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43.2 $E = mc^2$
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The conversion of mass into energy is often associated with nuclear forces. Is that essential?
When you turn on a flashlight and it emits light, does its mass go down?
If you heat up a sandwich, without jostling any atoms free, does its mass increase?
E = mc^2. So, what is the factor of γ doing in E=m0c2γ?