Let (S) be a satellite between the earth and the moon such that (S) is at a distance dm from the moon. All forces on the the satellite are null (equal zero). Find the distance dm .
Given: Distance between moon and earth is 38*10^4km and the mass of earth is 81 times the mass of the moon.
The Attempt at a Solution
Well it's been a long time since I've done any universal gravitation. It would be nice if someone can just give me an idea on how to start and I'll go from there.