A Man Stands on the Center of a Platform That

question 2

Multiple Choice

A man stands on the center of a platform that is rotating on frictionless bearings at a speed of 1.00 rad/s.Originally his arms are outstretched and he holds a 4.54-kg mass in each hand.He then pulls the weights in toward his body.Assume the moment of inertia of the man,including his arms,to remain constant at 5.42 kg · m².If the original distance of the weights from the axis is 0.914 m and their final distance is 0.305 m,the final angular velocity is

• A)1.14 rad/s
• B)1.27 rad/s
• C)1.58 rad/s
• D)2.08 rad/s
• E)7.70 rad/s

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