A large closed tank is pressurized as shown. A jet of fluid issues from a small hole. Assume the flow is incompressible, irrotational, quasi-steady and the only body force acting is gravity. Determine the pressure, pb, required to increase the jet velocity by 50% relative to the value realized for atmospheric pressure, pa, in the upper chamber. Compute the value of pb in atm when h=10 m and density=998 kg/m^3. What is the jet velocity, U, for this pressure?