Physics

Physics, 11.11.2019 21:31, ayoismeisjjjjuan

What happens when a spinning ice skater draws in her outstretched arms?

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Physics, 03.07.2019 23:30, kcarstensen59070

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 75.0 kg skater is 1.50 m tall, has arms that are each 66.0 cm long (including the hands), and a trunk that can be modeled as being 33.0 cm in diameter. if the skater is initially spinning at 66.0 rpm with her arms outstretched, what will her angular velocity 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 negligble.

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Physics, 24.07.2019 19:10, KaitlynLucas5132

Nice skater has a moment of inertia of 5.0 kg-m2 when her arms are outstretched. at this time she is spinning at 3.0 revolutions per second (rps). if she pulls in her arms and decreases her moment of inertia to 2.0 kg-m2, how much work will she have to do to pull her arms in?

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Physics, 02.10.2019 08:30, Bengynease2598

An ice skater has a moment of inertia of 5.0 kgm2 when her arms are outstretched. at this time she is spinning at 3.0 revolutions per second (rps). if she pulls in her arms and decreases her moment of inertia to 2.0 kgm2, how fast will she be spinning?

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Physics, 30.10.2019 01:31, giouamado

On average, both arms and hands together account for 13%13% of a person's mass, while the head is 7.0%7.0% and the trunk and legs account for 80%.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 70.0 kg70.0 kg skater is 1.60 m1.60 m tall, has arms that are each 68.0 cm68.0 cm long (including the hands), and a trunk that can be modeled as being 34.0 cm34.0 cm in diameter. if the skater is initially spinning at 71.0 rpm71.0 rpm with her arms outstretched, what will her angular velocity ω2 be (in rpmrpm ) 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 negligble.

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