4-58. The coefficients of static and kinetic frictionbetween the drum and brake bar are p. = 0.4 and ua = 0.3,respectively. If M - 50 N- m and P - 85 N, determine thehorizontal and vertical components of reaction at the pin 0.Neglect the weight and thickness of the brake. The drum hasa mass of 25 kg.300 mm-700 mm-B.F125 mm500 mm

Draw the free-body diagram of the brake bar. Draw the free-body diagram of the drum.

Answered: 4-58. The coefficients of static and…

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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*R4-8. The uniform 60-kg crate C rests uniformly on a 10-kg dolly D. If the front wheels of the dolly at A are locked to prevent rolling while the wheels at B are free to roll, determine the maximum force P that may be applied without causing motion of the crate. The coefficient of static friction between the wheels and the floor is p, - 0.35 and between the dolly and the crate, p - 0.5. L06 m- 15 m 0.8 m 025 m 0.25 m 1.5 m
The wedge is used to level the member. Determine the reversed horizontal force -P that must be applied to pull the wedge out to the left. The coefficient of static friction between the wedge and the two surfaces of contact is 1s = 0.15. Neglect the weight of the wedge.
6/51 The 10° doorstop is inserted with a rightward hori- zontal force of 30 lb. If the coefficient of static friction for all surfaces is = 0.20, determine the values Ny and N₁, of the normal forces on the upper and lower faces of the doorstop. With the given informa- tion, can you determine the force P required to ex- tract the doorstop? Ans. Nu 53.5 lb, N₁ = 50.8 lb Door 30 lb 10⁰
The high strength, square-threaded bolt that holds the three plates together has a nominal diameter of 1 in. The coefficient of friction is us = 0.36. The mean diameter of the thread is 0.94 in. The lead of the bolt is L = 0.160 in. Neglect friction between the nut and the washer. Determine the torque one must apply in in. Ib to the nut to induce a tension of 47,500 lb. (Enter the magnitude.) in. · Ib When that tension is achieved, determine the torque in in. · Ib required to loosen the bolt. (Enter the magnitude.) in. • Ib
The 447-N force is applied to the 94-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. P = 447 N 33° = 0.60 H = = 0.46 Answer: F = i N
The man pushes on the roller with force P through a handle that connects to the central axle of the roller. If the coefficient of static friction between the 49-lb roller and the floor is s = 0.22, determine the maximum force Pthat can be applied to the handle, so that roller rolls on the ground without slipping. Assume the roller to be a uniform cylinder. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper unit. Take g = 32.2 ft/s2. 1.5 ft 30° Your Answer: Answer units
consider the mass and pulley system in the attached file. mass m1 = 29 kg and mass m2 = 12kg. the angle of the inclined plane is given and the coefficient of kinetic friction between mass m2 and the inclined plane is uk = 0.12. assume the pulleys are massless and frictionless when mass m2 moves a distance 4.94 m up the ramp, how far downward does mass m1 move? d= ?
8-93. If a force of P = 30 N is applied to the handle of the lever, determine the largest couple moment M that can be resisted so that the wheel does not turn. The coefficient of static friction between the belt and the wheel is us = 0.3. Problems 8-92/93 M 300 mm B 60 mm A -25 mm D 700 mm P
R4-7. The uniform 20-kg ladder rests on the rough floor for which the coefficient of static friction is u, - 0.4 and against the smooth wall at B. Determine the horizontal force P the man must exert on the ladder in order to cause it to move. 25 m 4 m 2.5 m
2. The wedge blocks are used to hold the specimen in a tension testing machine. Determine the design angle 0 of the wedges so that the specimen will not slip regardless of the applied load. The coefficients of static friction are LA at A and l8 at B. Neglect the weight of the blocks. B Given: HA = 0.1 HB = 0.6 %3D
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