In a Playground There Is a Small Merry-Go-Round of Radius

question 44

Multiple Choice

In a playground there is a small merry-go-round of radius 1.25 m and mass 175 kg.Assume the merry-go-round to be a uniform disc.A child of mass 45 kg runs at a speed of 3.0 m/s tangent to the rim of the merry-go-round (initially at rest) and jumps on.If we neglect friction,what is the angular speed of the merry-go-round after the child has jumped on and is standing at its outer rim?

• A)0.82 rad/s
• B)2.4 rad/s
• C)0.49 rad/s
• D)1.2 rad/s
• E)0.41 rad/s

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Definitions:

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