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zzinfinity
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Homework Statement
How far above the surface of the Earth do you need to be for the force of gravity to be reduced to 70% of its value on the surface.
Homework Equations
g on surface is 9.8 m/s^2
Fg=G*m1*m2/r^2
The Attempt at a Solution
Is there a way to do this without knowing the mass of the earth? It seems as though the gravity equation I have above could only be useful if you knew either the mass of the Earth or the radius of the earth. I was just wondering if there is a way to approach this without knowing either of those. Thanks!