Question:
A person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation
A person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation
Updated On: May 12, 2024
- increases
- decreases
- remains unchanged
- doubles
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The Correct Option is C
Solution and Explanation
A person sitting firmly over a rotating stool has his arms stretched and as he folds his arms, centre of mass remain unchanged and therefore, angular momentum about the axis of rotation remain unchanged.
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Concepts Used:
System of Particles and Rotational Motion
- The system of particles refers to the extended body which is considered a rigid body most of the time for simple or easy understanding. A rigid body is a body with a perfectly definite and unchangeable shape.
- The distance between the pair of particles in such a body does not replace or alter. Rotational motion can be described as the motion of a rigid body originates in such a manner that all of its particles move in a circle about an axis with a common angular velocity.
- The few common examples of rotational motion are the motion of the blade of a windmill and periodic motion.