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===== Homework for Waves =====

(From $Vibrations$ & $Waves$, I.G. Main problem 9.11)  Show that the average power carried along a stretched string by a sinusoidal traveling wave is ${{P}_{av}}=\frac{1}{2}{{Z}_{0}}{{\omega }^{2}}{{A}^{2}}$, where the symbols have their usual meanings

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