# AQA PHYA4 ~ 13th June 2013 ~ A2 PhysicsWatch

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6 years ago
#441
transformers also hasnt come up for a while!
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6 years ago
#442
(Original post by fuzzybear)
unit 7 is eletromagnetic fields stuff

is cyclotron actually stated in the specification? I can't see it
Yeah http://filestore.aqa.org.uk/subjects/AQA-2450-W-SP.PDF

Check page 17 out under moving charges in a magnetic field, the last sentance in that little section.
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6 years ago
#443
If Cyclotron comes up as the 6 marker i'm screwed
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6 years ago
#444
(Original post by Dirtybit)
Yeah http://filestore.aqa.org.uk/subjects/AQA-2450-W-SP.PDF

Check page 17 out under moving charges in a magnetic field, the last sentance in that little section.

(Original post by Dirtybit)
If Cyclotron comes up as the 6 marker i'm screwed
"Circular path of particles; application in devices such as the cyclotron." - that to me says that there will be questions set in the context of a cyclotron, not that you need to explain what one is or how they work etc. So harness those doubts and turn it into positive energy. Yeah? YEAH? OK.
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6 years ago
#445
(Original post by kingm)
You're using an unnecessary formula. If something is to appear weightless then weight (mg) = centripetal force.

So: mg = m(w^2)r
and you know that w^2 is (2pi/T)^2 which you can then rearrange to get T.

Don't forget to square root your answer and then divide by 3600 to get into hours, otherwise you'll work yourself into a sweat like I did 30 seconds ago .

Thank you so so so much! That really helped
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6 years ago
#446
Anyone know any good experiments for shm and damping aswell
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6 years ago
#447
Good luck for tomorrow guys
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6 years ago
#448
(Original post by kingm)
"Circular path of particles; application in devices such as the cyclotron." - that to me says that there will be questions set in the context of a cyclotron, not that you need to explain what one is or how they work etc. So harness those doubts and turn it into positive energy. Yeah? YEAH? OK.
Well if you think it won't come up then it wont since you "paid alot of money"
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6 years ago
#449
(Original post by The H)
Good luck for tomorrow guys
The exam's in the afternoon right?
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6 years ago
#450
(Original post by Dirtybit)
The exam's in the afternoon right?
Yeah 1:30
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6 years ago
#451
(Original post by Dirtybit)
Well if you think it won't come up then it wont since you "paid alot of money"
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6 years ago
#452
(Original post by saba146)
transformers also hasnt come up for a while!
Yes! You reckon it will be, What colour was Optimus Prime? Or what sort of car is Bumblebee?
2
6 years ago
#453
Wait, this is tomorrow?
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6 years ago
#454
(Original post by WeNeverWinAtHome)
Yes! You reckon it will be, What colour was Optimus Prime? Or what sort of car is Bumblebee?
mmmmm Megan Fox.
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6 years ago
#455
(Original post by WeNeverWinAtHome)
Wait, this is tomorrow?
Nope, it's today.
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6 years ago
#456
(Original post by Dirtybit)
Nope, it's today.
Oh Christ.
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6 years ago
#457
(Original post by kingm)
mmmmm Megan Fox.
You seen the recent one? The new girl is proper fit.
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6 years ago
#458
(Original post by UnknownOrigin)
Well I'd just say:

-Two metal plates separated by an air gap, connected to a battery
-Electrons flow onto one of the plates, consequently causing electrons on the opposite plate to be repelled off, causing the other plate to become positively charged
-As the charge grows, the flowing electrons are repelled by the negative plate, causing the current in the circuit to drop
-When the PD across the two plates = the PD of the battery, no more current flows leaving two plates, one with a +Q charge, and one with a
-Q charge

edit: so yeah you pretty much got the idea of it
It's not always an air gap. It's any insulator for that specific capacitor, it's called a 'dielectric' that is assigned a maximum voltage (working voltage) that it can work within without melting or getting ruined.
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6 years ago
#459
Good luck tomorrow(today) guys! My brain is fried, need some sleep!! Hope it's an easy 6 marker and lots of 'show that' questions.
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6 years ago
#460
lots of further mechanics questions.. man im screweed......
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