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One end of a piano wire is wrapped aroun...

One end of a piano wire is wrapped around a cylindrical tuing peg and the other end is fixed in place. The tuning peg is turned so as to stretch the wire. The piano wire is made from steel `(Y=2.0xx10^(11)N//m^(2))`. It has a radius of 0.80 mm, and an unstrained length of 0.76 m. The radius of the tuning peg is 1.8 mm. Initially, there is not tension in the wire. Find the tension in the wire when the tuning peg its turned through two revolutions.

A

15,000 N

B

12,000 N

C

9200 N

D

6100 N

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The correct Answer is:
B
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