A noisy machine in a factory produces sound by a level of
A noisy machine in a factory produces sound by a level of 80 dB. How many identical machines could you add to the factory without exceeding the 90 dB limit?
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at rest a cars horn sounds the note a 440 hz the horn is sounded while the car is moving down the street a bicyclist
a noisy machine in a factory produces sound by a level of 80 dbnbsp how many identical machines could you add to the
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