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

question 104

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 disk. 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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