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copper fin 1.0 mm thick is placed on a circular tube. The out side daiameter of the tube is 2.5 cm. The fin long is 8 mm and the thermal conductivity is 379 W/m °C. The tube wall is maintained at 473K. The fin is exposed to an environment with h = 30 W/m "C and T∞= 288K. %3D Calculate the heat lost by the fin.