Q151 / 180 · KCET 2023 · Physics

When a planet revolves around the Sun, in general, for the planet

A
linear momentum and linear velocity are constant.
B
linear momentum and areal velocity are constant.
C
kinetic and potential energy of the planet are constant.
Correct answer
D
angular momentum about the Sun and areal velocity of the planet are constant.

Solution

When a planet revolves around the sun, net external torque is zero. Therefore its angular momentum is conserved. As a consequence, its areal velotity remains the same/constant.

Hence, the correct answer is option: 'D'.

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