not a...
15. Re: OCR Physics A G481 Mechanics - 17th May
Easy exam, all that revision paid off. That D i got in january scared me into me having no social life and just revising lol. But yeh, the exam was really good, dont think i dropped many marks at all
16. Re: OCR Physics A G481 Mechanics - 17th May
(Original post by patterson)
will you post it tonight or something???
Here it is

http://www.thestudentroom.co.uk/show...2#post37614962
17. Re: OCR Physics A G481 Mechanics - 17th May
(Original post by etta)
When looking at past mark schemes I don't think they take marks off you if you have the right answer I don't see why they would also in mark schemes they seem to give a few answers to different s.f so it should be ok
Yes, I think the sf in mark schemes vary because of the sf given in the questions. They only take off 1 mark in the whole paper though for being too accurate apparently.
18. Re: OCR Physics A G481 Mechanics - 17th May
Does anyone have the paper? The G481 May 2012 paper??? If anyone can get a hold of it...I love you
19. Re: OCR Physics A G481 Mechanics - 17th May
Sorry to interrupt and ask a relatively unrelated question but:

For moments if there is one pivot I'm fine, two pivots with two unknowns I'm also fine. But could there ever be a question with two pivots but one unknown?

Thanks.
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