The solution of the problem 1.76 cr 1 from the problem

The solution of the problem 1.76 cr 1 from the problem

Task 1.76
With a direct Carnot cycle, the heat engine performs a job of 1000 J. The heater temperature is 500 K, the temperature of the refrigerator is 300 K. Determine the amount of heat received by the machine from the heater.