The block of weight W is being pulled up the inclined
Chapter 8, Problem 8-51(choose chapter or problem)
The block of weight W is being pulled up the inclined plane of slope \(\alpha\) using a force P. If P acts at the angle \(\phi\) as shown, show that for slipping to occur, \(P = W\ \sin(\alpha + \theta)\ /\ \cos(\phi - \theta)\), where \(\theta\) is the angle of friction; \(\theta = \tan^{-1}\ \mu\).
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