Question

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1. The 20-N block A and the 30-N block B are supported by an incline that is held in the position shown. Knowing that the coefficient of static friction is 0.25 between the two blocks and zero between block B and the incline, determine the value of e for which motion is impending, 2. A 40-kg packing crate must be moved to the left along the floor without tipping. Knowing that the coefficient of static friction between the crate and the floor is 0.30, determine (a) the largest allowable value of a, (b) the corresponding magnitude of the force P. P 0.7 m 3. End A of a slender, uniform rod of length L and weight W bears on a surface as shown, while end B is supported by a cord BC. Knowing that the coefficient of friction is H.-0.30 determinc (a) the largest value for which motion is impending, (b) the corresponding value of the tension in the cord. 4. Determine the maximum force P that can be applied to block B without causing motion. The static coefficient of friction between all surfaces is us = 0.30. Block A weighs 50 N; block B weighs 150 N EN

Answer 1

Draw FOD af Block A Balance the forces ong caso n ong sino T-mg sind f zo ya T-mg sina-hing calda s ( tra Mi Na Mungera] b To ng (sind + 0,26 como 99= 20 (sind+ 0.29 caso) -

Now, FBD of block.B Ta set t ng sino Balance the forces, here, for = mx 20 cosa ng sino - Tafrao 2osino. - 0,29 x 20 cosa 1 7 losind-scaso =T lavate ③ and @ Bosino-5 cold = 20 sino a 15 casa 10 smo = local temd=1 10= 450 l So, motion will start at d = 457

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