Posted by **kelsey** on Thursday, October 30, 2008 at 11:58pm.

A typical GPS (Global Positioning System) satellite orbits at an altitude of 4.0 107 m. (Astronomical data needed for this problem can be found on the inside back cover of the text.)

(a) Find the orbital period of such a satellite.

hours

(b) Find the orbital speed of such a satellite.

km/s

i cannot find the equation to use for this...please help?

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