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

Practice Questions

Q1
If a planet rotates about its axis, which of the following statements is true regarding its angular momentum?
  1. It is zero
  2. It is constant
  3. It changes with time
  4. It depends on the distance from the sun

Questions & Step-by-Step Solutions

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.
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