4.4 A Gearbox A gearbox with power output of 40 kW has a transmission efficiency of 92%. The gearbox is exposed to an environment at 20C, and its overall heat transfer coefficient in Newton's law of cooling (4.35) is aA = 60 K Determine the temperature of the transmission in steady state, the entropy generation rate in the gearbox, the entropy generation rate for the heat transfer between gearbox and environment, and the total entropy generation. (Hint: A good sketch will help you, as in Fig. 4.7 of textbook).