1. The problem statement, all variables and given/known data ideal heat engine takes in heat Qin at a temp Th. It exhausts heat Qout a) how much work is done by the engine b) What is the effiency of the engine c) what is the exhaust temp of the engine 2. Relevant equations W = Qin - Qout Effiency = Qout/Qin E = Th-Tc/Th 3. The attempt at a solution i am pretty sure the frst two equations should give me what i need however its the third one that its a little stuck I need to find Exhaust Temp which i think shoud be Tc... so i rearranged the equation as shown E=Th-Tc/Th E x Th=Th-Tc E x 2Th = -Tc Tc= E x -2Th when i factor in the values Qin = 460J Qout = 285J and Th 600K i get a very cold answer and a number that shouldnt exist as a temp of -743.5K where have i gone wrong???