Biology, 16.10.2020 04:01 Homepage10
While standing near a railroad crossing, a person hears a distant train horn. According to the train's engineer, the frequency emitted by the horn is 440 Hz. The train is traveling at 20.0 m/s and the speed of sound is 346 m/s.
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Gram-negative bacteria have a cell wall that is! and does not accept the stain, making itappear
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While standing near a railroad crossing, a person hears a distant train horn. According to the train...
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