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## Homework Statement

Communications satellites are placed in orbits such that they rotate the Earth once every 24.0 hours. Determine how high above the Earths surface these satellites must be placed.

## Homework Equations

GM/4(3.14 squared) times T squared

## The Attempt at a Solution

so i know that first i have to get the radius by using GM/4(3.14 squared) times T squared, and then subract the earths radius from that, but what would be the M in that equation?