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**1. Homework Statement**

GPS (Global Positioning System) satellites orbit at an altitude of 2.6×107 .

Find the orbital period.

Find the orbital speed of such a satellite.

**2. Homework Equations**

I would like to know how to approach this. I don't know where to start w/o other figures.

**3. The Attempt at a Solution**

I went through a long, convoluted process and determined 2.8*10^29, which is entirely wrong. Please help!!

Thank you in advance!