Universal Gravitation and magnitude

[Dgolverk]

Homework Statement

Determine the magnitude of the force of gravity acting on a 340 kg satellite, 850km above Earth's surface.

Homework Equations

So I dedcided to use the Universal Gravitation Law:
Fg = (Gm1m2)/d^2

The Attempt at a Solution

m1=5.98E24 (earth's mass)
m2=340kg (satellite)
G=6.67E-11
d=850,000m

After subbing them all into the formula I got 187,701N.
However the answer in the book is 2.1E2N.
So I'm not sure if I did it right... can you please check it?
Thanks

 

[Doc Al]

Homework Equations

So I dedcided to use the Universal Gravitation Law:
Fg = (Gm1m2)/d^2

Good choice. But the distance "d" is between the centers of the two bodies, not height above the Earth's surface.

 

[Dgolverk]

Oh.. I see.
So how can I continue? I'm not really sure what to do next...

 

[Doc Al]

You're given the distance between the satellite and the Earth's surface. What's the distance from the Earth's surface to the Earth's center--the radius of the Earth? (Look it up!)

 

[Dgolverk]

Alright I understand.
Thanks :)