F4-17. Determine the maximum force P that can be applied without causing movement of the 120-kg crate that has a center of gravity at G. The coefficient of static friction at the floor is u, = 0.4. 0.5 m 0.5 m 08 m 1.5 m 1.2 m
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- The 3600-lb car with rear wheel drive is attempting to push the 4500-lb crate. The center of gravity of the car is at G, and the coefficients of static friction are 0.6 at B and 0.2 at C. Determine if the crate will slide. (The car pulling the crate is analyzed in Prob. 7.19.)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.4. The mine car and its contents have a total mass of 6000 kg and a centre of gravity at G. If the coefficient of static friction 10 kN between the wheels and the 0.9 m •G tracks is u = 0.4 when the wheels are locked, find the normal force acting on the front wheels at B and the rear 0.15 m 0.6 m - 1.5 m wheels at A when the brakes at both A and B are locked. Does the car move? [Ans. NA = 16.5 kN, Ng =42.3 kN, the car does not move] %3D lyp
- If the center of gravity of the stacked tables is at G, and the stack weighs 100 lb, determine the smallest force P the boy must push on the stack in order to cause movement. The coefficient of static friction at A and B is s = 0.3. The tables are locked together. Answer: P =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 =Q6-Determine the maximum force P that can be applied without causing movement of the 90-kg crate that has a center of gravity at G. The coefficient of static friction at the floor is us = 0.5, as shown in the Figure 10. 1.2 m 0.5 m 0.5 m 0.7 m 1m
- Q5/ If a Moment of M 300 N. m is applied to the flywheel, determine the force that must be developed in the hydraulic cylinder CD to prevent the flywheel from rotating. The coefficient of static friction between the friction pad at B and the flywheel is 0.4. 8/12 Hib 0.6 m 1 m 30° B 60 mm M= 300 N-m 0.3 mThe uniform crate has a mass of 150 kg. If the coefficient of static friction between the crate and the floor is μs = 0.2, determine the smallest mass of the man so he can move the crate. The coefficient of static friction between his shoes and the floor is μ's = 0.45. Assume the man exerts only ahorizontal force on the crate.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.
- 86. The uniform 100-N (* 10-kg) ladder rests on the rough floor for which the cocfficjent of static friction is 0.4 and against the smooth wall at B. Determine the horizontal force Pthe man nust exert on the ladder in order to cause il to move. 2.5 m 4 m 2.5 m 3 m Prolos. 8-5/6Determine the force Prequired to maintain the 240-kg engine in the position for which 0 = 26°. The diameter of the pulley at B is negligible. Answer: P = IN 1.9 m 1.9 m 240 kg B NThe 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.