Water flows from a fire truck through a hose that is 11.7 cm in diameter and has a nozzle that is 2.0 cm in diameter. The firemen stand on a hill 5.0 m above the level of the truck. When the water leaves the nozzle, it has a speed of 20.0 m/s.

1)
Determine the minimum gauge pressure in the truck’s water tank.

h=5m v=20 m/s hose@r=.0585m and nozzle@radius=.01m
g=9.8 p=density of water=1000
P-Po=pgh

1 answer

P-Po=1000*9.8*5
P-Po=49000 Pa
Minimum gauge pressure in the truck’s water tank=49000 Pa