1. The problem statement, all variables and given/known data The figure (http://session.masteringphysics.com/problemAsset/1001463/8/knight_Figure_19_54.jpg) shows the cycle for a heat engine that uses a gas having a specific heat ratio = 1.25 . The initial temperature is T1 = 300K ,and this engine operates at 20 cycles per second. a) What is the power output of the engine? b)What is the engine's thermal efficiency? 2. Relevant equations P=W/t Not sure what else. 3. The attempt at a solution T1=T2=300K P1*V1=P2*V2 (1)(600)/200=3atm=P2=P3 P1/T1=P3/T3 (300)(3)/1=900K=T3 Don't know where to go next.