In a steam engine, steam at 140°C in a turbine does work on an external system, and the steam leaves the turbine at 100°C. The efficiency of the steam engine is 5%. The relevant physical principle is

a. the first law of thermodynamics
b. the second law of thermodynamics
c. specific heat capacity
d. operation of a heat pump
e. none of the above


B

Physics & Space Science

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