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katen-ka-za [31]
2 years ago
12

Two people hear a tornado siren, but one listener is 81.9 times farther away from the source of the sound than the other. What i

s the intensity level of the sound (in decibels) for the more distant listener relative to that for the nearer listener
Physics
1 answer:
Stolb23 [73]2 years ago
3 0

-38.26dB is the intensity level of the sound for the more distant listener relative to that for the nearer listener

By using the <u>inverse square law,</u>

<u />

As one listener is 81.9 times farther away from the source of the sound than the other.

Then Increasing the distance by 81.9 times reduces the intensity by

81.9^{2} = 6707.61 times

The intensity level of the sound (in decibels) for the more distant listener relative to that for the nearer listener is:

= 10log(ratio of intensities)

= 10log(1/6707.61)

= 10log(0.000149)

=10 × -3.826

= -38.26dB (The negative sign represents the sound is less intense for the farther listener)

So, the intensity level of the sound (in decibels) for the more distant listener relative to that for the nearer listener is -38.26dB

Learn more about Intensity of sound here brainly.com/question/17062836

#SPJ4

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It's C because if you were trying to put it at rest that means you would put it on a Balanced surfest

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A running back holds 0.25 kg football and runs 100m down the football field. In addition to scoring six points for his team, he
katrin2010 [14]

Answer:

<h2>1) there is no work done on the system</h2><h2>2) A) Using a lever to lift 100 newtons up to 4 meters on to a shelf</h2><h2 /><h2>3) P = 140 W</h2><h2>4) D) In a closed system, a system that isolated from its surrounds, the total energy of the system is conserved</h2>

Explanation:

1) As we know that work done is the product of force and the displacement of the point of action where force is applied

So here we have

W = 0

as there is no displacement in the direction where the force is applied

2)As we know that work is product of force and displacement

So we will have

W_1 = 100 \times 4 = 400 J

W_2 = 200 \times 1 = 200 J

W_1 = 200 \times 1 = 200 J

W_1 = 100 \times 3 = 300 J

So maximum work is done on

A) Using a lever to lift 100 newtons up to 4 meters on to a shelf

3)

As we know that power is rate of work done

so we have

P = \frac{W}{t}

P = \frac{420}{3}

P = 140 W

4)

As per energy conservation we know that

D) In a closed system, a system that isolated from its surrounds, the total energy of the system is conserved

5 0
3 years ago
Describe the motion of an automobile on an east-west
Tanya [424]

Answer:

1. The automobile is traveling due east and is speeding up.

2. The car is traveling due east and is is slowing down.

3. The automobile is traveling due east at a constant speed.

4. The car is traveling due west and is slowing down.

5. The automobile is traveling due west and is speeding up.

6. The automobile is traveling due west at a constant speed.

7. The automobile is accelerating due east from rest.

8. The automobile is accelerating due west from rest.

Explanation:

The key to understanding this is:

When the acceleration and initial velocity of the automobile have the same sign (positive or negative) then the automobile is speeding up. Explained further, if acceleration and the initial velocity are both positive or they are both negative the automobile is speeding up but whenever they have opposite signs (that is acceleration is positive and initial velocity is negative or vice versa) the automobile is slowing down. When the acceleration is zero the automobile is maintaining a unform motion at a constant speed (the speed is not changing with time). The + or - sign indicates the direction of travel. In this case east is + and west is -. It is my pleasure answering this question. I hope you find it helpful. Thank you.

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3 years ago
Low birth rates, death rates are constant
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1 is b high birth rate and death rate 2 is a low birth rates death are constant and 3 is c high birth rate and low death rate

Explanation:

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3 years ago
Air resistance is a nonconservative force. It always opposes the motion of an object. An airplane flies from New York to Atlanta
gulaghasi [49]

Answer:

c. is negative

Explanation:

When the magnitude of force is multiplied with the force vector's projection along the direction of the vector of displacement which is negative as it is a resistive force we get the work done.

As the wind is acting in opposite direction of the force which is being applied by the plane the work done will be negative. Also, the net work will be the sum of many smaller negative quantities.

Hence, the answer here is negative.

6 0
3 years ago
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