The heat engine per cycle receives from the heater an amount of heat equal to 155 J

The heat engine per cycle receives from the heater an amount of heat equal to 155 J and gives the refrigerator an amount of heat equal to 85 J. Determine the efficiency of the machine.

The efficiency of a heat engine can be calculated using the formula:

η = ((Q1 – Q2) / Q1) * 100%, where Q1 is the amount of heat received from the heater (Q1 = 155 J), Q2 is the amount of heat given to the refrigerator (Q2 = 85 J).

Let’s calculate the efficiency of the heat engine:

η = ((Q1 – Q2) / Q1) * 100% = ((155 – 85) / 155) * 100% = 70/155 * 100% = 46.16%.

Answer: The efficiency of the heat engine is 46.16%.