Answer:
the efficiency of the heat engine is 46%
Explanation:
As we know that the heat extracted from engine is 1300 J
also we know that the heat discharged to the reservoir is 700 J
So we will find efficiency as
[tex]\eta = 1 - \frac{Q_2}{Q_1}[/tex]
[tex]\eta = 1 - \frac{700}{1300}[/tex]
so we have
[tex]\eta = 0.46[/tex]
the efficiency of the heat engine is 46%
