A small blob of putty of mass m falls from the ceiling and lands on the outer ri

Question

A small blob of putty of mass m falls from the ceiling and lands on the outer rim of a turntable of radius R and moment of inertia I0 that is rotating freely with angular speed ?0 about its vertical fixed-symmetry axis. (Use any variable or symbol stated above as necessary.) (a) What is the postcollision angular speed of the turntable-putty system? ?f = (b) After several turns, the blob flies off the edge of the turntable. What is the angular speed of the turntable after the blob's departure? ? =

Explanation / Answer

Angular momentum is conserved in both cases.

(a)
(Io)(?o) = (Io + mR

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