Question

What is the velocity of water at the nozzle of a 50. cm^2 fire hose if the city mains are 254 cm^2 in area and if the velocity of water in the mains is 4.5 m/s ?

Answer 1

Continuity equation:

$$A_1v_1=A_2v_2\\ (50)v_1=(254)(4.5)\\v_1=22.9\frac{m}{s}$$