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← ScienceWhich constraint limits maximum work when a Carnot engine undergoes a phase change at its hot reservoir?
A)Isothermal heat supply rate✓
B)System's initial total entropy
C)Reservoir thermal expansion alone
D)Cycle's net PV area enclosed
💡 Explanation
Limited isothermal heat supply rate limits the work done in the Carnot cycle, because heat is transferred during the phase transition at constant temperature; therefore power declines due to constraint, rather than a change from initial entropy.
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