Q 40/A homogeneous bar of length / and weight w lb rests horizontally as shown in Fig. 40 with its free endon a block of weight W. the block W is at rest on a plane inclined at the angle a with the horizontal. Determine the necessary coefficient of friction u between the block and the plane for equilibrium. Assume no friction between the bar and the block. Q 40/A homogeneous bar of length I and weight w lb rests horizontally as shown in Fig. 40 with its free endon a block of weight W. the block W is at rest on a plane inclined at the angle a with the horizontal.Determine the necessary coefficient of friction u between the block and the plane for equilibrium.Assume no friction between the bar and the block.Fig. 40

Draw the free body diagram of the bar.

VA homogeneous bar of length / and weight w lb rests horizontally as shown in Fig. 40 with its free end on a block of weight W. the block W is at rest on a plane inclined at the angle a with the horizontal. Determine the necessary coefficient of friction u between the block and the plane for equilibrium. Assume no friction between the bar and the block. Fig. 40

VA homogeneous bar of length / and weight w lb rests horizontally as shown in Fig. 40 with its free end on a block of weight W. the block W is at rest on a plane inclined at the angle a with the horizontal. Determine the necessary coefficient of friction u between the block and the plane for equilibrium. Assume no friction between the bar and the block. Fig. 40

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.3P: Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair...

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Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair is denoted by G. The coefficient of static friction is 0.2 at B (the contact point between the chairs) and 0.35 at A, C, and D. Determine the smallest force P that would cause sliding.
A 1.1-kg disk A is placed on the inclined surface. The coefficient of static friction between the disk and the surface is 0.35. Is the disk in equilibrium if P=5.5N and =30?
The spring attached to the homogenous bar of weight W is undeformed when =0. Determine the smallest spring stiffness k for which the =0 equilibrium position will be stable. Use W = 10 lb, a = 24 in., and b = 6 in. Assume that the spring remains horizontal, which is a valid approximation if is small.
A 150-lb block rests on a horizontal floor. The coefficient of friction between the block and the floor is 0.30. A pull of 40 lb, acting upward at an angle of 30° to the horizontal, is applied to the block. Determine whether or not the block will slide. - Draw Free-body diagram - Solve most simple way - use the formula Fmax= Ms (N)
the uniform slender rod AB shown of weight w is supported by A peg at C and its end A rests against a vertical wall. the coefficients of friction at A and C are equal to f. find the ratio L/a when motion is impending. if θ=30˚ and f=0.3, find the ratio L/a.
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The 50 N homogeneous bar AB is suspended from a rope that runs over a small peg at C. The bar is kept in the position shown by the horizontal force P. Determine the smallest coefficient of static friction at C for which the bar will be at rest.
SITUATION 2: A packing crate of mass 40 kg is pulled by a rope as shown. Knowing that the coefficient of static friction between the crate and the floor is 0.35, answer the following questions: 4. If α = 40°, determine the magnitude of the force P required to move the crate, in N. (ANSWER: 139) 5. If the crate must be moved to the left along the floor without tipping, determine the largest allowable value of α in degrees. (ANSWER: 58)
A block weighing 200 N is just moved on a rough horizontal plane by a pull of 90 Newton acting at an angle of 30 degree with the horizontal. Determine: (i) the coefficient of friction . (ii) Push that should be applied to the block at the same angle to attain the condition of limiting equilibrium.
An 8400-kg truck is traveling on a level horizontal curve, resulting in an effective lateral force H (applied at the center of gravity G of the truck).Treating the truck as a rigid system with the center of gravity shown, andknowing that the distance between the outer edges of the tires is 1.8 m,determine (a) the maximum force H before tipping of the truck occurs,(b) the minimum coefficient of static friction between the tires and roadwaysuch that slipping does not occur before tipping.