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A satellite of mass m is moving in a cir...

A satellite of mass m is moving in a circular or orbit of radius R around the earth. The radius of the earth is r and the acceleration due to gravity at the surface of the earth is g. Obtain expressions for the following `:`
(a) The acceleration due to gravity at a distance R from the centre of the earth
(b) The linear speed of the satellite
(c ) The time period of the satellite

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