OCR Physics A G485 FPFoP Unofficial mark scheme

Is there any chance you can upload the questions?

Reply 21

Aph

22

@teachercol for 11i) you seem to be using the diameter of andromeda as opposed to the radius in your tan?

Reply 22

Biggie34

For 2a) I said the field shouldn't be uniform due to the varying distance, is that right

Reply 23

Is 80 out of 100 a / a**??

So many stupid mistakes -.-*

(edited 7 years ago)

Reply 24

I got 0.211 kg for the mass would I get like 2 marks for method and the graph I draw a cos graph for an end would I get 1 mark?*
I also got 0.62 for the angle. *

Reply 25

only 4 marks out of 100 for medical 😳

Reply 26

He doesn't upload paper because I think it's not allowed.
*

Original post by Ramil Ahmadov

Is there any chance you can upload the questions?

Reply 27

nadz_98

4

Thank you so much. This really helps, appreciate your support and time to post this.

Reply 28

Leechayy

13

The papers are beautiful this year in comparison to 2015 especially G485.
Based off what everyone's saying, 77 seems like low/mid-A in terms of boundaries :o:

o
Correct me if I'm wrong :p:

p

Reply 29

lai812matthew

10

this is harder than last year's paper......

Reply 30

Hi TeacherCol, thanks for the mark scheme!For the last question on finding the number of stars in the galaxy, I am highly confident that I got that exact same right answer of 3.0E10, but I used Keplers Third Law equation to work this answer out, would that be acceptable? Does this work either way (Keplers third law or Grav/Centripetal force formulas)?

Reply 31

So I guess I got anywhere between 76-84 out of 100. Hopefully a good A grade :redface:

Reply 32

teachercol

OP

9

Original post by Ramil Ahmadov

Is there any chance you can upload the questions?

No - its not allowed

Reply 33

Leechayy

13

Original post by speed1✈️✈️

Hi TeacherCol, thanks for the mark scheme!For the last question on finding the number of stars in the galaxy, I am highly confident that I got that exact same right answer of 3.0E10, but I used Keplers Third Law equation to work this answer out, would that be acceptable? Does this work either way (Keplers third law or Grav/Centripetal force formulas)?

That's what I did and I got the same so it should be fine (:

Reply 34

teachercol

OP

9

Original post by Aph

@teachercol for 11i) you seem to be using the diameter of andromeda as opposed to the radius in your tan?

I think you should use the diameter to find the angle subtended.

Reply 35

Original post by Leechayy

That's what I did and I got the same so it should be fine (:

Excellent! I was so worried because I asked one of my (clever) classmates and he laughed and completely rediculed my method of using Keplers 3rd Law. So I was convinced I lost all 4 marks, aka 8ums, perhaps even my A in Physics and my firm choice uni hahah.

Reply 36

Leechayy

13

Original post by speed1✈️✈️

Excellent! I was so worried because I asked one of my (clever) classmates and he laughed and completely rediculed my method of using Keplers 3rd Law. So I was convinced I lost all 4 marks, aka 8ums, perhaps even my A in Physics and my firm choice uni hahah.

"Clever"

Why was you ridiculed for using that method? :mmm:

Fc = Fgrav is essentially the first step of deriving Kepler's 3rd Law so that's just funny he said that :tongue:

Reply 37