Conceptual Physics (12th Edition)

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

Chapter 18 - Think and Explain: 70

Answer

Their temperature will be lower than their initial temperature in the combustion chamber.

Work Step by Step

The gas expands, and its temperature drops. Also, by the law of conservation of energy, some of the gas's internal energy is transformed into the rocket's kinetic energy, also showing that the temperature of the expelled gas is lower.
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