OCR Physics A G484 Jan 2012 - The Newtonian World

i don't think they were to be honest - the first two were...but the last one was when potential energy is a minimum...isn't potential energy a minimum when the oscillation is at its lowest ie. at -0.4m?

I put about the heat being lost from the air to the surroundings, like the greenhouse walls, and I also said that the rate at which thermal energy is released by the soil, will diminish over the hour after the sun has gone down,

I'm quite confident with that, as I feel that's why they involved the phrase '12W immediately after sunset' in the question

i don't think they were to be honest - the first two were...but the last one was when potential energy is a minimum...isn't potential energy a minimum when the oscillation is at its lowest ie. at -0.4m?

potential energy is lowest where heigh is lowest, AHHHHHHHHHH was it a pendulum or a spring ? DIDN'T THINK

Answers posted in new thread.

No, i thought 2 were on zero, but the max acceleration is at max displacement... because acceleration is proportional to displacement... so acceleration is zero at the equilibrium point... so the other point was at a max displacement point

What did people get for the temperature increase of air by the soil in the greenhouse? I think i got something like 2.42 k

Yeah that's what I thought too.

I put about the heat being lost from the air to the surroundings, like the greenhouse walls, and I also said that the rate at which thermal energy is released by the soil, will diminish over the hour after the sun has gone down,

I'm quite confident with that, as I feel that's why they involved the phrase '12W immediately after sunset' in the question

after reading teachercools mark scheme i kick my self for not writing collision per unit time and for not talking about force.
But this is annoying i swear that question came up before and had different answers.

Did anyone else think that that was quite a hard paper, in comparison to other papers?

I though there was a lot of wordy questions and not as many calculations involved which was a disappointment.

YES! I hated some of the 1/2 mark awkward wordy questions :s

Did anyone else think that that was quite a hard paper, in comparison to other papers?

I though there was a lot of wordy questions and not as many calculations involved which was a disappointment.

Yeah, I thought it was pretty bad in comparison to all the past papers I did.
All the wordy questions were terrible. I always have problems remembering exact definitions of stuff to the more wordy questions aren't my strong point!

I also lost a silly mark on the linear momentum question... I put mass x velocity. Then added 'in the direction of travel' on the end because I thought 'mass x velocity' didn't sound enough to get the mark. 1 silly mark gone

Ah. Im just hoping for an A!!!

But I guess that kinda slim!

I got all the proofs though So was kinda happy!!!

I'm sure you did fine!

I hope for an A too... after seeing the unofficial markscheme teachercol put up I'm slightly more convinced I did okay. There are just a few questions I either can't remember what I got or put similar and don't know if I would have got the marks for it. Depends on how lenient OCR's mark scheme and the person marking it is
We'll see in March.

...why can't results day be now

I know the feeling!!!! Really want to find out now. Im a little bit more convinced looking at the markscheme, but still dont want to be optimistic, as the OCR mark schemes can be soo horrible!!!!

Have you done any other exams?