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Example 1. A steel wire 10 m long and<br />
2 mm in diameter is attached to the<br />
ceiling and a <strong>20</strong>0-N weight is attached<br />
to the end. What is the applied stress?<br />
L<br />
L<br />
A<br />
A<br />
F<br />
First find area of wire:<br />
2 2<br />
D (0.002 m)<br />
A <br />
<br />
<br />
4 4<br />
A = 3.14 x 10 -6 m 2<br />
Stress<br />
<br />
F<br />
A<br />
<br />
<strong>20</strong>0 N<br />
3.14 x 10 m<br />
-6 2<br />
Stress<br />
6.37 x 10 7 Pa
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