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8. What is a period of revolution of earth satellite ? Ignore the height of satellite above the surface of earth. 

Given ; (1) The value of gravitational acceleration g=10 ms-2
           (2) Radius of earth RE =6400 km. Take  π =3.14
(1) 85 minutes               (2) 156 minutes
(3) 83.73 minutes          (4) 90 minutes. 

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