A \(20 \mathrm{~kg}\) block of steel at \(23^{\circ} \mathrm{C}\) and a \(150 \mathrm{~g}\) piece of brass at \(520^{\circ} \mathrm{C}\) are placed in contact inside an insulated container and allowed to come to thermal equilibrium. Which metal, if either, has the greater change of thermal energy? Explain.