On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 20 kW. At what rate is the entropy of the air outside the house changing as a result of this process?
- +500 W/K
- -1000 W/K
- +79 W/K
- +1000 W/K
- +99 W/K
