A heat engine performs (245 + A) J of work in each cycle while also delivering (142 + B) J of heat to the cold reservoir. Find the efficiency of the heat engine. Give your answer in percent (%) and with 3 significant figures.
A=10
B=10
A = 10
B = 10
Work done by the heat engine in each cycle = W = (245 + A) J = (245 + 10) J = 255 J
Heat delivered to the cold reservoir by the heat engine in each cycle = Qc = (142 + B) J = (142 + 10) J = 152 J
Heat extracted from the hot reservoir by the heat engine in each cycle = Qh
Qh = W + Qc
Qh = 255 + 152
Qh = 407 J
Efficiency of the heat engine =
= 0.627
= 62.7%
Efficiency of the heat engine = 62.7%
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