A car is parked 19.0 m directly south of a railroad crossing. A train is approac

Question

A car is parked 19.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, heading directly east at a speed of 57.0 m/s. The train sounds a short blast of its 275-Hz horn when it reaches a point 15.0 m west of the crossing. What frequency does the cars driver hear when the horn blast reaches the car? The speed of sound in air is 343 m/s. (Hint: Assume that only the component of the trains velocity that is directed towards the car affects the frequency heard by the driver.)

Explanation / Answer

f = V*fo/(V-Vt*cos45)

f = (343*275)/(343-(57*cos45))

f = 311.62 Hz

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