Problem 531 | Friction
Problem 531
A uniform plank of weight W and total length 2L is placed as shown in Fig. P-531 with its ends in contact with the inclined planes. The angle of friction is 15°. Determine the maximum value of the angle α at which slipping impends.
![Plank resting at some angle on two inclined planes](http://www.mathalino.com/sites/default/files/images/531-plank-angle-inclined-planes.gif)
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