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Consider a planet moving in an elliptica...

Consider a planet moving in an elliptical orbit round the sun. The work done on the planet by the gravitational force of the sun

A

is zero in some part of the orbit

B

is zero in no part of the motion

C

is zero in any small part of the orbit

D

is zero in one small part of the orbit

Text Solution

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The correct Answer is:
C, D
Work done `w = vecF. vecds` , for a displacement over any samll part of the orbit `vecF` and `vecds` are perpendicular to each other, hence work done is zero. Also for one complete revolution, displacement is zero, hence work done is zero.
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