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correct answers are listed below. can you please show the work! A rectangular fin 1.0 ft long 1.0ft wide, and 2 in thick loses heat

correct answers are listed below. can you please show the work!
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A rectangular fin 1.0 ft long 1.0ft wide, and 2 in thick loses heat to the atmosphere at 70F. The base of the fin is at 270F. If h= 2 Btu/h . ft? . F and the thermal conductivity of the fin is 24 Btu/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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