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## Homework Statement

Communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as the earth rotates. The radius of the earth is 6.37 x 10

^{6}m, and the altitude of a geosynchronous orbit is 3.58 x 10

^{7}m. What are (a) the speed and (b) the magnitude of the acceleration of a satellite in a geosynchronous orbit?

## Homework Equations

M (mass of the earth) = 5.98 x 10

^{24}

G (gravitational constant) = 6.67 x10

^{-11}

__GMm__=

__mv__

^{2}r

^{2}........ r

## The Attempt at a Solution

I understand the problem and how to get the answer. I just do not understand where the units go on the above formula and where it is derived from.