A Merry-Go-Round of Radius R = 2

question 39

Multiple Choice

A merry-go-round of radius R = 2.0 m has a moment of inertia I = 250 kg⋅m², and is rotating at 10 rpm. A child whose mass is 25 kg jumps onto the edge of the merry-go-round, heading directly toward the center at 6.0 m/s. The new angular speed (in rpm) of the merry-go-round is approximately

• A) 10
• B) 9.2
• C) 8.5
• D) 7.1
• E) 6.4

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