Question

Two solid bodies of equal mass and identical composition, isolated from the surroundings and each other and kept initially at temperature T1 and T2 are brought into thermal contact until they attain thermal equilibrium with each other. Compute the amount of entropy change of the universe in terms of T1, T2, and the heat capacity C_p of each body , assuming the process to take place at constant pressure exerted on them by the environment and show that the entropy indeed increases during the process

Answer 1