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Q.

Initial angular velocity of a circular disc of mass M is ω1. Then two small spheres of mass mare attached gently to two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc ?

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a

M+mMω1

b

M+mmω1

c

MM+4mω1

d

MM+2mω1

answer is C.

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Detailed Solution

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From COAM, MR22ω1=MR22+2mR2ω2
⇒ω2=Mω1M+4m

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