Q. Water flows through a horizontal tube of diameter 3.0 m that is joined to a second horizontal tube of diameter 2.2 . The pressure difference between the tubes is 8.0 kpa . Find the speed of flow in the first tube.
Q. The loaded cab of an elevator has a mass of 3.0 x10^3 kg and moves 226 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?