OCR Physics A G484: 20th June 2016

Can someone explain 2bii

https://6d58568f77fa37b9c685ab8ce9288964213d5667.googledrive.com/host/0B1ZiqBksUHNYa2QzN0x6TnYyWU0/June%202012%20QP%20-%20Unit%204%20OCR%20Physics%20A-level.pdf

It's basically when the acceleration of the plate when it moves downwards is faster than free falls (9.81ms-2) so when the plate moves down faster than the particles ontop can fall then they will lose contact for a brief time

Reply 41

Brokensteps

3

Make sure you remember the Joules->W->KWh conversions. I didnt find it in the textbook in this unit but it shows up in the papers

Reply 42

Tizzydag

3

do we need to know : change in energy= mass* specific latent heat
ive never seen it come up

Reply 43

Stahri

Anyone know what experiments could possibly come up in the paper?

Reply 44

FailedPhysics15

2

Anyone got the 2015 past paper?

Reply 45

Reda2

14

Original post by Stahri

Anyone know what experiments could possibly come up in the paper?

I think the specific heat capacity is coming up. It's on the 2014 June paper if you want to know it.

Mass of S2 - go!

That was not bad for me apart from that ****ING alphabet question, pisses me off! I almost lost all those marks. But that was not a normal paper, although they were all answerable but literally NO easy questions, even defining internal energy was hard.

For the energy of the pellets, did you guys do mgh * 50? or what did you do to get the E for the specific heat capacity.

And for the forces similarity I said,
- Same magnitude, same type of force
- Opposite direction, does not act on the same object.

Who agrees??

For the Kepler's law question, I did T²/r³ = T²/r³, right?

For the first question for the first part where you had to get speed. I did I = Ft, and then I = change in momentum to get speed. For the next part I used SUVAT, but last part of that question, finding the height I could not do, I tried but got 7m which is the initial height, and it can't be that.

Let me know what you guys did, and what you did for those questions.

(edited 7 years ago)

Reply 48

Mathematicus65

9

Original post by Reda2

That was not bad for me apart from that ****ING alphabet question, pisses me off! I almost lost all those marks. But that was not a normal paper, although they were all answerable but literally NO easy questions, even defining internal energy was hard.

For the energy of the pellets, did you guys do mgh * 50? or what did you do to get the E for the specific heat capacity.

And for the forces similarity I said,
- Same magnitude, same type of force
- Opposite direction, does not act on the same object.

Who agrees??

For the Kepler's law question, I did T²/r³ = T²/r³, right?

All correct

Reply 49

cookie_raider01

2

Original post by Reda2

...

yes for kepler's law you do that..
specific heat capacity you times 1.2 by 50 and find gpe
then use formula to find c
messed up last question so bad though

Reply 50

Reda2

14

For the first question for the first part where you had to get speed. I did I = Ft, and then I = change in momentum to get speed. For the next part I used SUVAT, but last part of that question, finding the height I could not do, I tried but got 7m which is the initial height, and it can't be that.

Anyone?

Reply 51

AlexeiLipov

5

Original post by anonymous_veg

Mass of S2 - go!

Something x10^33??

Reply 52

Reda2

14

Original post by cookie_raider01

yes for kepler's law you do that..
specific heat capacity you times 1.2 by 50 and find gpe
then use formula to find c
messed up last question so bad though

1.2 was the height right?

Reply 53

oinkk

3

Very heavy on the maths this year. All in all a very fair and nice paper. Nothing too crazy IMO. The impulse question (at least I hope it was an impulse question!) threw me a little.

Reply 54

Reda2

14

Original post by cookie_raider01

yes for kepler's law you do that..
specific heat capacity you times 1.2 by 50 and find gpe
then use formula to find c
messed up last question so bad though

I was doing the last question as the time ended, I got to the part where I'm putting the values in the calculator. Due to not having time, I wrote R instead of the actual value, do you think that will cost me the mark?

Reply 55

Reda2

14

Original post by AlexeiLipov

Something x10^33??

How did you do that question?

Reply 56

AlexeiLipov

5

How did people do the KE graph? Was your max KE at 50? And start from 0?

Reply 57

AlexeiLipov

5

Original post by Reda2

How did you do that question?

Not sure if it's right but I used Kepler's third law equation, we know time period, and radius (found out in previous part) so we can find out the mass.