# Orbital speed of a satellite.

## Homework Statement

A satellite is in circular orbit above the Earth at an altitude of 7000 km. What is the orbital speed of the satellite?

## Homework Equations

Well, knowing that the mass of earth of 5.98 X 10^24 kg

And the radius of earth is 6.38 x 10^6 m

What equation do I start with here? The "speed" portion is whats getting me.