Pipes 1, 2 and 3 are 300 m., 150 and 250 m. long and 25 cm. 12 cm. and 20 cm. diameter with friction factor f1, f2 and f3 equal to 0.019, 0.021 and 0.02 respectively and are connected in series. If the difference in elevation of the ends of the pipe is 10 m., what is the rate of flow in m3/sec? Neglect minor losses.

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.