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Two train engines are moving in opposite directions down a close pair of parallel tracks. Train...

Two train engines are moving in opposite directions down a close pair of parallel tracks. Train 1 is heading south at 15.0 m/s and Train 2 is heading north at 20.0 m/s. The engineer on Train 2 sounds a whistle with frequency 440 Hz to let the engineer on Train 1 know that he is approaching. The air temperature is 15°C.

Find the speed of sound in air at 15°C.

Sketch the scenario, and determine the frequency with which the engineer on Train 1 hears the whistle.

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