Firefighter Hose
Momentum question concerning a fire hose?
Water squirting from a hose emerges with a speed of 11 m/s at a rate of 110 kg/s. Compute the average reaction force exerted on the hose. (Have you ever seen firefighters working to control a large hose?)
answer in kN
F = q * ρ * Δv
q = flow rate, m^3 / s
ρ = fluid density, kg / m^3
v = jet velocity, m / s
(110 kg/s) * (1 m^3 / 1000 kg) = 0.11 m^3/s = q
F = 0.11 m^3/s * 1000 kg/m^3 * 11 m/s = 1210N
Hope this helps
Bill
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