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iGCSE EDEXCEL PHYSICS DISCUSSION 2012

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Its actually 0.009W for 10s.

Energy must be 0.009*10=0.09J?

I just put 780J anyways lol, but that is definetly wrong, it will most certainly be 0.009 or 0.09.

I got 0.0009W for 10s?

78/(24 x 3600)
and then that x10 is 0.009J?

Reply 301

Relaxedexams

Original post by Coco406

Was the question not just working out the pressure??

Yes, what was your answer for the question.

To find the pressure did you take the area as 0.0013 or half that since they said total surface area of coin was 0.0013.

Reply 302

Relaxedexams

Original post by Coco406

I got 0.0009W for 10s?

78/(24 x 3600)
and then that x10 is 0.009J?

Must be my mistake, I was using the calculator on my PC. Easy to make mistakes :angry:

Reply 303

Coco406

Original post by Relaxedexams

Yes, what was your answer for the question.

To find the pressure did you take the area as 0.0013 or half that since they said total surface area of coin was 0.0013.

I took the area as 0.0013, but forgot to multiply my end answer by 8 :frown:

EDIT: did you use half the area? If you were meant to then damn that's much too early in the paper for a trick question!

(edited 11 years ago)

Reply 304

Relaxedexams

Original post by Coco406

I took the area as 0.0013, but forgot to multiply my end answer by 8 :frown:

EDIT: did you use half the area? If you were meant to then damn that's much too early in the paper for a trick question!

You just had to multiply weight by 8, the area must be the one for one coin, since they were stacked on the table.

I used 0.0013 as well.

(edited 11 years ago)

Reply 305

AM.95

I got 222 Pa from 0.288/0.0013

Reply 306

lkj27

can anyone get the paper?

Reply 307

Relaxedexams

How many marks was that question for?

Reply 308

Relaxedexams

Original post by AM.95

I got 222 Pa from 0.288/0.0013

0.288 was the weight of one coin*8?
If so I got the same :biggrin:

Reply 309

AM.95

3 marks for that part of the question

Yeah

Original post by lkj27

can anyone get the paper?

Doubtful unless you ask your centre and they say yes, otherwise you will have to wait till christmas

Reply 312

Graceyfave

I am feeling so bad about this paper now -_- oh man.

This was posted from The Student Room's iPhone/iPad App

Reply 313

rtrtrt

Original post by Relaxedexams

Its actually 0.009W for 10s.

Energy must be 0.009*10=0.09J?

I just put 780J anyways lol, but that is definetly wrong, it will most certainly be 0.009 or 0.09.

1W of Power is 1J per second being transferred. Therefore, a 78W wind turbine transfers 78J of energy per second, meaning in 10 seconds it does transfer 780J

:smile:

Reply 314

ak2109

I definitely dropped some marks on the LED question and the car question with the two forces. :P Also on the last page bottom part I think. I definitely dropped marks on the 'show over 1300 fuel cells are needed' question.

Reply 315

AM.95

Original post by rtrtrt

1W of Power is 1J per second being transferred. Therefore, a 78W wind turbine transfers 78J of energy per second, meaning in 10 seconds it does transfer 780J

:smile:

Yes!!!

Reply 316

AM.95

Original post by Graceyfave

I am feeling so bad about this paper now -_- oh man.

This was posted from The Student Room's iPhone/iPad App

You probably get higher than you think, examiners a quite lenient so don't worry.

Reply 317

Coco406

Original post by rtrtrt

1W of Power is 1J per second being transferred. Therefore, a 78W wind turbine transfers 78J of energy per second, meaning in 10 seconds it does transfer 780J

:smile:

Makes sense, but it was a 3 mark question, and we had already stated the equation for the question above
I just don't understand why you would get 3 marks for 78x10

Reply 318

member963009

Original post by rtrtrt

1W of Power is 1J per second being transferred. Therefore, a 78W wind turbine transfers 78J of energy per second, meaning in 10 seconds it does transfer 780J

:smile:

THANK YOU!!!! It's no 0.00009 J or whatever people are saying -_- Is it jsut me or did you dread that paper and it turned out to be better than expected :biggrin:

Reply 319

AM.95

Original post by sahajkaur

THANK YOU!!!! It's no 0.00009 J or whatever people are saying -_- Is it jsut me or did you dread that paper and it turned out to be better than expected :biggrin:

Physics was the paper i was most scared for simply because of the poorly worded questions and the difficulty of questions in the past but the exam went miles better than i thought it would. They tested a lot of content, but at least all the questions were understandable and "you could have a go"