Question: Water at (60^{circ} mathrm{F}) flows through a 6-in.-diameter pipe with an average velocity of (15 mathrm{ft} / mathrm{s}). Approximately what is the height of the

Water at $60^{\circ} \mathrm{F}$ flows through a 6-in.-diameter pipe with an average velocity of $15 \mathrm{ft} / \mathrm{s}$. Approximately what is the height of the largest roughness element allowed if this pipe is to be classified as smooth?

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