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Q.

When a satellite is orbitting round a planet in circular orbit, workdone by the gravitational force acting on the satellite is

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a

zero on completing one revolution only

b

zero always

c

infinite

d

negative

answer is B.

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Detailed Solution

Gravitational force large (overrightarrow {F_g}) of attraction of a planet on a satellite moving in circular orbit around the planet is radially inward and the direction of velocity  large (overrightarrow {V}) of the satellite is along the tangent. So rate of work done on the satellite = large overrightarrow {F_g}.overrightarrow V

= Fg V cos 900 = 0

Hence option - (2) is right.

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