Air at 110C enters an 18-cm-diameter and 9-m-long duct at a velocity of 3 m/s. The duct

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Air at 110°C enters an 18-cm-diameter and 9-m-long duct at a velocity of 3 m/s. The duct is observed to be nearly isothermal at 85°C. The rate of heat loss from the air in the duct is
(a) 375 W

(b) 510 W

(c) 936 W

(d) 965 W

(e) 987 W

(For air, use k = 0.03095 W/m · K, Pr = 0.7111, v = 2.306 × 10-5 m2/s, cp = 1009 J/kg · K.)

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