AQA A Physics Unit 4 24th Jan 2012

Yeah, I think the answer is that because the bungee no longer has tension, the girl is moving (accelerating and displacing) due to gravity and she is in freefall and therefore the acceleration is no longer proportional to the displacement so she is no longer in SHM.

Surely current should have been obtained by using the gradient as the question before asked what the gradient was representing...

it was D, that it explains how different factors affect the force of gravity between objects (such as mass and distance between them)

They gave us everything needed for V = IR tbh...

EXACTLY what I put

Thank god someone else said that. After reading people's ideas on here I started to think the first question said 'which is incorrect' but I'm almost certain it said which is correct.

Also agree with both of these.

This maybe stupid but for multi choice what was the answer to th elastic collision one? was is 0 for the initial moving ball and v for the initial stationary one?

Also for the "which one of these can't be a unit for E?" was it the 2nd option, the really long one?

If these are right then I'm good for 25

This maybe stupid but for multi choice what was the answer to th elastic collision one? was it 0 for the initial moving ball and v for the initial stationary one?

Also for the "which one of these can't be a unit for E?" was it the 2nd option, the really long one?

If these are right then I'm good for 25

Agree on first but your second point...

Weren't there two options: JC-1m-1 and JCm-1?

I remember the first one being A and the second being D and I deduced that one of them must be wrong and I thought its D.

Agree on first but your second point...

Weren't there two options: JC-1m-1 and JCm-1?

I remember the first one being A and the second being D and I deduced that one of them must be wrong and I thought its D.

The answer to the unit one was B or C as A and D were definitely possible. I think I put C

The answer to the unit one was B or C as A and D were definitely possible. I think I put C

What did you get for your current btw? And I agree with your multi choice answer the the Shm bit.

Agree on first but your second point...

Weren't there two options: JC-1m-1 and JCm-1?

I remember the first one being A and the second being D and I deduced that one of them must be wrong and I thought its D.

I remember the two options I put here being there and the second one is definitely wrong... I swear it was option D tough.

C was definitely possible that was the one I worked out. It was the one with newtons in it i think

Can't honestly remember, I just feel like I used data in the question if I remember correctly.



and I also put D I believe (if memory serves me correctly ). Just simple dimensional analysis really, changed formulas around to give each of those units and the only one I couldn't get was D I think. It was JCm-1 I think. Wikipedia says " kg·m·s−3·A−1" is standard SI. jC-1m-1 must be right as it is NC^-1, and Newtons = joules per metre.

I think I put B then. I thought D worked hmm..
And ah ok I used the gradient

I think I put B then. I thought D worked hmm..
And ah ok I used the gradient

In fact I may be thinking of a different question. For the question I believe you're talking about (finding the maximum current) I did certainly use the gradient (near the origin). I thought for that question it said 'use the graph to show' I remember vividly because my teacher stresses crazily about 'use the graph' questions and I remembered his voice when I saw it haha.