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musickatia [10]
4 years ago
5

what causes sounds? A. electromagnectic energy B. the release of sensory neurons C.movement that causes changes in air placement

D.vibrations that cause changes in air pressure
Physics
2 answers:
Pani-rosa [81]4 years ago
4 0

Answer:

Option D

Vibrations that cause changes in air pressure

Explanation:

Sound is the disturbance or vibration of longitudinal mechanical waves which cause change in air pressure through a medium such as gas, liquid or solid. Therefore, what causes sound are these vibrations which subsequently cause changes in air pressure. When sound is transmitted and reflected, we call it pitch.

bogdanovich [222]4 years ago
3 0

Answer:

D.vibrations that cause changes in air pressure

Explanation:

Sound is a type of wave.

A wave is a periodic disturbance/oscillation that trasmits energy without transmitting matter. There are two different types of waves:

- Transverse waves: in a transverse wave, the direction of the oscillation is perpendicular to the direction of motion of the wave. These waves are characterized by the presence of crests (points of maximum positive displacement) and troughs (points of maximum negative displacement). Examples of transverse wave are electromagnetic waves.

- Longitudinal waves: in a longitudinal wave, the direction of the oscillation is parallel to the direction of motion of the wave. These waves are characterized by the presence of compressions (regions where the density of particle is higher) and rarefactions (regions where the density of particle is lower). Examples of longitudinal waves are sound waves.

Sound waves, in particular, consist of vibrations of the particles in a medium - most commonly, air - that occur back and forth along the direction of motion of the wave. Because of these motion, the air will have areas of higher pressure (which correspond to the compressions), where the density of particles is higher, and areas of lower pressure (which correspond to the rarefactions), where density of particles is lower.

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Is nucleus found in animal cells
Luden [163]

Answer:

yes nucleus is found in plant and animal cells.

Hope this helps :)

5 0
3 years ago
Complete the calculations for total magnification produced by various combinations of the eyepiece and objective lenses. You may
lesya692 [45]

Answer:

a) m_ttoal = 40x , b)     m_total = 100X , c) m_total = 400X ,

d)     m_total = 1000 X

Explanation:

La magnificación o aumentos es el incremento de del tamaño de la imagen con respecto al tamaño original del objeto, en la mayoria del os sistema optico la magnificacion total es  el producoto de la magnificación del objetivo por la magnificación del ocular

       

    m_total = m_ objetivo  * m=ocular

apliquemos esto a nuestro caso

1)  m_total = 4 x * 10 x

    m_ttoal = 40x

2)  m_total = 10X * 10X

    m_total = 100X

3)mtotal = 40X * 10X

     m_total = 400X

4) m _totla = 100x * 10 X

     m_total = 1000 X

en este ultimo caso para magnificación grandes es decalcificar el objeto

4 0
3 years ago
What term is commonly used to refer to the bending of light
Artemon [7]
It can either be refraction or diffraction.

refraction - bending of a wave or light as it passes from one medium into another, or as it passes through a non-uniform medium.

diffraction - bending of a wave or light in a homogeneous medium around obstacles or through a narrow opening.

As you can see the difference between the two is that diffraction is related to obstacles or narrow openings.

hope this helps :)


3 0
3 years ago
Read 2 more answers
What is the theory of time called?
murzikaleks [220]
I think its Eternalism
7 0
3 years ago
Read 2 more answers
a door 1.00m wide, of mass 15kg can rotate freely about a vertical axis through its hinges. A bullet with a mass of 10 g and a s
Anton [14]

Answer:

This question contains collision of rotational objects, so we should use angular momentum.

L = \omega I or L = r \times mv

By conversation of angular momentum;

L_1 = L_2

|L_1| = rmv\sin(\theta) = rmv\sin(\pi/2) = rmv since the bullet hits the door in a direction perpendicular to the plane of the door.

r = 0.5m, the distance from the center of the door to the hinges.

L_1 = (0.5)(0.01)(400) = 2 kg*m^2/s

After the collision the bullet embeds itself to the door. Now the door and the bullet is a combined object with mass 15,01 kg.

I = I_{door} + I_{bullet} = \frac{1}{3}Ma^2 + mr^2

where a is the width of the door, and the bullet can be considered as a point particle.

I = \frac{1}{3}15(1)^2 + (0.01)(0.5)^2 = 5 + 0.0025 = 5.0025 kg * m^2

L_1 = L_2\\2 = 5.0025 \omega\\\omega = 0.399 rad/s

Explanation:

The calculation of moment of inertia of a rectangular door rotating around its hinges is a bit long. But the answer is in every standard textbook. It is safe to use it without deriving it ourselves.

8 0
4 years ago
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