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4 years ago

What happens to the matter that makes up a liquid when sound travels through it

Physics

1 answer:

TiliK225 [7]4 years ago

4 0

Explanation:

The matter passes in the directions of the noise and flows from the source to a receiver like sound flows through a substance. As the sound flows through a fluid, the material is disrupted for an amount of time, but after the sound leaves, it restored to its normal location.

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If a force of 250N is applied to a piano being pushed up a ramp at an angle of 18degrees above the horizontal, what force is bei

klasskru [66]

answer

77.25 N

explanation

(look at picture for free body diagram)

the force on the piano has both vertical and horizontal components, and since the questions asks about the force to lift the piano, we want to find the vertical component

we can use trigonometry where sinA = opposite/hypotenuse

A = 18 degrees

hypotenuse = 250 N

sin18 = opposite (vertical component) / 250

vertical component = sin18 * 250

= 77.25 N

4 0

3 years ago

A stereo speaker is placed between two observers who are 40 m apart, along the line connecting them. if one observer records an

Nadya [2.5K]

The distance from observer A of intensity of sound 59 db is 28.64 m and the distance from observer B of intensity of sound 83 db is 11.36m

Explanation:

Let's solve this problem in parts

let's start by finding the intensity of the sound in each observer

observer A β = 59 db

β = $10 log\frac{I_a}{I_o}$

where I₀ = $1 \times 10^{-12}$ W / m²

$I_a = I_b \times 10 ^{ \frac{\beta}{10} }$

$I_a = 1\times 10 ^{-12} \times 10 ^{ \frac{59}{10} }$

$I_a$ = $2.51 \times 10 ^{-6}$ W / m²

Similarly for Observer b $I_b = 3.16 \times 10 ^ {-4}$

now we use that the emitted power that is constant is the intensity over the area of the sphere where the sound is distributed

P = I A

therefore for the two observers

the area of a sphere is

$A= 4\pi \times r^2$

we substitute the above formula, we get

Let us call the distance from the observer A be to stereo speaker = x, so the distance from the observer B to the stereo speaker = 40- x; we substitute

$I_a (35 -x) ^2 = I_b x^2$

after solving the above equation we get x = 28.64 m

This is the distance of observer A

similarly The distance from observer B is 35 - x

= 40 - 28.64

= 11.36m

To know more about intensity of sound with the given link

#SPJ4

6 0

1 year ago

A mass M is attached to an ideal massless spring. When this system is set in motion with amplitude A, it has a period T. What is

frutty [35]

<h2>Option B is the correct answer.</h2>

Explanation:

Period of a spring mass arrangement is given by

$T=2\pi\sqrt{\frac{m}{k}}$

where m is mass and k is spring constant.

So period of spring mass arrangement is independent of amplitude of motion.

Here amplitude changes from A to 2A.

Period for amplitude A is given by T.

Since period remains same for amplitude 2A also, the period is T.

Option B is the correct answer.

6 0

3 years ago

15 if an object gains_ it has an electrical charge

Papessa [141]

Answer:

15. electrons

16. electrometer

18. Transformers

24. Power

Explanation:

The fundamental charges in nature are electrons and protons.
The electrons have negative charges and protons have positive charges.
The proton with similar other protons forms the nucleus of an atom. Mostly it doesn't exist freely in nature. it is not easy to knock out a proton from an atom.
Whereas, the electrons were present in the outer sphere if the nucleus of an atom.Compared to a proton, It is easy to remove an electron from an atom.
So, if an object gains some electrons, it acquires some charges.
The amount of such charges can be measured using a device called electrometer.
The flow of electrons is associated with energy. This energy is called electrical energy and it can be converted into other forms of energy.
The rate at which electrical energy is converted to some other forms of energy is called electrical power.

4 0

4 years ago

The time that is required for a vibrating object to complete one full cycle is called : Group of answer choices

disa [49]

Answer:

Correct option : (c) period.

Explanation:

The time that is required for a vibrating object to complete one full cycle is called the time period. If f is the frequency of a wave, then the relation between the frequency and the time period is given by :

$T=\dfrac{1}{f}$

These are the characteristics of a wave. Some other characteristics are wavelength, amplitude, intensity etc. So, the correct option is (c) "period".

4 0

4 years ago