Problem: A playground merry-go-round has a radius of 3 m and a rotational inertia of 600 kg · m2 . It is initially spinning at 0.8 rad/s when a 20 kg child starts crawling from the center toward the rim. When the child reaches the rim, what is the new angular speed of the merry-go-round? Ignore the friction force on the axle of the merry-go-round. A. 1.1 rad/s B. 0.73 rad/s C. 0.8 rad/s D. 0.62 rad/s  E. 0.89 rad/s

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Problem Details

A playground merry-go-round has a radius of 3 m and a rotational inertia of 600 kg · m2 . It is initially spinning at 0.8 rad/s when a 20 kg child starts crawling from the center toward the rim. When the child reaches the rim, what is the new angular speed of the merry-go-round? Ignore the friction force on the axle of the merry-go-round.

A. 1.1 rad/s

B. 0.73 rad/s

C. 0.8 rad/s

D. 0.62 rad/s 

E. 0.89 rad/s

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Based on our data, we think this problem is relevant for Professor Stephens' class at TEXAS.