If a planet rotates about its axis, which of the following statements is true re

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Question: If a planet rotates about its axis, which of the following statements is true regarding its angular momentum?

Options:

Correct Answer: It is constant

Solution:

The angular momentum of a rotating planet is constant if no external torques act on it.

If a planet rotates about its axis, which of the following statements is true regarding its angular momentum?

If a planet rotates about its axis, which of the following statements is true regarding its angular momentum?

Step 1: Understand what angular momentum is. It is a measure of how much motion an object has while it is rotating.
Step 2: Know that a planet rotates around its axis, which means it spins like a top.
Step 3: Learn about external torques. A torque is a force that causes an object to rotate. An external torque comes from outside the planet.
Step 4: Remember the rule: If no external torques are acting on the planet, its angular momentum will not change.
Step 5: Conclude that the angular momentum of a rotating planet remains constant as long as there are no outside forces trying to change it.

Angular Momentum – Angular momentum is a measure of the rotational motion of an object and is conserved in a closed system without external torques.
Conservation of Angular Momentum – The principle that if no external torque acts on a system, the total angular momentum remains constant.