A high-velocity water jet at 30 degrees celcious is proposed for use as a cutting device with possible applications in metal, concrete, and plastic. A sapphire nozzle with inlet diameter of 0.015m and outlet diameter of 1 x 10^-4m uses liquid water at a mass flow rate of 0.0065kg/s. The water discharges to 0.1MPa. IF the flow is isothermal, determine the pressure of the water source nedded to operate this device and the outlet velocity of the water