Friday
April 18, 2014

Homework Help: Physics

Posted by Emily on Friday, December 7, 2012 at 11:58pm.

A person standing close to a railroad crossing hears the whistle of an approaching train. He notes that the pitch of the whistle drops as the train passes by and moves away from the crossing. The frequency of the distant approaching whistle is 540 Hz; it drops to 470 Hz after the train is well past the crossing. What is the speed of the train? Use 340 m/s for the speed of sound in air.

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