You would like to put a solar hot water system on your roof, but you're not sure it's feasible. a reference book on solar energy shows that the ground-level solar intensity in your city is 700w/m2 for at least 5 hours a day throughout most of the year. assuming that a completely black collector plate loses energy only by radiation, and that the air temperature is 20°c, what is the equilibrium temperature of a collector plate directly facing the sun? note that while a plate has two sides, only the side facing the sun will radiate because the opposite side will be well insulated.