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Dafna11 [192]
2 years ago
5

Which of the following statements describes the law of inertia?

Physics
1 answer:
Drupady [299]2 years ago
8 0

Answer:

B. objects remain in the same state of motion unless a force acts on them

Explanation:

Sana nakatulong

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Muscular Endurance is the ability of a muscle to continue to perform without fatigue.
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One speaker generates sound waves with amplitude A.
raketka [301]

Answer:

iv) It is 9x bigger than before

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As the amplitudes of the new speakers add directly with the original one, taking into account the phase that they have, the composed amplitude of the sound wave is as follows:

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The intensity of the wave, assuming it propagates evenly in all directions, is constant at a given distance from the source, and can be expressed as follows:

I = P/A

where P= Power of the wave source, A= Area (for a point source, is equal to the surface area of a sphere of radius r, where is r is the distance to the source along a straight line)

For a sinusoidal wave, the power is proportional to the square of the amplitude, so the intensity is proportional to the square of the amplitude also.

If the amplitude changes increasing three times, the change in intensity will be proportional to the square of the change in amplitude, i.e., it will be 9 times bigger.

So, the statement iv) is the right one.

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