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OpenStudy (mewmew):
Two trains moving along parallel tracks in opposite directions converge on a stationary observer, each sounding its whistle of frequency 350 Hz. One train is traveling at 50 mph. What must be the speed of the other if the observer hears 5 beats per second (difference in audible frequency between two whistles).
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OpenStudy (anonymous):
Do you know the doppler equation?
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