Chapter 8, Problem 44P

Block A has a mass of 29 kg and block B has a mass of 41 kg. The two blocks are stacked on the ramp with an incline of 0 = 32.2°. Determine the largest horizontal force F that can be applied to block B without either block moving for each of the following two cases: a.) The friction coefficient for the contact between blocks A and B is Hs1 = 0.6 and the friction coefficient for the contact between block A and the ramp is Hs2 = 0.22. b.) The friction coefficient for the contact between blocks A and B is µs1 = 0.6 and the friction coefficient for the contact between block A and the ramp is Hs2 = 0.55. F A Part a) The limiting slip condition occurs at the contact between A and the ramp v The maximum force before either block A or B slips is N Part b) The limiting slip condition occurs at the contact between A and B The maximum force before either block A or B slips is >

The man is trying to push the homogeneous 20-kg ladder AB up a wall by applying the horizontal force P. Determine the smallest value of Pthat would move the ladder. The coefficient of static friction between the ladder and both contact surfaces is 0.3. 1.5 m 2 m Note that h = 5 m

A 182 lb man climbs up the ladder and stops at the position shown when he senses the ladder is on the verge of slipping. Determine the coefficient of static friction between the ladder and the ground at A if the angle theta is 60 degrees. The ladder has a negligible weight and the wall at B is smooth. 3 ft- G 10 ft A

The 180-lb tree surgeon lowers himself with the rope over a horizontal limb of the tree. If the coefficient of friction between the rope and the limb is 0.60, compute the magnitude of the force applied to the rope by the tree surgeon's hands to let himself down slowly. Express your answer in units of lb.

The 100-lb boy at A is suspended from the rope that passes over the quarter circular cliff rock. Determine if it is possible for the 185-lb woman to hoist him up; and if this is possible, what smallest force must she exert on the rope? The coefficient of static friction between the rope and the rock is μ = 0.2, and between the shoes of the woman and the ground μ' = 0.8.

Two blocks, A and B have masses of 10 kg and 20 kg. The coefficient of static friction between A and B is 0.20, between B and C is 0.10 and at D, 0.15. Block B impends to slide up the 30o inclined plane. Illustrate the free body diagram of block A Illustrate the free body diagram of block B What is the weight of the hanging block that will maintain static equilibrium? Note: Use T1 and T2 for tension on the tight side and slack side of the cord respectively.

Determine the Tension in the cable for the 250N block A not to slide down in the inclined plane. Given that the coefficient of static friction in the 45° inclined plane is 0.25 and in the 30° inclined plane is 0.3. (Assume frictionless pulley) Determine the tension on the cable for the 250N block A not to slide up in the inclined plane. Given that the coefficient of static friction in the 45° inclined plane is 0.25 and in the 30° inclined plane is 0.3. (Assume frictionless pulley)

A 1500-lbs crate is pulled along the ground with a constant speed for a distance of 25 ft, using a cable that makes an angle of 15° with the horizontal. Show free body diagram and determine the tension in the cable.The coefficient of kinetic friction between the ground and the crate is μk = 0.55.

The 150 lb block rests on an inclined surfacevand is attached to a frictionless pulley C. The coefficient of static friction between the block and the incline is 0.25. The dope passes over a drum D, where the coefficient of static friction between the rope and the drum is 0.2, as shown. Find the minimum and maximum values for the weight of block B, Wb, for which no motion will occur. Neglect tipping.