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A steel piano wire (Y = 200 GPa) has a diameter of 0.780 mm. At one...

A steel piano wire (Y = 200 GPa) has a diameter of 0.780 mm. At one end it is wrapped around a tuning pin of diameter 8.00 mm. The length of the wire (not including the wire wrapped around the tuning pin) is 66.0 cm. Initially, the tension in the wire is 379 N. To tune the wire, the tension must be increased to 407 N. Through what angle must the tuning pin be turned?

(θ = answer°)

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