the open tank in fig. p3.14 contains water at 20°c and is being filled through section 1. assume incompressible flow. first derive an analytic expression for the water-level change dh/dt in terms of arbitrary volume flows (c1, c2, 93) and tank diameter d. then, if the water level h is constant, determine the exit velocity v2 for the given data 3 m/s and 0,