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A piano wire with mass 3.35 grams and a length of 78.0cm is stretched with a...

A piano wire with mass 3.35 grams and a length of 78.0cm is stretched with a tension of 28.0N. A wave with a frequency 120Hz and an amplitude 1.60 mm travels along the wire. Calculate the power carried by the wave? What happens to the average power if the waves amplitude is halved?

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