A Piano Wire Has a Radius of 0

question 10

Multiple Choice

A piano wire has a radius of 0.50 mm.One end is fixed and the other is wrapped around a tuning peg,which has a diameter of 3.5 mm and is 80 cm away.After the wire just becomes taut,the peg is given three full turns.What is the tension in the wire? Young's modulus for steel is 2.0 × 10¹¹ N/m².

• A)3.8 kN
• B)4.3 kN
• C)6.5 kN
• D)8.7 kN
• E)9.8 kN

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Definitions:

Commercially Impracticable

A condition under the Uniform Commercial Code where performance of a contract is made excessively burdensome or expensive due to unforeseen events.

Supervening Event

An event that occurs after the parties have entered into a contract and significantly changes the circumstances, possibly excusing performance.

Additional Labor

Extra workforce employed to meet increased demand or to complete a specific project or task.

Material Breach

A significant failure to perform under a contract which permits the other party to either demand performance or terminate the agreement.