First slide

Elastic Modulie

Question

A wire ( Y = 2 x 10¹¹ N/m² ) has length I m and area 1 mm² ; the work required to increase its length by 2 mm is:

Moderate

A

0.4 J
B

40 J
C

4 J
D

400 J

Solution

$W = \frac{AY}{2 L} {(∆ l)}^{2}$

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