﻿ A piano wire of length 1.2m and area of cross section 4 x 10–7 m2 is under tension of 80N. Find the extension in the wire and potential energy stored in the wire. The Young s modulus of the material of wire is 2.1x1011N/m2. from Physics Mechanical Properties of Solids Class 11 Manipur Board

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Mechanical Properties of Solids

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A piano wire of length 1.2m and area of cross section 4 x 10–7 m2 is under tension of 80N. Find the extension in the wire and potential energy stored in the wire. The Young's modulus of the material of wire is 2.1x1011N/m2.

Length of the wire, l = 1.2 m
Area of cross-section, A = 4 x 10–7 m2
Tension, T = 80 N
Young's modulus of the wire, Y = 2.1 $×$ 1011 N/m

Now, using the formula,

Young's modulus is given by

Extension in the piano wire is given by,

Potential Energy stored in the wire is,

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