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1) A pedestrian waiting for the light to change at an intersection hears a car approaching...

1) A pedestrian waiting for the light to change at an intersection hears a car approaching with its horn blaring. The car's horn produces sound with a frequency of 381 Hz, but the pedestrian hears a frequency of 389 Hz. How fast is the car moving?

2) A train moving with a speed of 31.3 m/s sounds a 151 Hz horn. What frequency is heard by an observer standing near the tracks as the train approaches?

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