GravitationHard
Question
A planet is revolving around the sun is an elliptical orbit as shown in figure. Select correct alternative(s)
Options
A.Its total energy is negative at D.
B.Its angular momentum is constant
C.Net torque on planet about sun is zero
D.Linear momentum of the planet is conserved
Solution
For (A) : For bounded system, the total energy is always negative.
For (B) : For central force field, angular momentum is always conserved
For (C) : For central force field, torque = 0
For (D) : In presence of external force, linear momentum is not conserved.
For (B) : For central force field, angular momentum is always conserved
For (C) : For central force field, torque = 0
For (D) : In presence of external force, linear momentum is not conserved.
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