*8-60. Each block has a weight of 400 lb. Determine how far the force P can compress the spring until block B slips on block A. What is P for this to occur? Problem 8-60 k = 800 lb/ft ww W μ's = 0.5 A B Ms = 0.2 μs P 30°

The uniform 45 kg slender rod is at rest in the position shown when P = 525 N is applied. What is the total work done U1-2 when the rod goes to vertical position? Take L1 = 3.75 m and L2 = | 4.75 m. L2 L1 B

Under the man's pushing force P = 37.3 lb, the uniform cabinet is sliding on the ground with a constant acceleration of a. If the uniform cabinet has weight of 150 lb, and the coefficient of kinetic friction between the cabinet and the ground is uk = 0.14, determine the normal force reaction under leg A. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point and proper unit. Take g = 32.2 ft/s2. -1 ft→+–1 ft-→| P 4 ft 3.5 ft A В Your Answer: Answer units

*8-4. The winch on the truck is used to hoist the garbage bin onto the bed of the truck. If the loaded bin has a weight of 8500 lb and center of gravity at G, determine the force in the cable needed to begin the lift. The coefficients of static friction at A and B are μà = 0.3 and µ = 0.2, respectively. Neglect the height of the support at A. Prob. 8-4 G A 10 ft 12 ft B 30°

5-46. Three uniform books, each having a weight W and length a, are stacked as shown. Determine the maximum distance d that the top book can extend out from the bottom one so the stack does not topple over. Problem 5-46 a

The uniform bar has a mass m and length l. If it is released from rest when u = 0°, determine the angle u at which it first begins to slip. The coefficient of static friction at O is ms = 0.3.

Problem 14-70 Determine the smallest amount the spring at B must be compressed against the block ofmass M so that when it is released from B it slides along the smooth surface and reachespoint A. Given: M = 0.5kg b = 1 m k = 2000 en = 9.81-

F14–7. If the contact surface between the 20-kg block and the ground is smooth, determine the power of force F when 1 = 4 s. Initially, the block is at rest. F = 30 N

8-86. A force of P= 25 N is just sufficient to prevent the 20-kg cylinder from descending. Determine the required force P to begin lifting the cylinder. The rope passes over a rough peg with two and half turns. I=

The 553-N force is applied to the 96-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. H = 0.71 = 0.51 Answer: F = i 35° N P = = 553 N