(a) The outer surface of a skier's clothes of emissivity 0.700 is at a temperature of 4.10° C. Find the rate of radiation if the skier has a surface area of 1.50 m2 and the surroundings are at -13.0° C.
(b) The exterior walls of a house have a total area of 204 m2 and are at 11.4°C and the surrounding air is at 7.4° C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 3.4 W/(m2 · C°).