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Amanda [17]
3 years ago
7

What frequency will you hear if a truck is driving toward you at 20 m/s sounding a horn of frequency 300 Hz. Assume the speed of

sound to be 340 m/s.
Physics
1 answer:
Damm [24]3 years ago
6 0

Answer:

=319Hz

Explanation:

This question is on sound waves

General formulae;

Frequency of observer= f of source*[ (v of sound+ v of observer)/(v of sound-v of source)]

where f is frequency and v is velocity

Given;

Velocity of sound = 340m/s

frequency of source = 300 Hz

Velocity of observer=0m/s

Velocity of source/truck= 20m/s

Substitute values in the formulae;

Frequency of observer= 300× {(340+0)/(340-20)}

                                       =300×{ 340/320}

                                       =300×340/320

                                       =318.75

                                       =319Hz

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Answer:

Lone pairs cause bond angles to deviate away from the ideal bond angles

Explanation:

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2 years ago
A long distance runner sees the finish line and accelerates at a rate in 1.2 m/s2 for
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Answer: he did travel 15 meters.

Explanation:

We have the data:

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Then we start writing the acceleration:

a(t) = 1.2 m/s^2

now for the velocity, we integrate over time:

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Because we want to know the displacementin those 3 seconds ( p(3s) - p(0s)) we can use p0 = 0m

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6 0
2 years ago
An airplane accelerates from a velocity of 22 m/s to 40 m/s with an acceleration of 2 m/s2. How long does it
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The time it takes the plane to change its velocity is 9s.

<h3>What is time?</h3>

Time can be defined the measured or measurable period during which an action, process, or condition exists or continues.

To calculate the time it takes the airplane to change its velocity, we use the formula below.

Formula:

  • t = (v-u)/a.......... Equation 1

Where:

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  • u = Initial velocity
  • t = time

From the question,

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Substitute these values into equation  1

  • t = (40-22)/2
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Hence, the time it takes the plane to change its velocity is 9s.

Learn more about time here: brainly.com/question/2854969

4 0
1 year ago
How high up is a 5kg object that has 300j of energy
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