A) A
B) B
C) C
D) D
Correct Answer: A
Solution :
Key Idea In planetary motion, angular momentum remains conserved. The earth revolves around the sun once in a year. In order to find the rotational kinetic energy about the sun, we may treat the earth as a point mass, of moment of inertia \[I\]. If \[\omega \]is angular velocity of earth, then \[{{K}_{rot}}=\frac{1}{2}I{{\omega }^{2}}\] In planetary motion, angular momentum remains conserved. At A, the moment of inertia is least, so angular speed is maximum. So, at A, rotational kinetic energy is maximum.
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