Plan the Solution  
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The figure shows a vertical bar of width 50 millimeters. An inclined section labeled a a is shown making an angle 36 degrees with the vertical. The load at the bottom end of the bar is directed vertically downwards.

Several approaches could be used to determine the maximum load P. For this example, the following procedure will be used:

3. Using the area Aa-a and the allowable normal stress, the corresponding normal force N acting on surface a-a can be computed.

4. Using the angle θ, the maximum load P corresponding to this normal force N can be computed.