Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 15 - The Laws of Thermodynamics - Misconceptual Questions - Page 437: 2


Choice C.

Work Step by Step

In an isothermal process, the change in internal energy is zero, and Q = W. In an isothermal compression, 100 J of work can be converted into 100 J of heat. In an isothermal expansion, 100 J of heat is converted into 100 J of work. Choice A is tempting because the second law of thermodynamics says it is impossible to make a 100 percent efficient heat engine. However, the question does not say that we must consider a complete cycle.
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