A popular car stereo has four speakers, each rated at 60 {\ m W}. In answering t

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A popular car stereo has four speakers, each rated at 60 { m W}. In answering the following questions, assume that the speakers produce sound at their maximum power. The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10^{-12}; m W/m^2. Find the distance d from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 { m W} of sound, as suggested in the last follow-up commen

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