AQA Physics A Unit 2 5th June 2009 [New Spec]

Haruhi

Yes I know! But I am surely not gonna lose 29 marks O___O I think I lost about 15 xD
O well resetting it next year :biggrin:

Losing 15 will be an A lol... :rolleyes:

Why resit?

Reply 182

ahh bugger, I wrote "the energy stored in the stretched cord as elastic strain energy, which is the same as the work done to stretch it", but its not - because some energy is lost, as the unloading curve shows. I will probably lose the marks, for the wrong part of my answer

Reply 183

adamavfc

***Hannah***

Cool.

I wrote that... :smile:

i think i put energy stored :confused:

Reply 184

Mr. Tizzy XII

12

MarcusTheEskimo

Or just use n=3 and you get a sinx value greater than 1, which never happens.

Phew! Thanks for posting that - i did the same and thought i may have made a mistake because no-one was mentioning it :awesome:

Reply 185

Haruhi

***Hannah***

Losing 15 will be an A lol... :rolleyes:

Why resit?

Thats me... I say I lost 15 and I end up losing 50. lol @ me trying to get my hopes up xD

I literally just revised the night before so yea... total failure.

Reply 186

adamavfc

i think i put energy stored :confused:

Initially I thought my answer was wrong and yours was correct.

But then somebody told me I was right and gave me an explanation and I trusted them.

Ask who ever told me it's Work Done in this thread...

Reply 187

Ahmed_7

***Hannah***

Cool.

I wrote that... :smile:

I wrote the its the Elastic potential energy, F1/2 Delta L. It's kinda the same as work done, would i get the mark?

As for the significant figures, you lose 1 mark for the whole paper if SF aren't used and 12 marks for no units. According to my teacher.

Reply 188

Ahmed_7

I wrote the its the Elastic potential energy, F1/2 Delta L. It's kinda the same as work done, would i get the mark?

As for the significant figures, you lose 1 mark for the whole paper if SF aren't used and 12 marks for no units. According to my teacher.

So even if like 5 of them are not 3 s.f I only lose 1 mark?

That's quite good... :smile:

And I am not sure, you could possibly get a mark for Epot, again depends on the examiner and if the mark scheme says allow this and allow that.

Reply 189

how many sig figs did you put for the time to reach the top of the liquid, where it said specifically you will be marked for sig figs??

I put 2, as all the data in the question was to 2 sf

Reply 190

Mr Nonsense

how many sig figs did you put for the time to reach the top of the liquid, where it said specifically you will be marked for sig figs??

I put 2, as all the data in the question was to 2 sf

On some I put a suitable number on some I left the answer like 43969547.1... :confused:

Reply 191

MarcusTheEskimo

For the phase difference I used 2pid/lambda

That equalled 2x0.5pi/0.4

Which equals 2.5pi or 450 degrees.

Is that correct?

Reply 192

MarcusTheEskimo

Oh and for the area under the curve - I put the stored elastic energy, but that sounds wrong.

Reply 193

MarcusTheEskimo

For the phase difference I used 2pid/lambda

That equalled 2x0.5pi/0.4

Which equals 2.5pi or 450 degrees.

Is that correct?

Nope sorry it was pii/2 or 90 degrees.

Reply 194

MarcusTheEskimo

Oh and for the area under the curve - I put the stored elastic energy, but that sounds wrong.

I put work done and somebody on here said that's correct.

I'm not sure of the answer, it could be both of them.

Reply 195

***Hannah***

I put work done and somebody on here said that's correct.

I'm not sure of the answer, it could be both of them.

I did it both ways, and you get the same answer either way.

In fact, the work done is a better method :yep:

Reply 196

how many marks do you think you can afford to lose on this paper and still get 120 UMS?

Reply 197

Ahmed_7

It would probably say: Work done. (accept elastic potential)

Unless they are totally different things?

Reply 198

Mr Nonsense

how many marks do you think you can afford to lose on this paper and still get 120 UMS?

Maybe 1-2.

I think an A will be anything from 50-53.

Reply 199