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4. Oil of viscosity 2E-5 m2/s flows at 210 L/s through a pipe of roughness 0.038...

4. Oil of viscosity 2E-5 m2/s flows at 210 L/s through a pipe of roughness 0.038 mm. The head loss through the pipe is 0.42 m for every 100 m pipe length. Find the theoretical pipe diameter, in m, required to handle this situation.

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