4. Water flows through a straight 10-cm-diameter pipe at a diameter Reynolds number of 250,000. If the pipe roughness is 0.06 mm, what is the approximate Moody (Darcy) friction factor, f? Reference the Moody chart in Appendix 1 of the textbook (pg. 893). Hint: calculate the relative roughness with the given pipe properties (e/D) (a) 0.015 (b) 0.017 (c) 0.019 (d) 0.026 (e) 0.032