A 1-cm-diameter, 30-cm long fin made of aluminum (k = 237 W/m•ºC) is attached to a surface at 80ºC. The surface is exposed to ambient air at 22ºC with a heat transfer coefficient of 18 W/m2•ºC. If the fin can be assumed to be very long, the rate of heat transfer from the fin is
(a) 2.0 W
(b) 3.2 W
(c) 4.4 W
(d) 5.5 W
(e) 6.0 W
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