Problem 8.37 from Ferdinand Beer Bar AB is attached to collars that can slide on the inclined rodsJ45°45°shown. A force P is applied at point D located at a distance a fromend A. Knowing that the coefficient of static friction m, betweeneach collar and the rod upon which it slides is 0.30 and neglectingthe weights of the bar and of the collars, determine the smallestvalue of the ratio a/L for which equilibrium is maintained.DA

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Answered: Bar AB is attached to collars that can…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Two slender rods of negligible weight are pin-connected at C and attached to blocks A and B, each of weight W. Knowing that P =1.260W and that the coefficient of static friction between the blocks and the horizontal surface is 0.30, determine the range of values of θ,between 0 and 180°, for which equilibrium is maintained.
Two identical uniform boards, each with a weight of 40 lb, are temporarily leaned against each other as shown. Knowing that the coefficient of static friction between all surfaces is 0.40, determine (a) the largest magnitude of the force P for which equilibrium will be maintained, (b) the surface at which motion will impend.
Two slender rods of negligible weight are pin-connected at C and attached to blocks A and B , each with a weight W . Knowing that P = 1.260 W and that the coefficient of static friction between the blocks and the horizontal surface is 0.30, determine the range of values of 0 between 0 and 180° for which equilibrium is maintained.
Two slender rods of negligible weight are pin-connected at C and attached to blocks A and B , each with a weight W . Knowing that 0 = 80° and that the coefficient of static friction between the blocks and the horizontal surface is 0.30, determine the largest value of P for which equilibrium is maintained.
The 50-lb plate ABCD is attached at A and D to collars that can slide on the vertical rod. Knowing that the coefficient of static friction is 0.40 between both collars and the rod, determine whether the plate is in equilibrium in the position shown when the magnitude of the vertical force applied at E is (a) P=0, (b)=20 Ib.
Two slender rods of negligible weight are pin-connected at C and attached to blocks A and B, each of weight W. Knowing that θ = 80° and that the coefficient of static friction between the blocks and the horizontal surface is 0.30, determine the largest value of P for which equilibrium is maintained.
The 20-lb block A hangs from a cable as shown. Pulley C is connected by a short link to block E , which rests on a horizontal rail. Knowing that the coefficient of static friction between block E and the rail is μ s= 0.35 and neglecting the weight of block E and the friction in the pulleys, determine the maximum allowable value of 0 if the system is to remain in equilibrium.
A 120kg block is supported by a rope which is wrapped 1 1/2 times around a horizontal rod. knowing that the coefficient of static friction between the rope and the rod is 0.15, determine the range of values of P for equilibrium is maintained.
A slender rod with a length of L is lodged between peg C and the vertical wall, and supports a load P at end A . Knowing that the coefficient of static friction between the peg and the rod is 0.15 and neglecting friction at the roller, determine the range of values of the ratio L/a for which equilibrium is maintained.
Two rods are connected by a collar at B . A couple MA with a magnitude of 15 N.m is applied to rod AB . Knowing that the coefficient of static friction between the collar and the rod is 0.30, determine the largest couple MC for which equilibrium will be maintained.
A 6.5-m ladder AB leans against a wall as shown. Assuming that the coefficient of static friction μs is the same at A and B , determine the smallest value of µs for which equilibrium is maintained.
A uniform cord 50 in. long passes over a pulley at B and is attached to a pin support at A . Knowing that L = 20 in. and neglecting the effect of friction, determine the smaller of the two values of h for which the cord is in equilibrium.

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