F4-14. Determine the minimum force P to prevent the 30-kg rod AB from sliding. The contact surface at B is smooth, whereas the coefficient of static friction between the rod and the wall at A is u, = 0.2. 3m -4 m
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- The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.The two uniform sheets of plywood, each of length L and weight W, are propped as shown. If the coefficient of static friction is 0.5 at all three contact surfaces, determine whether the sheets will remain at rest.The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.
- The three bars have a weight of WA = 20 lb, WB =40 lb, and WC = 60 lb, respectively. If the coefficientsof static friction at the surfaces of contact are asshown, determine the smallest horizontal force Pneeded to move block A.The coefficient of static friction between wedgesB and C is μs = 0.6 and between the surfaces ofcontact B and A and C and D, μs = 0.4. If P = 50N,determine the smallest allowable compression ofthe spring without causing wedge C to move tothe left. Neglect the mass of the wedges.F4-19. 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 u, = 0.3, between B and C, 4 = 0.4, and between block C and the ground, p" = 0.35.
- The uniform 20-lb ladder rests on the rough floor forwhich the coefficient of static friction is s = 0.45 andagainst the smooth wall at B. Determine the horizontalforce P the man must exert on the ladder in order tocause it to move.P =The 5000-N concrete block is adjusted its positionusing a 5° wedge under the action of force F. If thecoefficient of static friction between all contacts is0.3, determine the least force F required to movethe block.F =The drum has a weight of 100 lb and rests on the floor for wich the coefficient of static friction is Ms = 0.5 If a = 3 ft and b = 4 ft, determine the smallest magnitude od the force P that will cause impending motion of the drum.3. The uniform 20-lb ladder rests on the rough floor forwhich the coefficient of static friction is s = 0.45 andagainst the smooth wall at B. Determine the horizontalforce P the man must exert on the ladder in order tocause it to move. 4. The 5000-N concrete block is adjusted its positionusing a 5° wedge under the action of force F. If thecoefficient of static friction between all contacts is0.3, determine the least force F required to movethe block.
- R4-7. The uniform 20-kg ladder rests on the rough floor for which the coefficient of static friction is u, - 0.4 and against the smooth wall at B. Determine the horizontal force P the man must exert on the ladder in order to cause it to move. 25 m 4 m 2.5 mF4-18. Determine the minimum coefficient of static friction between the uniform 50-kg spool and the wall so that the spool does not slip. B. 0.6 m- 03 mThe 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