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.

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.