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Crank
2 years ago
9

Which statement best describes what happens when a sound source is moving? As the sound source approaches the observer, the pitc

h decreases and continues to do so as it passes the observer. As the sound approaches the observer, the pitch increases; as it passes the observer, the pitch decreases. As the sound source approaches the observer, the pitch decreases; as it passes the observer, the pitch increases. As the sound source approaches the observer, the pitch increases and continues to do so as it passes the observer.
Physics
2 answers:
Tems11 [23]2 years ago
5 0

Answer:

As the sound approaches the observer, the pitch increases; as it passes the observer, the pitch decreases.

Explanation:

As we know by the Doppler's effect of sound when sound source is approaching an observer then in that case the frequency of sound is given as

f' = f_o (\frac{v}{v-v_s})

so here the frequency of sound is more than the actual frequency

while if the source of sound is passing away from the observer then in that case the frequency of the sound observed by the observer is given as

f' = f(\frac{v}{v+v_s})

so here the frequency of the sound observed by the observer is less than the actual frequency

so correct answer will be

As the sound approaches the observer, the pitch increases; as it passes the observer, the pitch decreases.

sweet [91]2 years ago
4 0
The answer is B it increases as it goes toward you then decreases after it passes you
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Answer:

1. A.) The moment of the truck before it hits the brakes is 214,400 kg·m/s

B.) The force it takes to stop the truck is approximately 17,290.4 N

Explanation:

1. A.) The given parameters are;

The mass of the truck, m = 8,000 kg

The velocity of the truck when it hits the brakes, u = 26.8 m/s

Momentum = Mass × Velocity

The moment of the truck = The mass of the truck × The velocity of the truck

Therefore;

The moment of the truck before it hits the brakes = 8,000 kg × 26.8 m/s = 214,400 kg·m/s

B.) The amount of momentum lost when the truck comes to a stop = The initial momentum of the truck

The time it takes the truck to come to a complete stop, t = 12.4 s

The deceleration, "a" of the truck is given by the following kinematic equation of motion

v = u - a·t

Where;

v = The final velocity of the truck = 0 m/s

u = The initial velocity = 26.8 m/s

a = the deceleration of the truck

t = The time of deceleration of the truck = 12.4 s

Substituting the known values gives;

0 = 26.8 - a × 12.4

Therefore;

26.8 = a × 12.4

a = 26.8/12.4 ≈ 2.1613

The deceleration (negative acceleration) of the truck, a ≈ 2.1613 m/s²

Force = Mass × Acceleration

The force required to stop the truck = The mass pf the truck × The deceleration (negative acceleration) given to the truck

∴ The force it takes to stop the truck = 8,000 kg × 2.1613 m/s² ≈ 17,290.4 N.

8 0
3 years ago
Ms. Mary Mack walked around her block from her house for 200 meters. She arrived back at her house in 15 minutes. What was her d
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Answer:

d = 0 [m]

Explanation:

Displacement is understood as the length and direction that a body travels to move from an initial point to an endpoint.

This displacement is represented with a vector or straight line that indicates the distance of the displacement and its length.

This displacement in an easier way to understand. It is the distance between the start point and the endpoint of the journey. Since the second point is equal to the first point, since Mary returns to the same place, there is no difference between the displacement.

Therefore the displacement is zero.

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3 years ago
A particle (m = 4.3 × 10^-28 kg) starting from rest, experiences an acceleration of 2.4 × 10^7 m/s^2 for 5.0 s. What is its de B
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Answer:

Wavelength, \lambda=1.28\times 10^{-14}\ m

Explanation:

Given that,

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The De Broglie wavelength is given by :

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Answer:

The answer to your question is:

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There are two kinds of cell transport passive transportation and active transportation.

Passive transportation does not need energy because molecules move from higher concentration to lower concentration.

Active transportation needs energy because molecules moves against concentration.  

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b. passive transport Molecules move in favor of concentration so this answer is wrong.

c. osmosis is another example of passive transport so this answer is wrong.

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e. active transport this is the right answer.

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