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Mathematics
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OpenStudy (anonymous):
Help please! A trumpeter is placed on a moving sidewalk that moves at a constant velocity of 4.5 m/s. A listener is standing 6.0 m in front of the trumpeter on the same sidewalk. The trumpeter plays a note of frequency 290 Hz. The air is still and the speed of sound is 340m/s. What frequency of the note does the listener hear?
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