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2 years ago

A special purpose nozzles that are often lowered through holes or other openings to the cellar of an occupancy are called

1 answer:

3 0

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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4 years ago

A 140 g baseball is moving horizontally to the right at 35 mis when it is hit by the bat. the ball fl ies off to the le ft at 55

Anit [1.1K]

Answer:

J = 12.32kg*m/s

Explanation:

Assumptions: I'm assuming mis is m/s

Given: The baseball's mass is 140g, so convert to kg, 0.140kg. (Good rule of thumb, in physics convert grams to kilograms). It is initially traveling 35 m/s to the right.

When it hits the bat, it flies left with a velocity of 55 m/s at an angle of 25°. To reiterate:

mass = 0.140kg, Initial: 35m/s, Final: 55m/s at an angle of 25°

For this problem, we have to use the impulse equation, but before that lets break the velocity into components (It will be apparent towards the end):

The initial velocity is moving only in the horizontal direction, so:

$v_{0x} = 35 m/s$

The final velocity has an x and a y component:

$v_{fx} = 55cos(25) = 49.84692829m/s\\v_{fy} = 55sin(25) = 23.2440044m/s$

Now the equation for impulse is (dp is Δp, which is difference in momentum; dv is Δv, the difference in velocity; J is impulse):

$J = dp= m*dv$

To get Δv, we have to find the difference of velocity, that is why we broke it into components. I'm going to define right as positive and left as negative. After that, we find the velocity vector:

$dv_{x} = (35-(-49.84692829)) = 84.84692829 m/s\\dv_{y} = (0-(23.2440044)) = -23.2440044 m/s\\dv = \sqrt{(84.84692829)^2+(-23.2440044)^2} = 87.97320604m/s$

Finally, substitute into the equation

$J = m*dv\\J = 0.140kg * 87.97320604m/s\\J = 12.31624885kg*m/s\\J = 12.32 kg*m/s$

J = 12.32kg*m/s

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3 years ago

I have my exam monday I need some help!

Lana71 [14]

Answer:

Explanation:

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The distance between the 2 crests (or troughs) is the wavelength, λ.

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3 years ago

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Explanation:

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