Physics

Problem

When

5.0\,\text{MJ}

of energy is supplied as heat to an isolated metal block, which statement best describes what happens to the block’s total rest mass? a) It decreases by a small amount equal to

E/c^{2}

, because energy replaces mass. b) It remains unchanged; the block’s rest mass is invariant and only its relativistic mass could change. c) It increases by a very small amount

\Delta m = E/c^{2}

. (Correct) d) It increases by a small amount

\Delta m = E/c

owing to the added energy.

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