You are Here: Home >< Physics

# aqa physics multiple choice question q9

Announcements Posted on
Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter 24-10-2016
1. http://filestore.aqa.org.uk/subjects...1-QP-JUN15.PDF

can somone help with q9 ?
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

You can also find the Exam Thread list for A-levels here and GCSE here.

Just quoting in Puddles the Monkey so she can move the thread if needed
Spoiler:
Show
(Original post by Puddles the Monkey)
x
3. The volume of the spherical planet is 4/3 * pi * r^3 where r = R in this case. Therefore the volume is 4/3 * pi * R^3. Since the planet has a uniform density of P, and mass = density * volume, the mass of the planet is 4/3 * pi * R^3 * P. The distance between the centre of masses of the satellite and the planet is 2R because the radius of the planet is R and the satellite is R metres above the planet. Using the 'force between two masses' formula where m1 = 4/3 * pi * R^3 * P, m2 = m and r = 2R, you get (G * 4/3*pi*R*p * m) / (2R)^2. Cancel all that down and you get G*pi*R*p*m / 3. This is answer A
4. You had to cross it out

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 9, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources