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3 years ago

Which statement about atmospheric pressure near earth's surface is true

Physics

1 answer:

Artemon [7]3 years ago

7 0

The correct answer is it decreases as someone moves away from earth's surface.

The atmospheric pressure decreases when you go near the surface of the earth. Atmospheric pressure can also be referred to as barometric pressure.

This is the pressure which is being found in the earth's atmosphere. It is approximated by pressure of hydrostatic which is known to be caused by weight of air where the measurement points are above.

When elevation increases, there is decrease in atmospheric pressure.

Force per unit are is measured by pressure.

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Why does water that is frozen in an ice cube tray stay in the shape of a cube when it is

quester [9]

The Answer is B : The water particles become locked in place.

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3 years ago

A child has an ear canal that is 1.3 cm long. Assume the speed of sound is v = 344 m/s.

kap26 [50]

Answer:

The frequencies are $(f, f_1) = (6615.4 \ Hz , 19846.2\ Hz)$

Explanation:

From the question we are told that

The length of the ear canal is $l = 1.3 \ cm =\frac{1.3}{100} = 0.013 \ m$

The speed of sound is assumed to be $v_s = 344 \ m/s$

Now taking look at a typical ear canal we see that we assume it is a closed pipe

Now the fundamental harmonics for the pipe(ear canal) is mathematically represented as

$f = \frac{v_s}{4 * l }$

substituting values

$f = \frac{344}{4 * 0.013 }$

$f = 6615.4 \ Hz$

Also the the second harmonic for the pipe (ear canal) is mathematically represented as

$f_1 = \frac{3v_s}{4 * l}$

substituting values

$f_1 = \frac{3 * 344}{4 * 0.013}$

$f_1 = 19846.2 \ Hz$

Given that sound would be loudest in the pipe at the frequency, it implies that the child will have an increased audible sensitivity at this frequencies

6 0

3 years ago

Covalent bonds form when electrons are

NeX [460]

It would be A) shared

8 0

3 years ago

Read 2 more answers

How does mass affect the change in velocity of an object? Immersive Reader

Bas_tet [7]

Answer:

I would say the 3rd one

Explanation:

5 0

2 years ago

An echo is heard from a cliff 3.71 s after a rifle is fired. How many feet away is the cliff

LenKa [72]

The cliff is 2042 ft away.

We know that the speed of sound in air is directly proportional to the absolute temperature.

First convert the Fahrenheit temperature to Celsius;

°C = 5/9(44.5 - 32)

°C = 6.9 °C

Applying the formula;

V1/V2 = √T1/T2

Where; V1 = velocity of sound in air at 0°C

V2 = Velocity of sound in air at 6.9 °C

1087/V2 = √273/279.9

V2= 1101 ft/s

Given that; V = 2s/t

Where s is the distance of the cliff

t is the time taken

1101 ft/s = 2s/3.71 s

s = 1101 ft/s × 3.71 s/2

s = 2042 ft

Learn more:brainly.com/question/15381147

3 0

3 years ago