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A 100-m long horizontal pipe carries water at an average velocity of 2.5 m/s. The required...

A 100-m long horizontal pipe carries water at an average velocity of 2.5 m/s. The required pressure drop, deltaP, across the length of the pipe required to achieve this is 1.5 x 10^5Pa, and the surface roughness to diameter ratio of the inside of the pipe is k/D= 0.004. What is the diameter of the pipe?

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