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Dominik [7]
3 years ago
7

Kenneth observes that as an ambulance approaches him, the pitch of the sound of the siren is higher, and the pitch decreases whe

n the ambulance moves away from him. Which of the
following is the possible scientific reason for the situation?
A The wavelength of the sound wave gets shorter, and hence the pitch gets higher
B. The wavelength of the sound wave gets longer, and hence the pitch gets higher
C. The wavelength of the sound wave does not affect the pitch
D. The wavelength of the sound wave changes the speed of the wave
Physics
1 answer:
alexgriva [62]3 years ago
3 0

Answer: A.

Explanation:

Since pitch and frequency are the same thing when frequency is higher the wavelength decreases and A is the only valid answer.

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Explanation:

Since the angle of the refracted ray moves away from the normal, it must be traveling in a faster medium.

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Answer:

(A) 7.9 m/s^{2}  

(B) 19 m/s

(C) 91 m

Explanation:

initial velocity (U) = 0 mph = 0 m/s

final velocity (V) = 85 mph = 85 x 0.447 = 38 m/s

initial time (ti) = 0 s

final time (t) = 4.8 s

(A) acceleration = \frac{V-U}{t}

         = \frac{38-0}{4.8} = 7.9 m/s^{2}  

(B) average velocity = \frac{V+U}{2}

     =\frac{38+0}{2} = 19 m/s

(C) distance travelled (S) = ut + 0.5at^{2}

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Explanation:

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Thermal energy is the _____ of the kinetic and potential energies of all particles in an object.
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A mouse is running across a room with a speed of 2.2 m/s. The mass of the mouse is 1.4 kg. What is the Kinetic Energy of the mou
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Answer:

<h2>3.39 J</h2>

Explanation:

The kinetic energy of an object can be found by using the formula

k =  \frac{1}{2} m {v}^{2}  \\

m is the mass

v is the velocity

From the question we have

k =  \frac{1}{2}  \times 1.4 \times  {2.2}^{2}  \\  = 0.7 \times 4.84 \\  = 3.388 \:  \:  \:  \:  \:  \:  \:  \:  \:

We have the final answer as

<h3>3.39 J</h3>

Hope this helps you

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