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Juli2301 [7.4K]
3 years ago
15

The US Environmental Protection Agency issues a daily report for pollution levels called the __________.

Physics
2 answers:
VARVARA [1.3K]3 years ago
5 0
I think it’s D lol i’m not sure
kipiarov [429]3 years ago
4 0

Answer:D

Explanation:

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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
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Answer:

-3.396 m/s or 3.465 m/s

Explanation:

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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'

f=f'\dfrac{v}{v+v_s}\\\Rightarrow 0.99f'=f'\dfrac{v}{v+v_s}\\\Rightarrow 0.99=\dfrac{343}{343+v_s}\\\Rightarrow v_s=\dfrac{343}{0.99}-343\\\Rightarrow v_s=3.46464646465\ m/s

The velocity is 3.465 m/s

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A

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