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Q. Two speakers, one directly behind the other, are each generating a 152-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 344 m/s.

Q. A small hoist can raise 105 kg of bricks to the top of a construction project 40 m above the street in half a minute. Determine the power provided.

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