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Example 4: Young’s s modulus<br />
for brass is 8.96 x 10 11 Pa. . A<br />
1<strong>20</strong>-N weight is attached to an<br />
8-m length of brass wire; find<br />
the increase in length. The<br />
diameter is 1.5 mm.<br />
First find area of wire:<br />
8 m<br />
L<br />
1<strong>20</strong> N<br />
2 2<br />
D (0.0015 m)<br />
A <br />
A = 1.77 x 10 -6 m 2<br />
4 4<br />
FL FL<br />
Y or L<br />
AL<br />
AY
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