Two reversible Carnot engines operate in series between a high‑temperature (TH) and a low temperature (Tc) reservoir. Engine A rejects heat to engine B, which in turn rejects heat to the low‑temperature reservoir. The high‑temperature reservoir supplies heat to engine A. Let TH= 10000K and Tc = 4000K and the engine thermal efficiencies are equal. The heat received by engine A is 500 kJ. Determine (a) the temperature of heat rejection by engine A; (b) the works of engine A and engine B; (c) the heat rejected by engine B

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.