1. The problem statement, all variables and given/known data A heat engine takes in 1030 J of energy at 1000 K and exhausts 585 J at 250 K. What are the actual and maximum theoretical efficiencies of this heat engine? 2. Relevant equations For maximum efficiency I got 75 % by taking 1 - (250K / 1000K). For actual efficiency the equation is W/ Q or work out / heat in. 3. The attempt at a solution I am not sure where to start on this problem and any help would be very nice!