Oil (specific gravity =0.84; viscosity =0.05 N−s/m₂) flows through a horizontal 4 kilometer long new concrete pipe with a diameter of 94 cm. The oil velocity is 2.4 m/s. What is the pump head in meters? How much pumping power is needed to maintain the flow? The pipe has 10 regular elbows and 3 fully open gate valves. How much power is needed to maintain the flow?