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34kurt
4 years ago
12

When an earthquake occurs, the fastest wave is called a primary wave, or compression wave (P wave). This wave produces:

Physics
2 answers:
AleksAgata [21]4 years ago
8 0

Answer: (A) a back-and-forth motion on the surface of the earth

Explanation:

Earthquake generates seismic waves which are longitudinal waves.Longitudinal waves travel parallel in the direction of transfer of energy. Meaning that they travel in back and forth motion.

Longitudinal waves consist of compressions and rarefactions. When compressions occur when particles are close together and are regions of high pressure. Whereas, rarefactions occur when particles are further apart and regions of low pressure.


mash [69]4 years ago
8 0

Answer: Option (A)

Explanation: P waves are the primary seismic waves that travels at a speed of about 4-8 km/sec. It is the fastest wave. During an earthquake, this P wave along with S wave is generated, where S wave is known as the secondary waves.

P waves produces a back and forth type of motion, due to their compression and dilation effect when propagates through a rock medium in their direction of propagation. The rocks under the earth's surface undergoes compaction and extension due to this effect. It releases a certain amount of energy because of this wave propagation under the earth's surface.

Thus, the correct answer is option (A).

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Explanation:

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4 years ago
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By what factor must the amplitude of a sound wave be decreased in order to decrease the intensity by a factor of 3?
s344n2d4d5 [400]

Answer:

Amplitude is decreased by a factor of \sqrt3 if intensity is decreased by a factor of 3.

Explanation:

Intensity of a sound wave is directly proportional to the square of its amplitude.

Therefore, if intensity is I and amplitude is A, then

I=kA^2, where, k is constant of proportionality.

Now, if intensity of sound wave is decreased by a factor of 3. So,

New intensity is, I_{new}=\frac{I}{3}

I_{new}=kA_{new}^2\\\frac{I}{3}=kA_{new}^2

Plug in kA^2 for I. This gives,

\frac{kA^2}{3}=kA_{new}^2\\A_{new}^2=\frac{A^2}{3}\\A_{new}=\sqrt{\frac{A^2}{3}}=\frac{A}{\sqrt{3}}

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4 0
3 years ago
50 POINTS !!!
shepuryov [24]

Answer:

a) I = 464 kg m²,  b)  K = 631 .6 J, c)  v = 8.25 m / s

Explanation:

a) the moment of inertia of point particles is

          I = ∑ m_i r_i²

in this case

          I = 8 5² + 3 (-2) ² + 7 (-6) ²

          I = 464 kg m²

b) The kinetic energy is

          K = ½ I w²

          K = ½ 464 1.65²

          K = 631 .6 J

c) linear and angular velocity are related

          v = w r

          v = 1.65 5

          v = 8.25 m / s

8 0
3 years ago
a 13-gram bullet, moving at 270 m/s, penetrates a 2 kg block of wood and emerges at a speed of 130 m/s. if teh block sits one a
saveliy_v [14]

Answer:

1.52m/s

Explanation:

Using the law of conservation of momentum

m1u1 + m2u2 = (m1+m2)v

m1 and m2 are the masses

u1 and u2 are the initial velocities

v is the final velocity

Substitute the given values into the formula

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263.51 = 400v

v = 400/263.51

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Hence the velocity after the bullet emerges is 1.52m/s

6 0
3 years ago
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