(a) what is the rate of energy loss in watts per square meter through a glass window 3.0 mm thick if the outside temperature is -20 of and the inside temperature is 72 of ? (b) a storm window having the same thickness of glass is installed next to the first window, forming an air gap of 7.5 cm between the two glass panes (in other words, it is now a dual-pane window). what now is the rate of energy loss per unit area, if conduction is the only important energy-loss mechanism? (hint: thermal conductors in series
