Air (c p = 1007 J/kg K) enters a 17-cm-diameter and 4-m-long tube at 65C at

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Air (cp = 1007 J/kg · K) enters a 17-cm-diameter and 4-m-long tube at 65°C at a rate of 0.08 kg/s and leaves at 15°C. The tube is observed to be nearly isothermal at 5°C. The average convection heat transfer coefficient is
(a) 24.5 W/m2 · K

(b) 46.2 W/m2 · K

(c) 53.9 W/m2 · K

(d) 67.6 W/m2 · K

(e) 90.7 W/m2 · K

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