1. Determine the force P needed to move block B up. The coefficient of static friction be- tween A and C and between B and D is, μs = 0.2, and between A and B, μ's = 0.1. Neglect the weight of each wedge. P 154 A 3000 lb B

The beam AD is loaded as shown. The coefficients of static friction at the wedge's top and bottom surfaces are µca = 0.25 and µcB = 0.35, respectively. Neglect the weight and size of the wedge and the thickness of the beam. Determine the horizontal force P which must be applied to the wedge in order to remove it from under the beam. 4 kN/m 10° D B 3 m 4 m

A simply supported beam is subjected to a triangularly distributed load of Q = 7.6 kN/m, over segment length L/2 = 3.7 m and a mid-span moment of MO=7.6 kN-m. Determine the maximum slope and deflection of the beam. Assume El is constant. A QkN/m 1/12 - Mo B 7/2 6 C

Determine the force P required to force the 11° wedge under the 95-kg uniform crate which rests against the small stop at A. The coefficient of friction for all surfaces is 0.39. 8° Answer: P = 11° i 1.8 m 95 kg 0.6 m A 11° N

13 kN B Block A supports a pipe column and rests as shown on wedge B. Knowing that the coefficient of static friction at all surfaces of contact is 0.25 and that 0=45°, determine the smallest force P for which equilibrium is maintained.

5. Blocks A, B, and C have weights of 50 N, 25 N, and 15 N, respectively. Determine the smallest horizontal force P that will cause impending motion. The coefficient of static friction between A and B is 0.3, between B and C is 0.4, and between block C and the ground is 0.35. : P=45 N→ 52

k=2 lb/ft -¨¨¨¨¨ B Two blocks A and B have a weight of 11 lb and 6 lb, respectively. They are resting on the incline for which the coefficients of static friction are μA = 0.16 and μB = 0.23. Determine the angle 0 which will cause motion of one of the blocks. What is the friction force under each of the blocks when this occurs? The spring has a stiffness of k = 2 lb/ft and is originally unstretched. Determine the smallest angle which will cause motion of one of the blocks. Determine is the friction force under the block A at this angle. Determine is the friction force under the block Bat this angle.