A fin with a rectangular cross section is attached to a base that has a temperature of Tb. The fin tip is exposed to convection but a length correction can be done to treat the tip as an insulated one. The fin is exposed to an ambience of 50 C with a convection heat transfer coefficient of 10 W/(m2.C). Thermal conductivity of the fin material is 200 W/(m.c). Following is the geometric information. Length = 7.5 cm Thickness = 3 mm Width (into the paper) = 1 m. If the heat transfer rate from the fin is 360 W, determine the base temperature Tb. (25 points) Too 50C h - 10 W/(m 15 cm W = 11 K = 200 W/(m imc) lemn Cross section of the fin