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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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Time-Energy Uncertainty Relation when $A$ depends explicitly on $t$

There are several questions asking by the meaning of Time-Energy uncertainly relation and also by its derivation. My problem is about the second. …
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