8-147 A heat engine receives heat from a source at 1500 K at a rate of 600 kJ/s and rejects the waste heat to a sink at 300 K. If the power output of the engine is 400 kW, the second-law efficiency of this heat engine is
a) 42%
b) 53%
c) 83%
d) 67%
e) 80%
 
 
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