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Q.

A man turns on rotating table with an angular speed ω. He is holding two equal masses at arms length. Without moving his arms, he just drops the two masses. How will his angular speed change?

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a

less than ω

b

more than ω

c

it will be equal to ω

d

it will be more thanω if the dropped mass is  more than 9.8kg and it will be less thanω if the mass dropped is less than 9.8kg

answer is C.

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Detailed Solution

As it is simply dropped the distance of the masses from the axis remain same so moment of inertia remains constant hence angular velocity.
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A man turns on rotating table with an angular speed ω. He is holding two equal masses at arms length. Without moving his arms, he just drops the two masses. How will his angular speed change?