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4) Two substances are in thermal equilibrium at the temperature To. They have masses m, m and specific heats c, c. The substances are

4) Two substances are in thermal equilibrium at the temperature To. They have masses m, m and specific heats c, c. The substances are then put separately in thermal contact with a colder heat reservoir at the temperature Thr. The whole system is thermally isolated from the surrounding medium. Calculate the total change in entropy (no phase change occur).

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