# OCR Physics A G485 - Frontiers of Physics - 18th June 2015Watch

3 years ago
#1741
(Original post by Lunox)
I also did this, but not sure if it is right!
you had to divide it by 1/60 as charge was only being dissipated for half the amount of time.
0
3 years ago
#1742
this was my last exam.
4
3 years ago
#1743
(Original post by Jamesowl)
you had to divide it by 1/60 as charge was only being dissipated for half the amount of time.
Yes but the switch flipped back and forth 120 times so if the method is correct (I don't know) then you would still multiply by 120 I think because charge is dissipated through the resistor 120 times per second as it completes a full oscillation 120 times per second.
0
3 years ago
#1744
(Original post by L'Evil Fish)
It would eventually fall to the ground, at first I wrote 'wobble' but then realised it would act with gravity making it fall

When it acts in opposite direction it would be in equilibrium

So eventually it'd get to surface of earth
Wait, I visualised it as an alternating p.d. in a high up power line which is obviously supported at both ends, and they just meant explain why the cable would sag as opposed to stay horizontal. Oh well, probably misinterpreted it.
0
#1745
(Original post by Elcor)
Wait, I visualised it as an alternating p.d. in a high up power line which is obviously supported at both ends, and they just meant explain why the cable would sag as opposed to stay horizontal. Oh well, probably misinterpreted it.
Oh yeah

Maybe I should have left it as wobble

Idk why I thought of it a floating line with a random AC
0
3 years ago
#1746
(Original post by Terry Tibbs)
Need the A*s for Manchester Physics, think they'll probably let me in with one A* though.
That's my offer too! Are you confident in 2 of the A*s?
0
3 years ago
#1747
(Original post by Terry Tibbs)
Need the A*s for Manchester Physics, think they'll probably let me in with one A* though.
They let me in on 3A's for mechanical engineering.
0
3 years ago
#1748
(Original post by Lunox)
Yes but the switch flipped back and forth 120 times so if the method is correct (I don't know) then you would still multiply by 120 I think because charge is dissipated through the resistor 120 times per second as it completes a full oscillation 120 times per second.
It told you that a full oscillation was just between A and B, I thought that at first but then I read the question again.
0
3 years ago
#1749
Found some parts pretty tricky. As someone who doesn't like ratios the sirius B and antares question was pretty hard... Definitely atleast 2 marks dropped in that question.

Overall I'm predicting about 74-75 for an A.

Any news on unofficial mark scheme?
0
3 years ago
#1750
Does anyone know if teachercoll is making an unofficial marlscheme?
0
3 years ago
#1751
(Original post by Jamesowl)
It told you that a full oscillation was just between A and B, I thought that at first but then I read the question again.
0
3 years ago
#1752
(Original post by Chung224)
Does anyone know if teachercoll is making an unofficial marlscheme?
(Original post by Damhuis95)
Found some parts pretty tricky. As someone who doesn't like ratios the sirius B and antares question was pretty hard... Definitely atleast 2 marks dropped in that question.

Overall I'm predicting about 74-75 for an A.

Any news on unofficial mark scheme?
Didn't l evil fish say he was making it?
0
3 years ago
#1753
(Original post by matthew6665)
Don't know why. But I hate when people 'cry' about not getting an A* lol
An A is amazing :s there is probably 40% that will get a C or a B :>
I need an A* to get into my firm choice uni. That's why.
0
3 years ago
#1754
(Original post by Elcor)
1.8x10^-3 I think...
0
3 years ago
#1755
(Original post by Jamesowl)
It told you that a full oscillation was just between A and B, I thought that at first but then I read the question again.
Oh well, fair enough probably only 1 mark, that is a bit misleading.. You would assume back and forth would count as an oscillation! Then again my fault for not being able to read
0
3 years ago
#1756
(Original post by The Room Student)
That's my offer too! Are you confident in 2 of the A*s?
In Physics I'd say so, not so much with Chemistry (F324 was a nightmare). And Maths I didn't see the damn last question on C3... hoping they'll let me in with one A* though.
0
3 years ago
#1757
(Original post by matthew6665)
Well I don't know which unis give such high offers.. 2 people I know are going Oxbridge and both have AAA offers :s So I guessed that ****ter unis will not have A* offers cause that's just mad.
My offer for physics from Manchester is A*A*A.

(Original post by Terry Tibbs)
Need the A*s for Manchester Physics, think they'll probably let me in with one A* though.
How come you think they will?
The only way I think I'll get in now is because my interview went well and I got an A in my EPQ, still not certain though :-( I hope they do I wanna go so bad

(Original post by The Room Student)
That's my offer too! Are you confident in 2 of the A*s?
Hi 5s
I'm very hopeful I managed the A* in maths but not in physics
0
3 years ago
#1758
(Original post by Jamesowl)
1.8x10^-3 I think...
Nice, same
0
3 years ago
#1759
(Original post by rachelc142)
How come you think they will? The only way I think I'll get in now is because my interview went well and I got an A in my EPQ, still not certain though :-( I hope they do I wanna go so bad
I remember on the tour before the interview someone said they'll probably let you off with one A*. They give offers to 80% of applicants which is quite high compared to other good Unis so it doesn't seem like they're that strict.
0
3 years ago
#1760
You 'hate when people cry about not getting an A*'? Many need A*s for their offers. Had I been accepted to Imperial I would certainly need an A* in Physics. My current uni lowered my required grade from an A* after firming them, but I'm still gutted that I likely won't get an A* in Physics (just found out how the grades work in the overall scheme)... C'mon man.
0
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