4-47. The Y0-kg man climbs up the ladder and stops at theposition shown after he senses that the ladder is on the vergeof slipping. Determine the coefficient of static frictionbetween the friction pad at A and ground if the inclination ofthe ladder is e = 60° and the wall at B is smooth. The centerof gravity for the man is at G. Neglect the weight of theladder.3mFoo

The weight of the man is 90g = 90(9.8) = 883 N

Answered: 4-47. The Y0-kg man climbs up the…

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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8-54. Two blocks A and B, each having a mass of 6 kg, are connected by the linkage shown. If the coefficients of static friction at the contacting surfaces are μB = 0.8 and μA = 0.2, determine the largest vertical force P that may be applied to pin C without causing the blocks to slip. Neglect the weight of the links. A 30° P C 30° 30° B
The 100-lb boy at A is suspended from the rope that passes over the quarter circular cliff rock. Determine if it is possible for the 185-lb woman to hoist him up; and if this is possible, what smallest force must she exert on the rope? The coefficient of static friction between the rope and the rock is μ = 0.2, and between the shoes of the woman and the ground μ' = 0.8.
8-26. The refrigerator has a weight of 180 lb and rests on a tile floor for which us = 0.25. If the man pushes horizontally on the refrigerator in the direction shown, determine the smallest magnitude of horizontal force needed to move it. Also, if the man has a weight of 150 lb, determine the smallest coefficient of friction between his shoes and the floor so that he does not slip. -3 ft- F15 ft- 4 ft 3t
*8-4. The winch on the truck is used to hoist the garbage bin onto the bed of the truck. If the loaded bin has a weight of 8500 lb and center of gravity at G, determine the force in the cable needed to begin the lift. The coefficients of static friction at A and B are μÃ = 0.3 and µ = 0.2, respectively. Neglect the height of the support at A. Prob. 8-4 G A 10 ft 12 ft B 30°
4-79. The man has a mass of 40 kg. He plans to scale the vertical crevice using the method shown. If the coefficient of static friction between his shoes and the rock is u) = 0.4 and between his backside and the rock, = 0.3, determine the smallest horizontal force his body must exert on the rock in order to do this.
5-2. The coefficient of friction between the 200-15 homogeneous cylinder of Fig. PS-2 and horizontal plane is 0.4. The vertical plane is smooth. Deter- mine the frictional force exerted on the cylinder by the horizontal surface. 40-1b
The uniform rod has a mass of 13.09 kg and rests on the inside of the smooth ring at B and on the ground at A. If the rod is on the verge of slipping, determine the coefficient of static friction between the rod and the ground.
8-11. Determine the maximum weight W the man can lift with constant velocity using the pulley system, without and then with the "leading block" or pulley at A. The man has a weight of 200 lb and the coefficient of static friction between his feet and the ground is u, = 0.6. B 45° (a)
The 553-N force is applied to the 96-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. H = 0.71 = 0.51 Answer: F = i 35° N P = = 553 N
5) The crate at a 10° incline has a mass of 350 kg and is subjected to a towing force P acting at a 20° angle with the horizontal. If the coefficient of static friction is µs = 0.5, determine the magnitude of P needed start impending motion. Given: M = 350 kg = 20 deg = 10 deg Us = 0.5 m g = 9.81
* Incorrect The 175-lb man with center of gravity G supports the 88-lb drum as shown. Find the greatest distance x at which the man can position himself without slipping if the coefficient of static friction between his shoes and the ground is 0.48. 14' 88 lb Answer: x = i 8.90 12.9¹ ft
Determine the smallest force P that must be applied in order to cause the 150 lb uniform crate to move. The coefficient of static friction between the crate and the floor is us=0.5.

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