2 years ago

PLEASEEE HELPPPPP does anyone know these answers?

Physics

1 answer:

steposvetlana [31]2 years ago

5 0

Answer:

oof ok

Explanation:

Thank you :)

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Two trains are traveling on the same track and in the same direction. The first train, which is behind the second train, blows a

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Answer:

37.545 m/s

Explanation:

f' = Actual frequency of horn = 269 Hz

f = Observed frequency of horn = 290 Hz

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

$v_0$ = Speed of second train = 13.7 m/s

$v_s$ = Speed of first train

From Doppler effect we have

$f=f'\dfrac{v-v_0}{v-v_s}\\\Rightarrow v_s=v-\dfrac{f'}{f}(v-v_0)\\\Rightarrow v_s=343-\dfrac{269}{290}(343-13.7)\\\Rightarrow v_s=37.545\ m/s$

The speed of the first train is 37.545 m/s

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Answer:

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