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k0ka [10]
3 years ago
12

A train moving at a constant speed is passing a stationary observer on a platform. On one of the train cars, a flute player is c

ontinually playing the note known as concert A (f = 440 Hz). After the flute has passed, the observer hears the sound with a frequency of 415 Hz. What is the speed of the train? The speed of sound in air is 343 m/s.
Physics
1 answer:
Ilya [14]3 years ago
8 0

Answer:

Explanation:

We shall apply the formula of Doppler effect here

F( APPARENT) = F( REAL ) X V/(V + Vs) [ v is velocity of sound and Vs is velocity of source.

415 = 440 X 343/343+Vs

142345 + 415Vs = 150920

415 V₀ = 8575

V₀ = 20.66 m/s.

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Now this should be same with the potential energy which is given as;

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=> 1793.69m = h

h= 1793.69m

h =1793.7m to 1 decimal place

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