Question

A heat engine performs work 0.4166 watt in one hour and rejects 4500 joules of heat energythe sink. What is the efficiency of the engine?​

Answer 1

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Answer 2

Answer:

Efficency of engine is $20$%.

Explanation:

Given in question:

W=$100$ J , $Q2$ = $400$ J ,  η= ?

W = $Q2-Q1$

$100$ = $Q1-$$400$

$Q1=100+400$

      $=500$ J

η=$\frac{Q1-Q2}{Q1}$

 = $\frac{500 J-400 J}{500 J}$

 η= $0.2$

Therefore percentage of efficency is = $0.2$×$100$

                                                              = $20$%