(Solved): 8.34 Where Water at \( 60^{\circ} \mathrm{F} \) flows through a 6-in.-diameter pipe with an average ...

8.34 Where 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?