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4 years ago

13

When a sound source is moving away from an observer, the observer will hear a lower pitch. This is due to

2 answers:

Art [367]4 years ago

6 0

a decrease in the frequency of the sound wave.

Explanation:

When a sound source is moving away from an observer, the observer will hear a lower pitch due to a decrease in the frequency of the sound wave. This is known as the Doppler's effect.

As the sound source moves closer to the observer, they hear a higher pitch in the reverse process.
A sound wave transmits vibrational energy from the source to the hearer.
A sound wave has frequency, amplitude, velocity and wavelength just like other wave types.
The frequency of a wave is the number of waves that passes through a point at a time.
This is related to the the wavelength of a wave.
Waves of a high frequency are known to have short wavelengths and vice versa.
To hear a low pitch, the source moves away and the wavelength between successive crests and troughs on a wave increases considerably.

Learn more:

Sound waves brainly.com/question/2845448

#learnwithBrainly

shepuryov [24]4 years ago

5 0

Answer:

its the last one

Explanation:

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Four penguins that are being playfully pulled along very slippery (frictionless) ice by a curator. The masses of three penguins

Sati [7]

Answer:

$m_2 = 23 kg$

Explanation:

As we know that the tension in two strings are

$T_2 = 111 N$

$T_4 = 222 N$

now we have

$F_{net} = ma$

so we can say

$(m_1 + m_2)a = T_2$

$(12 + m_2)a = 111$

also we have

$(m_1 + m_2 + m_3 + m_4) a = T_4$

$(12 + m_2 + 15 + 20) a = 222$

now divide two equations

$\frac{222}{111} = \frac{47 + m_2}{12 + m_2}$

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4 years ago

A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes.

Jobisdone [24]

Answer:

F=507.7N

Explanation:

According to Newton's second law:

$\sum F=m.a$

in this case, the football players need to drag the coach at a constant velocity, thus means with no acceleration, so:

$\sum F=0\\\\-F_f+F_p*cos(\theta)=0\\\\$

there are 20 degrees between the two ropes that means each player exerts a force 10 degrees from the zero reference.

$F_p=2*F\\\\F=\frac{1000N}{2*cos(10)}\\\\F=507.7N$

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3 years ago

Identify the law that describes how rock layers settle over time

Lynna [10]

This is the Law of Horizontality

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3 years ago

Alex has a 100 cm ruler pivoted at the centre. She ties a balloon filled with carbon doxide 16 cm from the pivot The total weigh

Leona [35]

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3 years ago

You are driving at 25 m/s with your cruise control on when you see a fallen tree in the road. It takes you 0.30 s to put on the

xxTIMURxx [149]

Explanation:

Given data

velocity v= 25m/s

The time it takes to put on brake t= 0.3s

the distance covered when the brake was put on is

v=s/t

s= v*t

s= 25*0.3s

s= 7.5m

hence the distance covered is 7.5m

Also the rate of decrease in aceleration is 5m/s^2

we can also calculate the distance covered at this rate

v^2=u^2+2as

25^2= 0+2*5*s

625=10s

divide both sides by 10

s=625/10

s= 62.5m

The total distance covered between putting on the brakes and decelareation is 7.5+62.5= 70m

Given that the tree is 75m ahead, the car would not hit the tree

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3 years ago