(a) Calculate the rate of heat transfer by radiation from a car radiator at 110oC into a 50.0oC environment, if the radiator has an emissivity of 0.750 and a 1.20 - m2 surface area.

(b) Is this a significant fraction of the heat transfer by an automobile engine? To answer this, assume a horsepower of 200 hp (1.5 kW) and the efficiency of automobile engines as 25%.