NDA 2017 Physics question

Which one of the following statements about a satellite orbiting around the Earth is correct ?

(A)Satellite is kept in orbit by remote control from ground station.
(B)Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the Earth.
(C)Satellite requires energy from solar panels and solid fuels for orbiting.
(D)Satellite does not require any energy for orbiting.Correct

Answer: (D)

Solution

Once a satellite has been given the correct orbital speed, the gravitational pull of the Earth supplies exactly the centripetal force needed for its circular motion. This force is perpendicular to the velocity, so it

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Question ID VK-030902