A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)
To calculate the efficiency of a heat engine, you can use the formula:
Efficiency = (Useful output energy / Input energy) * 100
In this case, the useful output energy is the amount of heat absorbed, which is 126 kcal, and the input energy is the amount of heat exhausted, which is 77 kcal.
Plugging these values into the formula, we get:
Efficiency = (126 kcal / 77 kcal) * 100
Now, let's solve the equation:
Efficiency = (1.6364...) * 100
Efficiency ≈ 163.64%
Therefore, the efficiency of this heat engine is approximately 163.64%.