Two 8° wedges of negligible weight are used to move and position and block position a 530-Ib block Knowing that the coefficient of static friction is 0.40 at all surfaces of contact, determine the magnitude of the force P for which motion of the block is impending.
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Free body diagram for block:
Coefficient of static friction,
From equilibrium equations
So, by solving (1) and (2) we get
Free body diagram for wedge:
From equilibrium equation
The magnitude of force is