A friend of yours is loudly singing a single note at 410 hz, Ask an Expert

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Q. A friend of yours is loudly singing a single note at 410 Hz while racing toward you at 26.1 m/s on a day when the speed of sound is 339 m/s. What frequency does your friend hear if you suddenly start singing at 410 Hz?

Q. A uniform electric field E = 2800 V/m exists within a certain region. What volume of space contains an energy equal to 1.05 multiplied by 10-7 J? Express your answer in cubic meters and in liters.

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