The applied force $P$ causes the rigid arm ABC to rotate clockwise about pin A through an angle of $0\mathrm{.}07.$

$($Figure $1)$

Part B

Determine the normal strain in wire $CE.$

Express your answer in millimeters per millimeter to three significant figures.

Figure

$1$ of $1$

${}_{CE}=$

$$

$m\frac{m}{m}m$

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