Edexcel Physics Unit 4 - 21st June 2011

hahaha i like the way u think

Haha. It is true. I am sure that is their mission. Well, they seem to be succeeding here.

thank you! i think i love u right now!

Extremely tough paper.

Realised I got one of the Spread sheet answers but crossed it out for some reason!?
Couldn't determine the "u" thing either.
Probably dropped a few on the multi choice and forgot 0.5mv^2=mgh (damn!)

The V/t graph, talked about how it becomes charged when touching one plate, and accelerated through the field to the next plate, where its charge will change, and accelerate in the other direction (carbon a conductor, electric field, stuff lol)

The particle physics at the end was very nice. Probably the best question on the paper.

Charge Conserved
Momentum Conserved
Baryon Number Conserved (all mesons, so... Baryon number is conserved!)

I think I got the rest pretty well down, but you never know really. Thinking roughly anywhere from 45-62 marks for me!

First multi choice question I think was weight, simply because the definition on newtons second law is "the rate of change of momentum of an object is directly proportional to the resultant force that acts on the object"

Took a wild guess at the flux linkage.

how were we supposed to show the height was 0.8 in that
question about the racket and the ball?

Am I the only one that found that paper a piece of cake??

Am I the only one that found that paper a piece of cake??

"Question 18 continues on the next page" kind of gave it away for me...

It was inelastic for me .. even though they were very close to be equal .. they werent actually equall ...

1/2mv^2 = mgh

I felt it was a much harder paper, but think I did better then I did in Jan

I hate jelly now

the spreadsheet question was hard

the capacitance one I did that wrong, and the very first formula I didn't prove in time

Really liked the last question

the collisions one, I might have dropped 3 marks

The V/t graph, I only got it at the end, spoke about acceleration of the field and when it's going back the force opposing the force, therefore a deceleration

overall, boundaries will drop

for an A* I think 55/56

For preventing the ion from moving vertically, what did you guys write?
I wrote that the force from the electric field balances its weight ( which I'm pretty sure is wrong )

But the mass of the ball and the racket was not given. Or were we to assume they were equal?

I felt it was a much harder paper, but think I did better then I did in Jan

I hate jelly now

the spreadsheet question was hard

the capacitance one I did that wrong, and the very first formula I didn't prove in time

Really liked the last question

the collisions one, I might have dropped 3 marks

The V/t graph, I only got it at the end, spoke about acceleration of the field and when it's going back the force opposing the force, therefore a deceleration

overall, boundaries will drop

for an A* I think 55/56