For the figure shown, two blocks are connected by a uniform solid rod attached to each block with frictionless oins. If the coefficient of friction under each block is 0.65 and B weighs 2700 N, find the minimum weight of A to prevent motion. A 30° 60° DO
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- The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.The two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical walls. If the coefficient of static friction between each bar and the wall is 0.25, determine the largest angle 6 for which the assembly will remain at rest.The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.
- The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair is denoted by G. The coefficient of static friction is 0.2 at B (the contact point between the chairs) and 0.35 at A, C, and D. Determine the smallest force P that would cause sliding.
- Refer to Fig 33. The homogenous body A weighs 120 lb. The coefficients of frictions are 0.30 between A and the plane and 2/pi between the rope and the drum. What value of W will cause motion of A to impend? Give solution. (Ans. W= 81.5 lb)The drum shown in the figure below has a weight of 100 N and rests on the floor for which the coefficient of static friction is 0.6. Assume tipping and determine the smallest value of P required for impending motion in N Assume sliding and determine the smallest value of P required for impending motion in N.The winch in the figure is used to move the 135kg uniform log. The coefficient of static friction between the log and the plane is 0.40. Which of the following most nearly gives the value of T for impending tipping?
- In the vise shown in the figure, the screw is single-threaded in the upper member; it passes through the lower member and is held by a frictionless washer. The pitch of the screw is 3 mm, its mean radius is 12 mm, and the coefficient of static friction is 0.15. Determine the magnitude P of the forces exerted by the jaws when M = 74-N·m couple is applied to the screw. The value of magnitude P is kN. Note: please show correct step by step working out!. And double check the final answer. Thanks.PROBLEM: To prevent a box from sliding down an inclined plane, student A pushes on the box in the direction parallel to the incline, just hard enough to hold the box stationary. In an identical situation, student B pushes on the box horizontally. If the weight of the box w= 20.0 N, the angle made by the incline with the horizontal θ=25o, and the coefficient of static friction µs=0.16, who has the easier job?A wedge assembly, composed of wedges X and Y, is designed to lift crate W whose weight is 1345 N, as shown in the figure below. What will be the maximum force P that can be applied before movement begins if the coefficient of friction for all surfaces of contact is 0.0875? Draw all necessary free-body diagrams and indicate the direction of impending motion.