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- The light bar is used to support the 50-kg block in its vertical guides. If the coefficient of static friction is 0.30 at the upper end of the bar and 0.40 at the lower end of the bar, find the friction force acting at each end for x = 75 mm. Also find the maximum value of x for which the bar will not slip 50 kg A 300 mmThe coefficient of static friction between the drum 300 mm -700 mm and brake bar is H = 0-4. If the moment -125 mm M = 35 N-m, determine the smallest force P that S00 mm needs to be applied to the brake bar in order to prevent the drum from rotating. Also determine the corresponding horizontal and vertical components of reaction at pin 0. Neglect the weight and thickness of the brake bar. The drum has a mass of 25Kg.6 of 8 *8-44. The 3-Mg rear-wheel-drive skid loader has a center of mass at G. Determine the largest number of crates that can be pushed by the loader if each crate has a mass of 500 kg. The coefficient of static friction between a crate and the ground is Hy = 0.3, and the coefficient of static friction between the rear wheels of the loader and the ground is u = 0.5. The front wheels are free to roll. Assume that the engine of the loader is powerful enough to generate a torque that will cause the rear wheels to slip. Fa75 m 025 m
- If the clamping force at G is 900 N, determine the horizontal force F that must be applied perpendicular to the handle of the lever at E. The mean diameter and lead of both single square- threaded screws at C and D are 25 mm and 5 mm, respectively. The coefficient of static friction is μ = 0.3. -200 mm- OA 200 mm B. C D E 125 mmThe 50-Ib cylinder is attached to a cord which passes over the drum. If the coefficient of static friction at the drum is Ms = 0.3, determine the maximum vertical force P that can be applied to the roller when 0 = 30° without causing the cylinder to move.The rope running over two fixed cylinders carries the 4-kg mass at one end. Determine the force P that must be applied to the other end to initiate motion. The coefficient of static friction between the rope and the cylinders is 0.15. BISECTION METHOD
- Determine the horizontal force P to start the 400-N wedge moving to the right. The angle of friction for all contact surfaces is o = 20°. WA = 2000 N WB = 400 N 15°The three identical rollers are stacked on a horizontal surface as shown. If the coefficient of static friction ugis the same for all pairs of contacting surfaces, find the minimum value of u, for which the rollers will not slip. Answer: Ps=The hand clamp is constructed using a square-threaded screw having a mean diameter of 36 mm, a lead of 4 mm, and a coefficient of static friction at the screw of us = 0.3. If the clamping force in the board AB is 300 N, determine the reversed force −F that must be applied perpendicular to the handle in order to loosen the screw. 50 mm F A B
- M. 0.3 m The block brake is used to stop the wheel from rotating when the wheel is subjected to a couple moment. Determine the smallest force P that should be applied as well as the magnitude of the corresponding reaction force at support C. Use the couple moment Mo = 430 N-m, the coefficient of static friction between the wheel and the block of 0.6, a = 1.8 m, b = 0.8 m, and c = 0.075m. Round all answers to the nearest integer. The smallest force P that should be applied is: N. The magnitude of the reaction force at support C is: N.2. The wedge blocks are used to hold the specimen in a tension testing machine. Determine the design angle 0 of the wedges so that the specimen will not slip regardless of the applied load. The coefficients of static friction are LA at A and l8 at B. Neglect the weight of the blocks. B Given: HA = 0.1 HB = 0.6 %3DThe hand clamp is constructed using a square-threaded screw having a mean diameter of 36 mm, a lead of 4 mm, and a coefficient of static friction at the screw of μ = 0.3. To tighten the screw, a force of F = 20N is applied perpendicular to the handle. Determine the clamping force in the board AB. 50 mm F F A B