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What is the period of revolution of a satellite of mass m that orbits the earth in a circular path of radius 7880km about 1500km above the surface of the earth?

Given,

Radius of the orbit (r)=7880km=7880103m
Height (h)=1500km=1500103m
Period of revolution (T)=?
Radius of earth (R)=rh=(78801500)6380103m
We have,

T=2π(R+h)3(gR)2
or, T=2π(6380000+1500000)39.8(6380000)2=6955.29Sec=1.91hrs
∴ The time period of the revolution = 1.91hrs.
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