A chunk of radioactive material encased in an idealized, perfectly insulating blanket gets warmer as its nuclei

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A chunk of radioactive material encased in an idealized, perfectly insulating blanket gets warmer as its nuclei decay and release energy. Does the mass of the radioactive material and the blanket change? If so, does it increase or decrease?
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Conceptual Physics

ISBN: 978-0321568090

11th edition

Authors: Paul G. Hewitt

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