Air at 1 atm and 40C flows in a 8-cm-diameter pipe at a rate of 2500 L/min.

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Air at 1 atm and 40°C flows in a 8-cm-diameter pipe at a rate of 2500 L/min. The friction factor is determined from the Moody chart to be 0.027. The required power input to overcome the pressure drop for a pipe length of 150 m is

(a) 310 W 

(b) 188 W 

(c) 132 W 

(d) 81.7 W

(e) 35.9 W

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