A rotating system has an initial angular momentum L. If no external torque acts on it, what will be the angular momentum after some time?

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Q: A rotating system has an initial angular momentum L. If no external torque acts on it, what will be the angular momentum after some time?

Solution: Angular momentum is conserved in the absence of external torque.

Steps: 5

Step 1: Understand what angular momentum is. It is a measure of how much motion an object has while rotating.
Step 2: Recognize that the system starts with an initial angular momentum, which we call L.
Step 3: Identify that 'no external torque' means there are no outside forces trying to change the rotation.
Step 4: Remember the principle of conservation of angular momentum, which states that if no external torque acts on a system, its angular momentum remains constant.
Step 5: Conclude that after some time, the angular momentum will still be L, the same as the initial value.