JEE Main Physics question
Assertion: A force acts upon the earth revolving in a circular orbit about the sun; hence work should be done on the earth. Reason: The necessary centripetal force for the circular motion of the earth comes from the gravitational force between the earth and the sun.
Answer: (D)
Solution
The earth moves in (nearly) a circular path, and the gravitational force supplying the centripetal force is always perpendicular to the earth's velocity, so it does
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