Question

It is found that an engine discharges 100.0 J while absorbing 125.0 J each cycle of operation.

(a) What is the efficiency of the engine?
a) 0.20
b) 0.44
c) 0.80
d) 1.25

Answer 1

The efficiency of the engine is 80%.

Step-by-step explanation:

The efficiency of an engine is calculated by dividing the useful work output by the total energy input. In this case, the engine discharges 100.0 J of work while absorbing 125.0 J of energy each cycle. The efficiency can be calculated by dividing the work output by the energy input and multiplying by 100%:

Efficiency = (Work Output / Energy Input) * 100%

Efficiency = (100.0 J / 125.0 J) * 100% = 80%

Therefore, the efficiency of the engine is 80% (option c).