MHT CET · Physics · Gravitation
A planet is moving around the sun in an elliptical orbit at different positions A, B, C, D. The maximum rotational kinetic energy of a planet is at postion.
- A D
- B B
- C A
- D C
Answer & Solution
Correct Answer
(D) C
Step-by-step Solution
Detailed explanation
Concept: Angular momentum is always conserved as the torque (or forces) between sun and the planet is internal.
\(L=m v r\)
When a planet is closest to the sun ( \(r\) is minimum), it attains its highest orbital velocity ( \(v\) is maximum), thus attaining maximum Kinetic Energy. So, the K.E of the planet will be maximum at point C.
\(L=m v r\)
When a planet is closest to the sun ( \(r\) is minimum), it attains its highest orbital velocity ( \(v\) is maximum), thus attaining maximum Kinetic Energy. So, the K.E of the planet will be maximum at point C.
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