The temperatures indoors and outdoors are 299 and 312 K, respectively. A Carnot air conditioner deposits 6.12x10^5 J of heat outdoors. How much heat is removed from the house?
The engine operates with efficiency 1 - 299/312 ≈ 0.042. If 6.12 x 10^5 J of heat are deposited, 6.12 x 10^5 J * 0.042 = 25500 J = 25.5 kJ were removed.
