Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The top and bottom surfaces of the rod are maintained at constant temperatures of 20 °C and 95 °C, respectively, while the side surface is perfectly insulated. Determine the rate of heat transfer through the rod if it is made of (a) copper, k = 380 W/m-K, (b) steel, k = 18 W/m-K, and (c) granite, k= 1.2 W/m K.
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