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3 years ago

When you push down on a block resting on a table, block atoms and table atoms that are in contact with one another

2 answers:

5 0

Maintain their positions.

Solids are incompressible, just like liquids. The electrostatic forces between the atoms of block and the atoms of table prevent the two objects from moving into one another.

Ulleksa [173]3 years ago

3 0

Answer:

<h2>A. maintain their positions.</h2>

Explanation:

Both objects maintain their position, because the force being applied is in vertical direction, since that is a push down, the reaction force of the table upwards the block doesn't allow movement at all.

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What is work done in physics and how can it be calculated

shusha [124]

Work is done when a force is applied to an object moves that object. the work is calculated by multiplying the force by the amount of movement of an object

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3 years ago

Read 2 more answers

Although 0 dB is often referred to as the lower threshold of human hearing, it is important to realize that the human ear is not

d1i1m1o1n [39]

Answer:

a) 3000 Hz;

b) 30 dB;

c) 1000 times.

Explanation:

a) From the human audiogram given on the figure below the black line represents the threshold for hearing the sound at each frequency. We see that the least intensity is necessary for the frequency of about 3000 Hz.

b) Using the same audiogram we see that we would need the sound of the intensity of about 30dB.

c) The least perceptible sound at 1000 Hz must be 0dB while at 100 Hz it is 30dB. These are logarithmic quantities. To transform them to the linear quantities we use the formula

$I(\text{in dB})=10\log\frac{I}{I_0(\text{at }1000\text{ Hz})},$

where $I_0(\text{at }1000\text{ Hz})$ is the hearing threshold at 1000 Hz.

Therefore we have the following

$0\text{ dB}=10\log\frac{I_1}{I_0(\text{at }1000\text{ Hz})}\quad 30\text{ dB}=10\log\frac{I_2}{I_0(\text{at }1000\text{ Hz})}$

$I_1$ is the threshold at 1000Hz and $I_2$ is the threshold at 100Hz.

By exponentiating we have

$10^0=\frac{I_1}{I_0(\text{at }1000\text{ Hz})},\quad 10^3=\frac{I_2}{I_0\text{at }1000\text{ Hz}}.$

Now dividing these two equations we get

$\frac{I_2}{I_1}=\frac{10^3}{10^0}=1000.$

Therefore, the least perceptible sound at 100Hz is 1000 times more intense than the least perceptible sound at 1000Hz.

Note: I got these values unisng the audiogram that is attached here. The one that you have might be slightly different and might yield different answers.

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3 years ago

What happens to a wave if its frequency decreases?

iragen [17]

Answer:hen frequency increases more wave crests pass a fixed point each second. That means the wavelength shortens. So, as frequency increases, wavelength decreases. The opposite is also true—as frequency decreases, wavelength increases.

Explanation:brainliest please

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3 years ago

Dust and gas are pulled together by the force known as what?

olga nikolaevna [1]

Answer:

Gravity

Explanation:

In astronomy, dust and gas get pulled together by gravity forming Nebula's, famous nebula's include the Crab Nebula, Orion Nebula and Helix Nebula.

Most of the Nebula's consist of hydrogen.

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4 years ago

Which describes an object in projectile motion

alukav5142 [94]

Answer:

Gravity acts to push the object sideways

Explanation:

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3 years ago