Advanced Physics

Water flows from a reservoir into a rigid horizontal pipe whose intake is 52m below the surface elevation of the reservoir. The pipe discharges through a valve into the atmosphere and is 0.6m in diameter and 1.5km long. Assuming a rigid water column calculate the pressure rise at the valve if it is closed in 4.5 seconds. Assume a friction factor of 0.008. If the valve is re-opened at some later time, calculate the time taken for the flow to accelerate to 65% of its steady state value.(120.63m, 8.3s)