A vertical cylindrical tank 3 m in diameter has a circular orifice 10 cm in diameter on the vertical side at its bottom. The tank is filled with water such that the head over the orifice is 7 m. If Cᵥ = 0.98 and C꜀ = 0.61, *determine (a) the interval of time for the velocity of the jet issuing at the orifice to change from 10 m/s to 7 m/s. Assume that the velocity of approach is negligible. *what is the head when the velocity is (b) 10 m/s? Assume that the velocity of approach is negligible..... *what is the head when the velocity is (c) 7 m/s? Assume that the velocity of approach is negligible....

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A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?