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Jtappan
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Homework Statement
a) Find the altitude above the Earth's surface where Earth's gravitational field strength would be two-thirds of its value at the surface. Assume re = 6.371 103 km.
__________ km
(b) Find the altitude above the Earth's surface where Earth's gravitational field strength would be one-third of its value at the surface.
___________km
[Hint: First find the radius for each situation; then recall that the altitude is the distance from the surface to a point above the surface. Use proportional reasoning.]
Homework Equations
This is what I am having trouble with. What equation do I use?
The Attempt at a Solution
I am having trouble with the equation. Which equation do I use for gravitational strength that involves height...or distance from the surface of the earth??