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8. A 50 kg ice skater spins about a vertical axis through her body with he making 2.5 turns each second. The distance from one hand to the othe measurements indicate that each hand typically makes up about 1.25 What horizontal force must her wrist exert on her hand? the force in part (a) as a multiple of the weight of her hand.

8. A 50 kg ice skater spins about a vertical axis through her body with he making 2.5 turns each second. The distance from one hand to the othe measurements indicate that each hand typically makes up about 1.25 What horizontal force must her wrist exert on her hand? the force in part (a) as a multiple of the weight of her hand.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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8. A 50 kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. The distance from one hand to the other is 1.50 m. Biometric measurements indicate that each hand typically makes up about 1.25 % of body weight.4 What horizontal force must her wrist exert on her hand? Express the force in part (a) as a multiple of the weight of her hand. 11. A small button placed on a horizontal, rotating platform with diameter 0.320 m will revolve with the platform when it is brought up to a rotational speed of 37.0 rev/min, provided the button is no more than 0.140 m from the axis. What is the coefficient of static friction between the button and the platform? inoianct od.oldut How far from the axis can the button be placed, without slipping, if the platform rotates at 60.0 rev/min? ine lo bno orf 13. A 5.0-m-diameter merry-go-round is turning with a 4.2 s period. What is the speed of a child on the rim? 14. The blade on a table saw spins at 3800 rpm. Its diameter is 25.0 cm. What is the speed of a tooth on the edge of the blade in m/s? What is the speed of a tooth on the edge of the blade in mph? 15. An old-fashioned LP record rotates at 33½ rpm. What is its frequency in rev/s? What is its period, in seconds? 16. A typical hard disk in a computer spins at 10000 rpm. What is the frequency, in rev/s? What is the period, in seconds? diy olonio oshod sni 0og 2sms dW dod a odi ni noiene ar oldat od bluow ROM drive in a computer spins the 12-cm-diameter disks at 7300 rpm.
Transcribed Image Text:8. A 50 kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. The distance from one hand to the other is 1.50 m. Biometric measurements indicate that each hand typically makes up about 1.25 % of body weight.4 What horizontal force must her wrist exert on her hand? Express the force in part (a) as a multiple of the weight of her hand. 11. A small button placed on a horizontal, rotating platform with diameter 0.320 m will revolve with the platform when it is brought up to a rotational speed of 37.0 rev/min, provided the button is no more than 0.140 m from the axis. What is the coefficient of static friction between the button and the platform? inoianct od.oldut How far from the axis can the button be placed, without slipping, if the platform rotates at 60.0 rev/min? ine lo bno orf 13. A 5.0-m-diameter merry-go-round is turning with a 4.2 s period. What is the speed of a child on the rim? 14. The blade on a table saw spins at 3800 rpm. Its diameter is 25.0 cm. What is the speed of a tooth on the edge of the blade in m/s? What is the speed of a tooth on the edge of the blade in mph? 15. An old-fashioned LP record rotates at 33½ rpm. What is its frequency in rev/s? What is its period, in seconds? 16. A typical hard disk in a computer spins at 10000 rpm. What is the frequency, in rev/s? What is the period, in seconds? diy olonio oshod sni 0og 2sms dW dod a odi ni noiene ar oldat od bluow ROM drive in a computer spins the 12-cm-diameter disks at 7300 rpm.
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