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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Physics, 22.06.2019 15:50
If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?
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Physics, 22.06.2019 16:50
Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?
Answers: 2
On average, both arms and hands together account for 13%13% of a person's mass, while the head is 7....
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