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Finding ortibal period and orbital speed PLEASE HELP

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!
 

mgb_phys

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