일반물리학 1 — Entropy and the Second Law of Thermodynamics: Problem 17

17 A 50.0 g block of copper whose temperature is 200 K is placed in an insulating box with a 100 g block of lead whose temperature is 400 K. (a) What is the equilibrium temperature of the two-block system? (b) What is the change in the internal energy of the system between the initial state and the equilibrium state? (c) What is the change in the entropy of the system? (See Table 18-3.)