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Question: A smooth pipe carries water at a bulk velocity of 15 ft/s. The inside diameter of the pipe is 1 in. Use the universal velocity profile to calculate the shear stress at the wall.

2. Water at 60°F flows through a straight section of 100 ft of 1-in. Schedule 40 pipe. At a bulk velocity of 5 ft/s the total pressure drop over the 100 ft is 3 psi. Calculate the thickness of the viscous sublayer inside the pipe. What is the equivalent roughness height for this pipe? Would the pipe be considered completely rough or hydraulically smooth under the given conditions?

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