Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 18 - Think and Explain: 49

Answer

The first law of thermodynamics is a statement of the law of conservation of energy, as it applies to work and heat. 100 J of work is done on the system, and 80 J escapes as heat, so the internal energy will rise. The change is 100 J – 80 J = 20 J.
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