A special purpose nozzles that are often lowered through holes or other openings to the cellar of an occupancy are called cellar nozzles.
What is a nozzle:
A nozzle is a device in which steadily flowing fluid can be made to accelerate by a pressure drop along the duct in a cross-sectional area.
So when a fluid flows through a nozzle, its velocity increases continuously and pressure decreases continuously.
There are different types of tips like hollow cone, solid cone or flat fan.
The cellar nozzle (also called a Bresnan nozzle) is designed to be used under the surface the operator is standing on.
Hence,
The cellar nozzles are often lowered through holes or other opening to the cellar of an occupancy.
Learn more about nozzles here:
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Answer:
a) 4.1 J
b) -14 J
c) 4.8 m/s
Explanation:
The energy stored in the spring is given by:
The mechanical energy loss is because of the work done by the friction force.
The friction force (only presented on the inclined surface) is given by:
We need to calculate the length of the ramp in order to calculate the work, the length of the ramp is the hypotenuse:
So the work done by the friction force is:
the angle is 180 degrees because the force is opposite to the motion.
In order the know the final velocity we need to apply the Energy Conservation Theorem:
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