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On average, both arms and hands together account for 13 % of a person's mass, while...

On average, both arms and hands together account for 13 % of a person's mass, while the head is 7.0 % and the trunk and legs account for 80 % . We can model a spinning skater with her arms outstretched as a vertical cylinder (head, trunk, and legs) with two solid uniform rods (arms and hands) extended horizontally. Suppose a 73.0 kg skater is 1.60 m tall, has arms that are each 68.0 cm long (including the hands), and a trunk that can be modeled as being 34.0 cm in diameter. If the skater is initially spinning at 81.0 rpm with her arms outstretched, what will her angular velocity ω 2 be (in rpm ) after she pulls in her arms and they are at her sides parallel to her trunk? Assume that friction between the skater and the ice is negligible.

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Hence, the requried angular velocity is, 161.53 rpm

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