AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread]Watch

2 years ago
#1541
(Original post by Hattie28)
For the limitation I put dampening due to air resistance? Also on the MC, for the pendulum which one would have the largest amplitude? Overall I found section B okay, but the MC tricky.
I put the one with the same length as the driver since it would resonate. B if I'm not mistaken.
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2 years ago
#1542
what were the numbers involved in the first multiple choice question and what was the answer?
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2 years ago
#1543
If my momentum formula V was completely wrong (as I thought N was the mass of the original) how many marks would I get for the kinetic energy one? Which I couldn't even prove but done loads of working.....
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2 years ago
#1544
was the answer to the momentum of the alpha particle 1e-12 kgms-1?
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2 years ago
#1545
What did you guys get for the question about the height above the surface of the Earth on like q11 or 13 of MC? I ran out of time so I just done A
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2 years ago
#1546
(Original post by particlestudent)
What did you guys get for the question about the height above the surface of the Earth on like q11 or 13 of MC? I ran out of time so I just done A
4.2 something?
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#1547
(Original post by Blackmagic123)
old momentum = 0
new momentum = 0
VN+mv=0
because the value of v and V already account for the different directions.
but the mark scheme will probably not care
V is not a magnitude, it said Velocity V
That's just because they don't want to use vector notation in A-Level physics. The velocity V acts in the direction < but has magnitude V. They've told you this by the diagram.

(Original post by DesignPredator)
It did say velocity I agree, BUT the arrows were in opposite directions!
^ Exactly.
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2 years ago
#1548
greatly appreciated if we could all try and chip in with q number for mc and answer
ill start

1 - about elastic - D
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2 years ago
#1549
(Original post by particlestudent)
What did you guys get for the question about the height above the surface of the Earth on like q11 or 13 of MC? I ran out of time so I just done A
If I recall correctly the answer was 3.6*10^7, I don't think it was A, sorry
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2 years ago
#1550
(Original post by tanyapotter)
what did people get for the one with the right angled triangle in a gravitational orbit?
I think I put 4F. Used F= Gm1m2/r^2
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2 years ago
#1551
Can I say for the disadvantage that the electrical energy is costly? What about the electron one when I said its mass is negligible
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2 years ago
#1552
(Original post by Jay1421)
If I recall correctly the answer was 3.6*10^7, I don't think it was A, sorry
Yeah, you had to subtract the radius of Earth from the geostationary orbit (4.23x10^7) to give 3.6x10^7 metres.
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2 years ago
#1553
(Original post by CourtlyCanter)
I think I put 4F. Used F= Gm1m2/r^2
The distance between then was sqrt(5) so the Force would be 1/5 of the force felt when they were closest together, giving an answer of 5F

(I think)
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2 years ago
#1554
beta releases anti neutrinos which take away some of the energy
I don't know what the right answer is, but what I wrote was that the electron produced will travel at high speeds , electrons are of incredibly small mass, so i said the electron will act as a wave

I thought the thing with the neutrinos but isn't that still applicable to the formula because the two products still carry away all of the energy in the form of ke?
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2 years ago
#1555
(Original post by duncant)
4.2 something?
(Original post by Jay1421)
If I recall correctly the answer was 3.6*10^7, I don't think it was A, sorry
Ah right, I think overall it wasn't that bad though (the multiple choice).
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2 years ago
#1556
(Original post by liverpool2044)
greatly appreciated if we could all try and chip in with q number for mc and answer
ill start

1 - about elastic - D
that's correct. I would help but i don't think i got them all right and i don't remember what question was for which number
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2 years ago
#1557

For the first question the value of the resistor and time constant depended on the capacitor from the previous graph, so I worked all these out. However when I checked through I looked at the graph and worked out the capacitor to be very slightly different, will I drop any marks for not re-correcting the time constant and resistor or will it be fine?
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2 years ago
#1558
what did everyone put for the box tick question. i cant remember exactly what it was but could someone clarify
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2 years ago
#1559
what was the answer fopr the right angled triangle in the mc i put 3f
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2 years ago
#1560
(Original post by palacefloor)

For the first question the value of the resistor and time constant depended on the capacitor from the previous graph, so I worked all these out. However when I checked through I looked at the graph and worked out the capacitor to be very slightly different, will I drop any marks for not re-correcting the time constant and resistor or will it be fine?
There will be a range you can have. I had worked it out as 25/3
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