You are stoking a fire in a furnace, and you leave the stoker inside the furnace for several minutes. The end of the stoker inside the furnace reaches a temperature of 300°C, whereas the other end of the stoker in the air is cooled sufficiently to maintain a temperature of 60°C. The length of the stoker between these two ends is 2.0 m. If the cross-sectional area of the stoker is 0.0010 m2, determine the rate of heat transfer that occurs if (a) the stoker is made of aluminum (k = 237 W/m?K), (b) iron (k = 80.2 W/m?K), and (c) granite (k = 2.79 W/m?K).
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