A fireman clings to a vertical ladder and directs the nozzle of a hose horizontally toward a burning building. The rate of water flow is 6.28 kg/s, and the nozzle speed is 13.0 m/s. The fireman holds the nozzle 1.42 m vertically above his boots on the ladder. Choose the origin to be inside the hose by the fireman's feet.
What is the rate of change of angular momentum of the water?