1. An object tied at one end of a 20 cm string is whirled around in a horizontal circular path. If it completely rotates 3 times in one minute what is its tangential speed? 2. An electric motor operates at 1800 rpm. Find its angular speed in radians/second. What is the linear speed of a point 55 mm from the axis of rotation? What is its centripetal acceleration? 3. A 0.83 kg ball is whirled horizontally at the end of a string 1.01 m long with a speed of 3.88 m/s. What force must be exerted on the string to keep the ball from flying off?

1. An object tied at one end of a 20 cm string is whirled around in a horizontal circular path. If it completely rotates 3 times in one minute what is its tangential speed? 2. An electric motor operates at 1800 rpm. Find its angular speed in radians/second. What is the linear speed of a point 55 mm from the axis of rotation? What is its centripetal acceleration? 3. A 0.83 kg ball is whirled horizontally at the end of a string 1.01 m long with a speed of 3.88 m/s. What force must be exerted on the string to keep the ball from flying off?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section: Chapter Questions

Problem 103A

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