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# A2 6PH04 Physics Unit 4 'Physics on the Move' - 11th June 2012 Watch

1. (Original post by d_94)
Here it is :]
thank you!
2. Hey ,, anyone here kind enough to explain to me a question..
There's a past year question regarding electromagnetic induction ...about the bicycle wheel and the spokes moving in a clockwise direction..

I'm not sure what year is it from,,

(i) Label the hub and rim either plus or minus to show the polarity of the e.m.f.

Answer is HUB "-" and rim "+"...

I don't understand that,,, if you use flemings right hand,,, don't you get otherwise?

Thanks for taking time to read
3. (Original post by lipton600)
Hey ,, anyone here kind enough to explain to me a question..
There's a past year question regarding electromagnetic induction ...about the bicycle wheel and the spokes moving in a clockwise direction..

I'm not sure what year is it from,,

(i) Label the hub and rim either plus or minus to show the polarity of the e.m.f.

Answer is HUB "-" and rim "+"...

I don't understand that,,, if you use flemings right hand,,, don't you get otherwise?

Thanks for taking time to read
Hope this helps.
Hope this helps.
Hello all,

I have a request. As the exam approaches, it is becoming really difficult to get over my exam nerves and concentrate on the revision. So I would like to revise with everyone who is interested. I am thinking of deciding a particular time at which everyone who is interested could come online together and we could discuss whatever we need to know for each specification point on the GCE Physics Specification. We did this last year on TSR and it helped a lot - I achieved almost full ums so it really did help a lot. In this way, whoever needs to ask doubts could be replied to immediately. Whoever is interested, please state a suitable time (in GMT) until tonight and we can decide a particular time which suits everyone.

This is for anyone who wants to find out what their local time is in GMT: http://wwp.greenwichmeantime.com/gmt-converter/

Good Luck!
5. How do you guys tackle the practical-related questions like:

Describe how you would use light gates and air track to investigate momentum/change in momentum.

Describe how you would investigate the effect of m,v and r of orbit on centripetal force.

Can someone suggest suitable investigations for these core practicals?
6. Can someone put up notes for hydrogen bubble chamber thingy ? please
7. (Original post by vampirerahim)
Can someone put up notes for hydrogen bubble chamber thingy ? please
Here you go (:
Attached Images
8. Principles of Detecting Particles.pdf (484.6 KB, 475 views)
9. (Original post by d_94)
Here you go (:
Thanks alot dude
i was really lookin for something like this
amazing stuff

thanks alot

REP UP !!!
10. Please can someone help me with these questions..
I've looked at the ms and it makes no sense

Attachment 155367

Here is the ms for the question

11. (Original post by vampirerahim)
Thanks alot dude
i was really lookin for something like this
amazing stuff

thanks alot

REP UP !!!

Welcomee (: Glad I could help
12. (Original post by d_94)
Here you go (:
Have you got more notes on particle detection?
13. (Original post by Jess!ca)
Please can someone help me with these questions..
I've looked at the ms and it makes no sense

Attachment 155367

Here is the ms for the question

I can't see the first attachment?
14. (Original post by M Kh)
Have you got more notes on particle detection?
No. Sorry. Just found this online.
I can't see the first attachment?
I'll try again:

16. (Original post by Jess!ca)
Please can someone help me with these questions..
I've looked at the ms and it makes no sense

Attachment 155367

Here is the ms for the question

Hi Jessica,
The first attachment isn't working, so if you edit that I'll try my best to help you!

From the mark scheme it looks like you're doing an OCR paper? In which case, as far as I'm aware for Edexcel, we don't need to know how capacitors work in series or parallel. So question B is obsolete and you don't need to know it.

Hope that helps! And if we do need to know how capacitors work in series, someone please correct me!

Hope that helps..
Z
17. (Original post by Ziviz)
Hi Jessica,
The first attachment isn't working, so if you edit that I'll try my best to help you!

From the mark scheme it looks like you're doing an OCR paper? In which case, as far as I'm aware for Edexcel, we don't need to know how capacitors work in series or parallel. So question B is obsolete and you don't need to know it.

Hope that helps! And if we do need to know how capacitors work in series, someone please correct me!

Hope that helps..
Z
Hey,

Yeah it is an OCR paper, because I've done every Edexcel paper there is up till 2010! So I was scouting for similar questions on other boards.

Thank you, that's reassuring but what got me was in the circuit in the question, two capacitors are in series, but the ms says that to work out total capacitance, you do 1/150 + 1/450... I thought that if it was in series, you just add 150 + 450 >_< So very confused..
18. Did everyone else know that in Jan 12 for this paper an A was 64% raw marks and an A* was 70%? i didnt realise they were so low
19. (Original post by Jess!ca)
Please can someone help me with these questions..
I've looked at the ms and it makes no sense

Attachment 155367

Here is the ms for the question

for the first part use the fact that the charge stored by capacitors in series is equal.

this translates to V(1)C(1)=V(2)C(2) mathematically

you also know that V(1)+(V2) = 6

so can easily solve that for V(1) or (V2) whatever you're after.

second part, real easy once you have first part Q = VC ....

last part, capacitors in series add up in the same way as resistors in parallel

i.e (1/C) = (1/C(1) + (1/C(2)) + ..............)
20. (Original post by Jess!ca)

the ms says that to work out total capacitance, you do 1/150 + 1/450... I thought that if it was in series, you just add 150 + 450 >_< So very confused..

when capacitors are in parallel you just add them, in series you must add them as reciprocals.

you can think of capacitors in circuits like you think of springs in mechanical systems if it seems counter intuitive, putting them in series is like putting springs end on end so the overall spring is actually EASIER to stretch out whereas if you put springs in parallel you can imagine it makes it harder to pull
21. (Original post by 584385)
Upload them in pdf format hope they work
These are gorgeous!
Do you have the notes for AS and the other units by any chance? would be so eternally grateful.

Updated: December 31, 2012
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