F4-15. Determine the maximum force P that can be applied without causing the two 50-kg crates to move. The coefficient of static friction between each crate and the ground is a, = 0.25. 30
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- 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 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.F4-15. Determine the maximum force P that can be applied without causing the two 50-kg crates to move. The coefficient of static friction between each crate and the ground is a, = 0.25. в 30
- 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.F4-18. 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 mF4-16. If the coefficient of static friction at contact points A and B is u, = 0.3, determine the maximum force Pthat can be applied without causing the 100-kg spool to move. 0,6m 09m B.