(Solved):   The triangular plate is fixed at its base, and its apex \( A \) is given a horizontal disp ...

 

The triangular plate is fixed at its base, and its apex \( A \) is given a horizontal displacement of \( 5 \mathrm{~mm} \). Suppose that \( a=720 \mathrm{~mm} \). (Figure 1) Determine the average normal strain \( \epsilon_{x} \) along the \( x \) axis. Express your answer using three significant figures. Figure