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# OCR-MEI M3: January 27th. watch

1. (Original post by joshkaye)
It was E.k(vertically below O) = E.k(at angle theta) - mgh. So it was -(1.25-1.25cos(theta)) = 1.25cos(theta) - 1.25.

I thought it was tough but just about doable. I thought Questions 3 was by far the hardest, part i and iv I was reasonably sure on but parts ii and iii confused me a bit. SHM was tricky as well but once I got the answers I'm pretty sure they're right because they fitted with the other parts of the question. Would be disappointed with less than 90%..
On that question I got the correct expression for v^2 but I got a minus instead of a plus! However, I just plugged a plus into my expression for height and everything seemed to work.

I'm thinking I probably lost about 7-9 marks in the whole paper. What did everybody get for the time in 4 (iv)? I got about 0.0127 or 0.127 seconds.
2. (Original post by OL1V3R)
On that question I got the correct expression for v^2 but I got a minus instead of a plus! However, I just plugged a plus into my expression for height and everything seemed to work.

I'm thinking I probably lost about 7-9 marks in the whole paper. What did everybody get for the time in 4 (iv)? I got about 0.0127 or 0.127 seconds.
I got a minus number for v2 for ages too!
And then in the end, it all just worked out.
(I think I had forgotten to resolve the weight or something like that).

I think I got something similar to the second figure on 4iv, but I can't really remember, it just feels about right!
3. Cool, I'm still regretting why I didn't take moments properly in the centres of mass question! How many marks might I lose for adding the two coordinates together and multiplying by the weight (for the clockwise moment of the weight about B)? Might I still get a couple of method marks?

Also, did you get something like 434 Nm^-1 for the stiffness in 1 (b)?
4. (Original post by OL1V3R)
Cool, I'm still regretting why I didn't take moments properly in the centres of mass question! How many marks might I lose for adding the two coordinates together and multiplying by the weight (for the clockwise moment of the weight about B)? Might I still get a couple of method marks?

Also, did you get something like 434 Nm^-1 for the stiffness in 1 (b)?
That number sounds vaguely familiar!
5. (Original post by placenta medicae talpae)
That number sounds vaguely familiar!
YES!

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