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3 years ago

A boy is playing with a water hose, which has an exit area of

Physics

1 answer:

Nookie1986 [14]3 years ago

7 0

Answer:

The exit velocity of water is B. 15 m/s.

Explanation:

According to equation of continuity, for a steady flow of water, the volume of liquid entering a pipe in 1 second is equal to the volume that leaves per second.

If the initial exit area of the pipe is A₁ and the speed of exit is v₁ and the final exit area is A₂ and its corresponding exit velocity is v₂, then,

Rewrite the expression for v₂.

Substitute 10 cm² for A₁, 2 cm² for A₂ and 3 m/s for v₁.

The exit speed of water from the hose is 15 m/s.

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Determine the length of a wind instrument, assuming that it is modeled as a closed tube and that the lowest sound that it can pl

Alex787 [66]

Answer:

Length, l = 0.866 meters

Explanation:

Given that,

Frequency of sound, f = 99 Hz

Speed of sound in air, v = 343 m/s

To find,

The length of a wind instrument.

Solution,

The standing wave will gets formed in wind instrument. For the closed tube, the closed tube the frequency is given by :

$f=\dfrac{v}{4l}$

Where

l is the length of the instrument

$l=\dfrac{v}{4f}$

$l=\dfrac{343\ m/s}{4\times 99\ Hz}$

l = 0.866 meters

So, the length of a wind instrument is 0.866 meters. Hence, this is the required solution.

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3 years ago

What causes an atom to be neutral? Equal number of protons and neutrons Equal distance between the nucleus and electrons Equal n

pishuonlain [190]

C. Equal number of electrons and protons

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3 years ago

Why does a person feel cooler under a rotating fan?

sladkih [1.3K]

What a fan does is create a wind chill effect. ... By blowing air around, the fan makes it easier for the air to evaporate sweat from your skin, which is how you eliminate body heat. The more evaporation, the cooler you feel.

4 0

3 years ago

Three collinear forces,F1=45N west,F2=63N east and an unknown force F3 are applied to an object.The resultant force of the three

Greeley [361]

Take east to be the positive direction. Then the resultant force from adding F₁ and F₂ is

F₁ + F₂ = (-45 N) + 63 N = 18 N

which is positive, so it's directed east.

To this we add a third force F₃ such that the resultant is 12 N pointing west, making it negative, so that

18 N + F₃ = -12 N

F₃ = -30 N

So F₃ has a magnitude of 30 N and points west.

6 0

3 years ago

Write a question you would like to see on a quiz to calculate NET FORCE.

Pie

Answer:

How do you find the net force?

Explanation:

i think this is want you asked for?

5 0

2 years ago