A rectangular fin 1.0 ft long, 1.0 ft wide, and 2in. thick loses heat to the atmosphere at70 F. The base of the fin is at 270 F.If h = 2Btu/h*ft2* F and the thermal conductivity of the fin is 24Btu/h*ft* F, find:(a) The fin efficiency.(b) The total rate of heat loss from the fin.Ans. (a) 70.5%. (b) 712 Btu/h.

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