4-49. Determine the angle o at which the applied force P should act on the pipe so that the magnitude of P is as small as possible for pulling the pipe up the incline. What is the corresponding value of P? The pipe weighs W and the slope a is known. Express the answer in terms of the angle of kinetic friction, = tan H-

3-18. If the spring DB has an unstretched length of 2 m, determine the stiffness of the spring to hold the 40-kg crate in the position shown. 3-19. Determine the unstretched length of DB to hold the 40-kg crate in the position shown. Take k = 180 N/m. %3D -2 m- 3 m В 2 m www A

Determine the internal normal force at point F in the frame. The crate weighs 151 lb. 4 ft 1.5 ft 1.5 ft 1.5 ft 1.5 ft O B F C E D 0.4 ft

4-47. The Y0-kg man climbs up the ladder and stops at the position shown after he senses that the ladder is on the verge of slipping. Determine the coefficient of static friction between the friction pad at A and ground if the inclination of the ladder is e = 60° and the wall at B is smooth. The center of gravity for the man is at G. Neglect the weight of the ladder. 3m Foo

The chain binder is used to secure loads of logs, lumber, pipe, and the like. If the tension T1 is 2.2 kN when θ = 38°, determine the force P required on the lever and the corresponding tension T2 for this position. Assume that the surface under A is perfectly smooth.Assume a = 120 mm, b = 510 mm.

P5-3. then draw the free-body diagrams of each member of the identify any two-force members, and frame. 2 m 400 N в 0.2 m 1.5 m

3-38 with the following modification change the block weight to 50 lb

The 185-lb man with center of gravity G supports the 83-lb drum as shown. Find the greatest distance x at which the man can position himself without slipping if the coefficient of static friction between his shoes and the ground is 0.43. 15' 83 lb Answer: x = tel ft T 3.3'

The uniform box shown in next figure, has a mass of 40 Kg. If the two forces T = 60 N and F -30 N are applied on the box, determine if it remains in equilibrium. The coefficient of static friction (u) = 0.24 T-60N 30 40 Kg 45 F=30N

The frame supports the 400 kg mass as shown. Assume a coefficient of friction of 0.25 around the pulley. Further assume the frictional forces are fully developed. Determine all external reactions and all pin reactions acting on the structure. pleas show me all your work