A length of piano wire is used to hang a mass from the ceiling. If the total mass of the string is 0.

A length of piano wire is used to hang a mass from the ceiling.  If the total mass of the string is 0.72 g and the mass hung from it is 1850 g, what is the length of the wire, assuming the fundamental frequency when plucked in these circumstances is 1280 Hz? 

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