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

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.

Reply 1541

duncant

2

what were the numbers involved in the first multiple choice question and what was the answer?

Reply 1542

particlestudent

13

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.....

Reply 1543

Aethrell

2

was the answer to the momentum of the alpha particle 1e-12 kgms-1?

Reply 1544

particlestudent

13

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 :s-smilie:

Reply 1545

duncant

2

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 :s-smilie:

4.2 something?

Reply 1546

Euclidean

OP

11

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.

Reply 1547

liverpool2044

10

greatly appreciated if we could all try and chip in with q number for mc and answer
ill start

1 - about elastic - D

Reply 1548

Jay1421

2

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 :s-smilie:

If I recall correctly the answer was 3.6*10^7, I don't think it was A, sorry :frown:

Reply 1549

CourtlyCanter

8

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

Reply 1550

perpetua

7

Can I say for the disadvantage that the electrical energy is costly? What about the electron one when I said its mass is negligible

Reply 1551

ombtom

17

Original post by Jay1421

If I recall correctly the answer was 3.6*10^7, I don't think it was A, sorry :frown:

Yeah, you had to subtract the radius of Earth from the geostationary orbit (4.23x10^7) to give 3.6x10^7 metres.

(edited 7 years ago)

Reply 1552

Aethrell

2

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)

Reply 1553

KD1997

1

Original post by 1017bsquad

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?

Reply 1554

particlestudent

13

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 :frown:

Ah right, I think overall it wasn't that bad though (the multiple choice).

Reply 1555

KD1997

1

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

Reply 1556

palacefloor

2

Could someone please reply to this.

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?

Reply 1557

Jordenwilder1998

1

what did everyone put for the box tick question. i cant remember exactly what it was but could someone clarify

Reply 1558

Jordenwilder1998

1

what was the answer fopr the right angled triangle in the mc i put 3f

Reply 1559

smisocm

Original post by palacefloor

Could someone please reply to this.

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

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

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