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(3-b) Water flows through a 6-in.-diameter pipe with an average velocity of 4.5 m/s. Approximately what is the height of the largest roughness element

(3-b) Water flows through a 6-in.-diameter pipe with an average velocity of 4.5 m/s. Approximately what is the height of the largest roughness element allowed if this pipe is to be classified as smooth? Take the kinematic viscosity of 1.08 x 10-6 m/s

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