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:
<u>brainly.com/question/23265263</u>
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Different:
1. number of moons
2. size of rings
3. mass
4. temperature
5. type of rings
i might be wrong though.
Answer:
<< how fast is it going when it was caught? >>
Working formula is
Vf^2 - Vo^2 = 2gH
where
Vf = velocity of stone when it was caught
Vo = initial velocity = 20 m/sec.
g = acceleration due to gravity = 9.8 m/sec^2 (constant)
H = height at which stone was caught = 5 meters (given)
Substituting values,
Vf^2 - 20^2 = 2(9.8)(-5)
Vf^2 = 400 - 98
Vf^2 = 302
Vf = 17.38 m/sec.
<< how long did the trip take? >>
Formula is
H = Vo(T) + (1/2)gT^2
-5 = -20T + (1/2)(9.8)T^2
4.9T^2 - 20T + 5 = 0
Using the quadratic formula,
T = 3.81 seconds
Hope this helps.
Answer:
<em>16275 Joule</em>
Explanation:
<u>Work Done By A Constant Force
</u>
The work can be computed as
W=F.X, where F is the applied force (in this case, the force needed to overcome gravity)
Recall the second Newton's law which states that
Being the net force on a system of mass m and acceleration a
We know the helicopter is applying force against gravity because the speed of the shipwreck survivor changes from 4 m/s to 0 m/s in 15 meters
Let's calculate that acceleration by using the dynamics equation
Solving for a
a=-0.533\ m/sec^2
The negative sign indicates the body is braking, we'll later use the magnitude
The net force is, then
The only two forces acting upon the survivor is the lifting force of the helicopter and the weight of the man, so
Finally, the work done by the helicopter is
The work done by the helicopter is