Steam is leaving a 4-l pressure cooker whose operating pressure is 150 kpa. it is observed that the amount of liquid in the cooker has decreased by 0.6 l in 40 min after the steady operating conditions are established, and the cross-sectional area of the exit opening is 8 mm2. saturation conditions exist within the cooker at all times so that steam leaves the cooker as a saturated vapor at the cooker pressure. determine (a) the mass flow rate of the steam and the exit velocity, (b) the flow energies (pv) of the steam per unit mass, and (c) the rate at which energy leaves the cooker by steam. ignore the potential energy.