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forsale [732]
4 years ago
11

An ambulance drives by with a blaring siren.

Physics
2 answers:
sergejj [24]4 years ago
6 0
<h3><u>Answer;</u></h3>

Doppler effect

<h3><u>Explanation</u>;</h3>
  • <em><u>The pitch of the siren of a Fire truck appears to change as the truck passes us due to the Doppler effect.</u></em>
  • <em><u>Doppler effect is the tendency to increase or decrease the wavelength of the sound due to the motion of the source. </u></em>
  • Therefore; when the ambulance is approaching ab observer, the wavelength is decreased and the pitch of the sound also increases as compared to when the ambulance is at rest.
  • When the ambulance passes and is moving away from an observer, the wavelength is increased and the pitch is decreased below the value when the source is at rest.
dimaraw [331]4 years ago
6 0

Answer:

Doppler effect

Explanation:

Doppler effect :

In simple meaning Doppler effect is an adjustment in frequency and wavelength of a wave. It is brought about by the adjustment in separation between the thing making the wave (causer) and anything that is estimating seeing or hearing the wave.

According to this effect the pitch of the wave changes distance is changes

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A thermal hazard symbol means your should wear protective clothing so that you do not get burned. True False
Ivan
True. If something is thermal, that means that by getting to close to it, you could get burned.
3 0
3 years ago
What is the kinetic energy of a 1,350kg car traveling at a speed of 12m/s?
Ainat [17]
Kinetic energy= 1/2 m v^2

so... 1/2(1350)(12^2)

kinetic energy = 97200Joules
7 0
3 years ago
A car starting from rest has a constant acceleration of 4 meters per second per second. How fast will it be going in 5 seconds?
irinina [24]

Answer:

18 m

Explanation:

Given : vo = 0 m/s ; t = 3 s; a = 4 m/s^2 ; d = ? m ; average velocity = ? m/s ; fonal velocity = ? m/s

solving for the final velocity, v

v = a * t

v = 4 m/s^2 * 3 s

v = 12 m / s

Solving for the average velocity. avg v

avg v = (vo + v) / 2

avg v = (0 m / s + 12 m/s) / 2

avg v = 6 m / s

Solving for the distance traveled after 3 s

d = avg v * t

d = 6 m / s * 3 s

d = 18 meters

In the first 3s the car travels 18 meters.

4 0
3 years ago
Your friend turns the volume up on their speaker system, so that the sound intensity is 4 times greater than it was beforehand.
erica [24]

Answer:

4

Explanation:

We know that intensity I = P/A where P = power and A = area through which the power passes through.

Now, let the initial intensity of the speaker be I₀ and its initial power be P₀. Since the intensity is increased by a factor of 4, the new intensity be I and new power be P.

So, I = P/A and I₀ = P₀/A

Now, if I = 4I₀,

P/A = 4P₀/A

P = 4P₀

Now, energy E = Pt, where t = time. So, P = E/t and P₀ = E₀/t

Substituting P and P₀ into the equation, we have

P = 4P₀

E/t = 4E₀/t

E = 4E₀

Since the energy is four times the initial energy, the energy output increases by a factor of 4.

4 0
3 years ago
Which statement best defines an electric field?
stich3 [128]

Answer:

D

Explanation:

3 0
2 years ago
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