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Gravitational Force question

  • Thread starter chiurox
  • Start date
35
0
1. Homework Statement
What is the force of gravity acting on a 4500kg satellite when it orbits three Earth radii from the Earth's center?

2. Homework Equations
Gm1m2/r²
mass of the earth=5.98*10^24kg
radius of the earth=6370km

3. The Attempt at a Solution
This is a multiple choice question, with answers:
15000N
45000N
500N
1500N
5000N

However, what I get from plugging in is:
[(6.67*10^-11)(4500)(5.98*10^24)]/(3*6370)²
which equals roughly: 5.0*10^9 which is completely off any of the answers... can anyone help me?

hahaha, never mind! I forgot to convert the km to m... -_-
 
Last edited:

Answers and Replies

458
0
You're not using SI units for distance.
 

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