Rectangular cross sectional area fin (L = 12 cm, thickness 8 mm, width w = 80 cm) is attached to a wall maintained at 150 °C. Thermal conductivity of the fin is k = 50 W/m °C. Heat dissipate to environment by convection only with h = 20 W/m² °C, and To = 25 °C. Determine a) which case fits best to evaluate the heat loss and temperature variation of this fin (show your calculation), b) show a method to calculate easily the temperature at the tip of the fin as well as the rate of heat

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