OCR Physics B - Rise and fall of the clockwork universe - 28th Jan

where did you get the stiffness constant from?

where did you get the stiffness constant from?

There were some weeiirdd questions on this paper, but I think it went OKish.

For the astronaut one though, I swear it contradicted itself! In the question, it said she was being propelled away from the spacecraft (I think), but the diagram had the gas coming out of the back of her booster pack, and so she'd be propelled towards it!
I did it according to the diagram ('cause I never read the questions, and didn't actually realise until the end of the paper), so I got a velocity of like.. 4. something, therefore a relative velocity of 1. something away from the spacecraft? However, some people did it the other way, and got a velocity of like 10?

Meh. The grade boundaries will be loowww - for both the AS papers last year it was ~60% for an A, and I think this paper was definitely harder than the AS ones (comparatively of course, considering A2 is harder anyway).

I took 5 exams this jan. 3 went great, 1 was alright. then comes physics and screws it up. !

I did all the past papers and the specimen paper even did not suggest anything too difficult with applications of such like we had in that exam.
Since its the new spec i guess they make it hard. Well i think il be resitting this, i can just feel it

Really!? Did you miss a page or just do everything double time lmao, i did my calculations twice the first time round... but that only takes like 5 min extra!

There were some weeiirdd questions on this paper, but I think it went OKish.

For the astronaut one though, I swear it contradicted itself! In the question, it said she was being propelled away from the spacecraft (I think), but the diagram had the gas coming out of the back of her booster pack, and so she'd be propelled towards it!
I did it according to the diagram ('cause I never read the questions, and didn't actually realise until the end of the paper), so I got a velocity of like.. 4. something, therefore a relative velocity of 1. something away from the spacecraft? However, some people did it the other way, and got a velocity of like 10?

Meh. The grade boundaries will be loowww - for both the AS papers last year it was ~60% for an A, and I think this paper was definitely harder than the AS ones (comparatively of course, considering A2 is harder anyway).

What about the question where you had to get 1000ms-1 for the velocity of the moon's orbit?--I couldn't get that value despite sitting there for 10 minutes using all the equations I could think of. I know it's probably really simple and I'll be kicking myself when I find out but...oh well.
Also, another stupid question, I thought the units for momentum were Kgms-1 but that wasn't an option in the first questions so I wrote it down and then circled it...no marks for me there!

What about the question where you had to get 1000ms-1 for the velocity of the moon's orbit?--I couldn't get that value despite sitting there for 10 minutes using all the equations I could think of. I know it's probably really simple and I'll be kicking myself when I find out but...oh well.
Also, another stupid question, I thought the units for momentum were Kgms-1 but that wasn't an option in the first questions so I wrote it down and then circled it...no marks for me there!

I think i got the velocity one using v=wr, i dont remember the first question well, but it could have been Ns since F=mv/t...

Yeah, the second one's probably right but if you used v= wr then you must have calculated the angular velocity which you need the linear velocty and radius for, the latter which you were given but the first you didn't have...or did you? I'm confusing myself now! oh well...thank you anyway