# Gravitational force, Speed, and period of a Satellite.

1. Apr 30, 2009

### Imuell1

1. The problem statement, all variables and given/known data
A satellite that has a mass of 300 kg moves in a circular orbit 5.00 X 107 m above Earth's surface. (a) What is the gravitational force on the satellite? (b) What is the speed of the satellite? (c) What is the period of the satellite?

2. Relevant equations
Fg= GMEm/(r+rE
T2= [4pi2/G(ME+m)]*(r+rE)3

3. The attempt at a solution
Fg= 38N
T=37 hours
V=9572517 m/h

I think the gravitational force might be right but the speed and period seem to be ridiculously too large.

2. Apr 30, 2009

### Dweirdo

37 is not so much :D
a broadcasting satellite ,which has period of 24 hours around earth(like the earth around it self!) has a distance of 3.6*10^7 meters from the surface of the earth AFAIK.
But didnt get the same V as You did,did You write T as seconds?(37*60*60
EDIT1:
Oh I did, didn't see Your units ,You better solve it with seconds, and not m/h
EDIT2:
How did the mass of the satellite get to the equation of period?

Last edited: Apr 30, 2009