Conceptual Physics (12th Edition)

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

Chapter 18 - Think and Explain: 69

Answer

Inside the drinking bird, heat enters the lower body (the hot reservoir) and leaves via the cold beak (the cold reservoir). Mechanical energy (the rocking motion) is produced. A heat engine is precisely a device that uses heat as input and produces mechanical work.
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