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2. The flat roof of a building has an emissivity of 0.8 and an absorptivity of 0.9 for solar radiation. The sun beats down at midway with an intensity of 947 W/m. a) If the temperature of the air of the surroundings is 20C, if the wind velocity is negligible and if no heat penetrates the roof, what is the equilibrium temperature of the roof? Effective temperature of the space is -70C. For the rate of heat transfer by conduction-convection, use Q/A=0.38 (AT) 125, where AT is the temperature drop between roof and air, b) what fraction of heat from the roof is lost by radiation