College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question
A circular disk of mass 0.5 kg and radius 21 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.5 rad/s. a) Find the new angular velocity of the combination; 2.7 rad/s b) The change in the kinetic energy? 0 J c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the original speed in 3 s? 0.013 N*m
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Transcribed Image Text:A circular disk of mass 0.5 kg and radius 21 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.5 rad/s. a) Find the new angular velocity of the combination; 2.7 rad/s b) The change in the kinetic energy? 0 J c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the original speed in 3 s? 0.013 N*m
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Step 1: Determine the given variables
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Step 2: Part(a) Calculate the new angular velocity of combination
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Step 3: Part(b) Calculate The change In the kinetic energy
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Step 4: Part (c) Calculate constant torque needed to regain the original speed in 3s
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