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A 40.5 g block of copper whose temperature is 494 K is placed in an insulating...

A 40.5 g block of copper whose temperature is 494 K is placed in an insulating box with a 76.9 g block of lead whose temperature is 228 K. (a) What is the equilibrium temperature of the two-block system? (b) What is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) What is the change in the entropy of the two-block system? The heat capacities of copper and lead are 386 J/kg·K and 128 J/kg·K, respectively.

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