Solving the A-String Puzzle: Calculating Mass from Length and Tension

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cumminatyou93
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Homework Statement



The A-string (440Hz ) on a piano is 38.9cm long and is clamped tightly at both ends. If the string is under 667-N tension, what is its mass?

I can't figure out which equations to use. Anybody know?
 
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The fundamental frequency of a vibrating string.
 

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