Question

A 100 kg nonuniform boom, 6.0 m long, is loosely pinned at the pivot at P. A 700 kg block is suspended from the end of the boom at A. The boom forms a 30 degree angle with the horizontal, and is supported by a cable, 4.0 m long, between points D and B. Point B is 4.0 m from P, and point D is 4.0 m above P. The center of mass of the boom is at point C, which is 2.0 m from P. In Figure 10.14, the y-component of the pivot force on the boom at P is A 40 kg uniform ladder, 5.0 m long, is placed against a smooth wall at a height of h = 4.0 m. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction is 0.40. An 80 kg block is suspended from the top rung of the ladder, just at the wall. In Figure 10.12, the force exerted on the wall by the ladder is closest to:

Answer 1

Answer 2

Answer 3

Question 1:

y-component at P = 300 kgf (downwards)

Question 2: