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Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding the [energy-conservation] tag if it is specifically about its conservation.

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Calculate/estimate power of a fission bomb

The energy release by the bomb is given by the total mass, ie., tamper plus fission material divided by 2 and multiplied by the velocity of expansion squared. … Mass converted to energy, just under $1$ g. …
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