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sergey [27]
3 years ago
5

A child sits on a dock and notices that 8 wavelengths pass the end of the dock in 4 seconds. What is the

Physics
1 answer:
jeyben [28]3 years ago
6 0
The frequency of the waves are 0,5
This is because the frequency of the wave is calculated by dividing the speed by the wavelength.
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elaborate on the difference between a chemical change and a physical change. a) a physical change is irreversible where as a che
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I think the correct answer from the choices listed above is option D. The difference between a chemical change and a physical change is lies in the fact that a physical change does not break any bonds while a chemical change does form new substances. Hope this answers the question.
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4 years ago
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You carry a 20 N bag of dog food up a 6.0 m flight of stairs. How much work was done?
MariettaO [177]
Answer:
120 J

Explanation:


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Work= 20 N x 6.0

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2 years ago
Please , physics. A and B
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Answer:

a. -5,4

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(see how to solve in pic)

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3 years ago
Singing that is off-pitch by more than about 1% sounds bad. How fast would a singer have to be moving relative to the rest of a
Nina [5.8K]

Answer:

-3.396 m/s or 3.465 m/s

Explanation:

v = Speed of sound in air = 343 m/s

v_s = Relative speed of the singer

f = Observed frequency

f' = Actual frequency

1% change can mean f=1.01f'

From the Doppler effect equation we have

f=f'\dfrac{v}{v+v_s}\\\Rightarrow 1.01f'=f'\dfrac{v}{v+v_s}\\\Rightarrow 1.01=\dfrac{343}{343+v_s}\\\Rightarrow v_s=\dfrac{343}{1.01}-343\\\Rightarrow v_s=-3.396\ m/s

The velocity is -3.396 m/s

when f=0.99f'

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The velocity is 3.465 m/s

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