A l-cm-diameter, 30-cm·long fin made of aluminum (k = 237 W/m·K) is attached to a surface at 80°C. The surface is exposed to ambient air at 22°C with a heat transfer coefficient of 18 W1m2·K. If the fin canbeassumed to be very long, the rate of heat transfer from thefin is
(a) 2.0W
(b) 3.2 W
(e) 4.4W
(d) 5.5 W
(e) 6.0W
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