Conceptual Physics (12th Edition)

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

Chapter 7 - Think and Discuss: 107

Answer

Your friend may not realize that the energy output by the reactor is indeed put into it, in the form of radioactive fuel. The fuel's mass, over time, decreases as it transforms into energy, as governed by Einstein’s famous equation, $E = mc^{2}$.
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