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Online Practice: The second law of thermodynamics: reversible and irreversible processes for JEE

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Q1PhysicsUnit 8: Thermodynamics
A reversible engine takes heat from a reservoir at 527∘C527^{\circ} \mathrm{C} and gives out heat to asin⁡ka \sin k at 127∘127^{\circ} C. How many Joules/s must it take from the reservoir to perform useful mechanical work at the rate of 750W?750 W ?

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