The 25-kg plate ABCD is attached at A and D to collars which can slide on the

Question:

The 25-kg plate ABCD is attached at A and D to collars which can slide on the vertical rod. Knowing that the coefficient of static friction is 0.40 between both collars and the rod, determine whether the plate is in equilibrium in the position shown when the magnitude of the vertical force applied at E is

(a) P = 0,

(b) P = 80 N.

1.75 m 1.75 1 0.70 m m,