Air at 30°C flows over a 3.0-cm-outer-diameter, 45-m-long pipe with a velocity of 6 m/s. Calculate the drag force exerted on the pipe by the air. (Air properties at 30°C are: ? = 1.164 kg/m3, ? = 1.608 × 10−5 m2/s.) (a) 19.3 N (b) 36.8 N (c) 49.3 N (d ) 53.9 N (e) 60.1 N

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