Hose Nozzles
Posted in Garden Antiques on 06/29/2009 02:30 pm by adminphysics help please! how fast does the water move through a garden hose nozzle?
A garden hose of inner diameter 2.2 cm carries water at 2.5 m/s. The nozzle at the end has diameter 0.41 cm. How fast does the water move through the nozzle?
It moves at higher speed.
Flow of water = Area*Velocity
According to Newton Flow of water into the tube must equal flow of water out of the tube
So FL(in)=FL(out)
Area1*Velocity1=Area2*Velocity2
Area of inner diameter = pi*r*r=pi*1.1*1.1(radius = diameter/2=2.2/2)
pi*1.1*1.1*2.5=pi*0.21*0.21*Velocity2
Now Velocity 2=68.59m/s
Think of it this way, the water travels at 2.5m/s when the passage was 2.2cm. When your reducing the gap, the water pressure at the walls makes it come out with more speed to maintain the pressure.
Please read the source it offers good explanation.
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