A 50-M Radius Playground Merry-Go-Round with a Moment of Inertia of of 2000

question 11

Multiple Choice

A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg • m² is rotating freely with an angular speed of 1.0 rad/s.Two people,each having a mass of 60 kg,are standing right outside the edge of the merry-go-round and step on it with negligible speed.What is the angular speed of the merry-go-round right after the two people have stepped on?

• A) 0.20 rad/s
• B) 0.40 rad/s
• C) 0.60 rad/s
• D) 0.80 rad/s
• E) 0.67 rad/s

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Definitions:

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