What is the estimated pressure drop per unit length in order to pump water at a volumetric flow rate of 0.03m3/s at 20C through a commercial steel pipe ( =4.6105m ) 20cm in diameter? (For water at 20C:=999kg/m3;= 1001106kg/m.s) Hint: i) Calculate the Reynolds number (Re) first! Determine whether the flow is turbulent or laminar. ii) Use Reynolds number to determine f! iii) Find pressure drop per unit length! A. 43.0Pa/m B. 45.0Pa/m C. 35.0Pa/m D. 33.0Pa/m E. 40.0Pa/m