In Exercises use the result of to find the speed necessary for the given circular orbit around Earth. Let GM = 9.56 × 10⁴ cubic miles per second per second, and assume the radius of Earth is 4000 miles.

The orbit of a communications satellite r miles above the surface of Earth that is in geosynchronous orbit. [The satellite completes one orbit per sidereal day (approximately 23 hours, 56 minutes), and therefore appears to remain stationary above a point on Earth.]