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e-lub [12.9K]
3 years ago
15

A police car moving at 36.0 m/s is chasing a speeding motorist traveling at 30.0 m/s. The police car has a siren that emits soun

d at 3550 Hz. What is the frequency that the motorist hears?
Physics
1 answer:
maxonik [38]3 years ago
5 0

Answer:

The frequency heard by the motorist is 4313.2 Hz.

Explanation:

let f1 be the frequency emited by the police car and f2 be the frequency heard by the motorist, let v1 be the speed of the police car and v2 be the speed of the motorist and v = 343 m/s be the speed of sound.

because the police car is moving towards the motorist at a higher speed, then the motorist will hear a increasing frequency and according to Dopper effect, that frequency is given by:

f1 =  [(v + v2/(v - v1))]×(f2)

   = [( 343 + 30)/(343 - 36)]×(3550)

   = 4313.2 Hz

Therefore, the frequency heard by the motorist is 4313.2 Hz.

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When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated o
steposvetlana [31]

Answer: True

Explanation:

It should be noted that when refrigerant is added in vapor form to the operating refrigeration system, then the addition of the refrigerant should be to the low-pressure side of the refrigeration system.

Furthermore, when system pressures are lower than the pressure in the refrigerant tank as stated in the question, then the refrigerant can be added to both the high and low pressure sides of the system.

Therefore, the correct option is true.

5 0
3 years ago
Suppose you are sitting in the passenger seat of a parked car. You hear sounds coming from the stereo of another car parked on t
ch4aika [34]

This happen because of what is called Doppler effect and it occur you who is the receiver of the sound waves is in motion and the source of the wave is stagnant.

<h3>What is sound waves?</h3>

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6 0
2 years ago
List between six and eight student organizations either offered by your school or offered
melamori03 [73]

Examples of student-led organizations are:

  • Academic and educational organizations

  • Community service organization

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  • Student government organizations

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The benefits of getting involved in any of these are many. They include but are not limited to:

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8 0
2 years ago
Another coin is thrown up into the air and hit the ground after 6s with a velocity of -60 m/s after experiencing an acceleration
Grace [21]

Answer:

Vf = Vi + a t       fundamental equation

-60 m/s= Vi - 9.8 m/s^2 * 6 sec      taking upward direction as positive

Vi =58.8 m/s - 60  m/s = -1.2 m/s   so the coin was initially thrown downward

As a check take the downward direction as positive

Vf = 1.2 m/s + 58.8 m/s = 60 m/s  

7 0
3 years ago
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