Question

What is the efficiency of an engine that exhausts 440 J of heat to a cold reservoir and receives 570 J of heat from a hot reservoir? *

Answer 1

Efficiency = 77%

Step-by-step explanation:

Input energy = 570 J

Output energy = 440 J

To find the efficiency;

`Efficiency = \frac {Out-put \; energy}{In-put \; energy} * 100`

Substituting into the equation, we have;

`Efficiency = \frac {440}{570} * 100`

`Efficiency = 0.7719 * 100`

Efficiency = 77.19 ≈ 77%

Therefore, the efficiency of the engine is 77 percent.