A triangular shaped fin on a rnotorcycle engine is 0.5-cm thick at its base and 3-cm long (normal distance between the base and the tip of the triangle), and is made of aluminum (k = 150 W/m·K). This fin is exposed to air with a convective heat transfer coefficient of 30 W/m2·K acting on its surfaces. The efficiency of the fin is 75 percent. If the fin base temperature is 130°C and the air temperature is 25°C, the heat transfer from this fin per unit width is
(a) 32 W/m
(b) 57 W/m
(c) 102 W/m
(d) 124 W/m
(e) 142 W/m
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