Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 17, Problem 1RQ
Should a metal bar be heated or cooled to make it expand?
Expert Solution & Answer
To determine
Whether the heating of a metal bar results in expansion of it, or cooling results in expansion of it.
Explanation of Solution
In general, all the metals expand on heating and contract on cooling but the rate of expansion and contraction differs for every metals. The rate of expansion depends on the following two factors:
- 1. The type of metal used.
- 2. The magnitude of temperature.
Thus, the expansion of metal bar results due to heating and not cooling.
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Problem 2 (40 Points)
A particle of mass m is embedded at a distance a from the center of a massless circular disk of
radius r. The disk rolls without slipping down a plane inclined at an angle a with the horizontal.
A horizontal force of Ễ = −Fxî + Fyĵ resists motion of the disk down the plane by pushing on
the disk at the axle that runs through the center of the disk.
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Chapter 17 Solutions
Understanding Motor Controls
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Ch. 17 - What type of wire is used to make an RTD?Ch. 17 - What material is a thermistor made of?
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