Year 12s: what will be the first way you research your future options? >>

OCR Modelling Physics June 4th 2018

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Reply 80

aliengamerx

how were you supposed to know that the wind turbine did one rotation every second, it didn't say that anywhere

Reply 81

Christina121

What did people get for the velocity question where you also had to calculate the uncertainty?

Reply 82

Neutronhole

for the helium one, I said that in the early stages the temperature of the earth was greater, and so more particles had the required kinetic energy to escape.
because the earth has cool downed particles no longer have kept

Reply 83

Tainer

Original post by Christina121

What did people get for the velocity question where you also had to calculate the uncertainty?

Correct answer was 42 +- 3 ms^-1, I got 84 because I didn't read diameter :'(

Reply 84

O11ie123

Original post by Alyssa134

Would anyone be able to tell me what the last question was worth? I didn't find the paper necessarily hard but I struggled with time. I'd like to know how many marks I lost by not even glancing at qu.23.

There was 24 questions I think and the last 2 were about 15 -20 marks I believe

Reply 85

zeldor711

I'm going to be somewhat pessimistic and say (given that I found this years paper easier) that A* will be 84 and A will be 75.

Same here

Original post by zeldor711

I'm going to be somewhat pessimistic and say (given that I found this years paper easier) that A* will be 84 and A will be 75.

most people I've spoken to seemed to think it was harder, but tbh I suspect the grade boundaries won't change much as they didn't for AS last year overall, although the individual paper boundaries changed

Reply 88

UCAS and Chill

Original post by Bulletzone

Area = pi x r^2

But isn't that assuming it rotates once every second? I didn't think it specified the time period of the rotation.

Reply 89

Brian_Strugnell

What did people get for the Δλ using the Hubble's constant and red **** equation?

Reply 90

Bulletzone

Original post by Brian_Strugnell

What did people get for the Δλ using the Hubble's constant and red **** equation?

add 13nm to original Wavelength given

Reply 91

RhynieChert

Original post by UCAS and Chill

But isn't that assuming it rotates once every second? I didn't think it specified the time period of the rotation.

the area in the given equation was the area of the wind turbine so yes it is π r^2 but I did think it wasn't particularly clear

Reply 92

Kppppp

what did people put for the "" feature of black hole? ""
i initally put "infinite density" but then i was paranoid i remembered it wrong, and put instead that theres no escape velocity

Reply 93

Kppppp

Original post by zeldor711

I'm going to be somewhat pessimistic and say (given that I found this years paper easier) that A* will be 84 and A will be 75.

i agree tbh
tho, i thought it was pretty much the same level of difficulty as last years
at least there were few weird/obscure questions

Reply 94

RhynieChert

Original post by Kppppp

what did people put for the "" feature of black hole? ""
i initally put "infinite density" but then i was paranoid i remembered it wrong, and put instead that theres no escape velocity

I said gravitational field so strong even light cannot escape after event horizon, pretty sure your answer is fine

Reply 95

UCAS and Chill

Original post by aesthete1

the area in the given equation was the area of the wind turbine so yes it is π r^2 but I did think it wasn't particularly clear

Oh wow okay that makes sense, do you remember if it was a 2 or 3 marker?

Reply 96

Brian_Strugnell

Original post by Kppppp

what did people put for the "" feature of black hole? ""
i initally put "infinite density" but then i was paranoid i remembered it wrong, and put instead that theres no escape velocity