# Issac Physcis

Announcements
#1
The planet Mogg is completely spherical, with radius 2.3×106m Calculate the gravitational field strength at a height of 100km above the surface of the planet. Use the information given in question F5.6 and give your answer to 2 significant figures.

(F5.6 --At a distance of 1.0×107m from the centre of planet Mogg, the gravitational field strength due to Mogg is 2.1Nkg−1. Calculate the gravitational field strength at a distance of 5.0×107m)
0
3 years ago
#2
Solve to find the mass then just plug it into the formula
0
3 years ago
#3
You can also use proportionality

g=GM/r^2
since M is constant and G is constant,
g is inversely proportional to r^2
so g1r12=g2r22
here g1 = 2.1Nkg−1 and r1=1.0×107m
g2 = ?, r2= 100 x103 + 2.3×106
0
#4
Thank You
0
#5
(Original post by BobbJo)
You can also use proportionality

g=GM/r^2
since M is constant and G is constant,
g is inversely proportional to r^2
so g1r12=g2r22
here g1 = 2.1Nkg−1 and r1=1.0×107m
g2 = ?, r2= 100 x103 + 2.3×106

Thank You
0
#6
How would you use the information in questions F5.6 and F5.7, calculate the gravitational field strength due to planet Mogg at a distance of 3.0x10^6 m from the centre?

F5.7 (The planet Mogg is completely spherical, with radius 2.3×106m Calculate the gravitational field strength at a height of 100km above the surface of the planet. Use the information given in question F5.6 and give your answer to 2 significant figures.

(F5.6 --At a distance of 1.0×107m from the centre of planet Mogg, the gravitational field strength due to Mogg is 2.1Nkg−1. Calculate the gravitational field strength at a distance of 5.0×107m)
0
#7
(Original post by BobbJo)
You can also use proportionality

g=GM/r^2
since M is constant and G is constant,
g is inversely proportional to r^2
so g1r12=g2r22
here g1 = 2.1Nkg−1 and r1=1.0×107m
g2 = ?, r2= 100 x103 + 2.3×106
Thank you
0
X

new posts Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Year 12s - where are you at with making decisions about university?

I’ve chosen my course and my university (14)
28%
I’ve chosen my course and shortlisted some universities (21)
42%
I’ve chosen my course, but not any universities (2)
4%
I’ve chosen my university, but not my course (2)
4%
I’ve shortlisted some universities, but not my course (4)
8%
I’m starting to consider my university options (6)
12%
I haven’t started thinking about university yet (0)
0%
I’m not planning on going to university (1)
2%