Blocks A and B weigh 50 Ib and 30 lb, respectively. Using the coefficients of static friction indicated, determine the greatest weight of block E without causing motion.

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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 = _____________

S If the coefficients of static friction at contact points A and B areμ = 0.21 andμ¹ = 0.24 respectively, determine the smallest force P that will cause the 179-kg spool to have impending motion. Supply your answer in Newtons. 400 mm 200 mm B P 150 mm

Force P is applied to the end of a rope being used to hold the 50-lb block on the 20° incline. The coefficient of static friction between the block and the incline is u. = 0.30. Determine the largest value of P for which the block is in equilibrium and will not begin to move up the incline when 0 = 15°. Hs = 0.30 20° The solution to this problem requires a free-body diagram of the block, and a sketch of the coordinate system used. Use the components of the forces with EF = 0 and EF, = 0 to y apply ΣF=0.

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If the coefficient of static friction at all contacting surfaces is µ„„ determine the inclination 0 at which the identical blocks, each of weight W, begin to slide. with fbd A B

Determine the minimun force that is needed for F to move B to the right. B has weight 100 N, A has weight 10 N. Friction coefficeint for all contact surfaces including peg is 0.3