Air at (1 mathrm{~atm}) and (25^{circ} mathrm{C}) flows in a 4-cm-diameter glass pipe at a velocity of

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Air at \(1 \mathrm{~atm}\) and \(25^{\circ} \mathrm{C}\) flows in a 4-cm-diameter glass pipe at a velocity of \(7 \mathrm{~m} / \mathrm{s}\). The friction factor for this flow is

(a) 0.0266

(b) 0.0293

(c) 0.0313

(d) 0.0176

(e) 0.0157

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