Q.

The earth moves around the sun in a nearly circular orbit. How much work is done by the gravitational force of the sun on the earth?


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a

0

b

1

c

2

d

None of these 

answer is A.

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Detailed Solution

The earth moves around the sun in a nearly circular orbit. The work done by the gravitational force of the sun on the earth is zero.
When the earth moves around the sun, the amount of work done by the gravitational force of the sun on the earth is zero. Because the centripetal force which acts on the earth is perpendicular to the direction of the circular motion of the earth. The formula for work done is given below,
Word done = Force × Displacement  
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