A village maintains a large tank with an open top, containing
water for emergencies. The water can drain from the tank through
a hose of diameter 6.70 cm. The hose ends with a nozzle of
diameter 2.15 cm. A rubber stopper is inserted into the nozzle.
The water level in the tank is kept 7.50 m above the nozzle. (a)
Calculate the friction force exerted by the nozzle on the (b)
The stopper is removed. What mass of water flows from the nozzle
in 2.00 h? (c) Calculate the gauge pressure of the flowing water
in the hose just behind the nozzle.