Answer:
E = 0.251 or 25.1%
The efficiency of the engine is 0.251 or 25.1%
Explanation:
Maximum Efficiency of an engine can be expressed as;
Em = workdone/heat energy supplied
Em = 1 - Qc/Qh = 1 - Tc/Th
Given;
Tc = cold temperature = 570K
Th = hot temperature = 980K
Substituting the values;
Em = 1 - 570/980
Em = 0.4184
But the engine operates at three-fifths the maximum efficiency
E = 3/5 × Em
Substituting Em
E = 3/5 × 0.4184
E = 0.251 or 25.1%
The efficiency of the engine is 0.251 or 25.1%
