Q: A satellite is revolving round the earth in an elliptical orbit.
(a) Gravitational force exerted by earth is equal to centripetal force at some points
(b) Work done by gravitational force is zero in some small parts of the orbit
(c) Power associated with gravitational force is zero at every at every point
(d) At some point the magnitude of gravitational force is greater than that of centripetal force.
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