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A man standing on a rotating horizontal ...

A man standing on a rotating horizontal circular table, suddenly sits down. What is conserved in this process ?

A

kinetic energy

B

angular speed

C

angular momentum

D

linear momentum

Text Solution

Verified by Experts

The correct Answer is:
C
The angular momentum of a system of particles is not conserved, if a net external torque acts upon the system.
L is conserved if `tau=0`
`tau=(dL)/(dt)" if " tau=0, (dL)/(dt)=0`
`therefore" "L=Iomega="constant or is conserved"`
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