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cyspope
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Homework Statement
A train approaches an observer at 35.0 m/s and passes a person stading on the side of the track. The whistile is sounding at 2.5 kHz. What frequency will the person hear as the train approaches? When it recedes?
Homework Equations
f' = f [tex]\frac{v \pm vo}{v \mp vs}[/tex]
The Attempt at a Solution
f' = 2500 Hz(?)
I don't know what number I should put into the equation.