B C 100 kg 30° m PROBLEM 8.118 Bucket A and block C are connected by a cable that passes over drum B. Knowing that drum B rotates slowly counterclockwise and that the coefficients of friction at all surfaces are μs = 0.35 and μk = 0.25, determine the smallest combined mass m of the bucket and its contents for which block C will (a) remain at rest, (b) start moving up the incline, (c) continue moving up the incline at a constant speed.

Two blocks are joined by an inextensible cable as shown. The mass of block A is 189.5 kg and the mass of block B is 261.3 kg. If the system is released from rest, determine the tension (in N) in the cable. Assume that the coefficient of friction between block A and the plane is uk = 0.33 and that the pulley is weightless and frictionless. Round off only on the final answer expressed in 3 decimal places. Use g = 9.81 m/s? blocks.png ... A В

1. The coefficients of static and kinetic friction between the 100 – kg block and the inclined plane are 0.30 and 0.20, respectively. Determine (a) the friction force F acting on the block when P is applied with a magnitude of 200 N to the block at rest (b) the force P required to initiate motion up the incline from rest, and (c) the friction force F acting on the block if P = 600N P 100 kg 20° Hs = 0.30 Hk = 0.20 15°

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block A and B block have a mass of 7 kg and 10 kg, respectively. Using the indicated static friction coefficients, determine the greatest vertical force P that can be applied to the wire without causing motion. Uniforms

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. Answer: P = _____________

Three packages each of weight m = 9 kg A, B, and C are placed on a conveyor belt that is at rest. Between the belt and both packages A and C, the coefficients of friction are Ms = 0.30 and Mk = 0.20; between package B and the belt, the coefficients are Ms = 0.10 and Mk = 0.08. The packages are placed on the belt so that they are in contact with each other and at rest. Determine which, if any, of the packages will move and the friction force acting on each package. The frictional force acting on A is N The frictional force acting on B is N The frictional force acting on C is N Note: please show correct step by step working out. And double check final answers. Also for frictional force A, B & C show their directions as well. Thanks!

Determine the distance s that the 90 kg draftsman can climb without causing the 4-meter ladder to slip at its lower end A. The top of the ladder weighing 15 kg has a small pulley, and on the ground the coefficient of static friction is 0.25. The painter's center is directly above her feet. Answer. S 2.55 m% 3d by 4 m by 1.5 m

2. The 70-kg door is to close automatically using torsional springs 0.4 m mounted on the hinges. If the torque on each hinge is M = k0, where 0 M is measured in radians, what value k should I be looking for in each of two torsional springs? I desire the door to close as quickly as possible, 1.5 m but to have its speed not exceed 2 rad/s at any time. The door can be opened a maximum of 0 =120°. 0.4 m M 1.2 m

Peturn to tnis part. NOTE: This is a multl-part question. Once an answer is submitted, you wII be unabie A 1-lb ball A and a 2-lb ball B are mounted on a horizontal rod which rotates freely about a vertical shaft. The balls are held in the positions shown by pins where ra = 10 in. The pin holding Bis suddenly removed and the ball moves to position C as the rod rotates. Neglect friction and the mass of the rod and know that the initial speed of A is VA = 8 ft/s. VB 16 in. 16 in. -8 in.- A В Determine the radial and transverse components of the acceleration of ball B immediately after the pin is removed. | ft/s?. ]f/s?. The radial component is The transverse component is