weighing 200 lb at point D. The vertical wall is smooth and offers no frictional resistance. The coefficient of static friction between the ladder and the floor is 0.35. Show free-body diagram(s) a) Determine the smallest angle that the ladder can make with the floor before slipping begins. b) Determine the frictional force between the floor and the lower end of the ladder. 8'-0" 4'-0", 4'-0" TIRNI 0 P = 200 lb C D W = 48 lb TINNIT B INVIL Wall

weighing 200 lb at point D. The vertical wall is smooth and offers no frictional resistance. The coefficient of static friction between the ladder and the floor is 0.35. Show free-body diagram(s) a) Determine the smallest angle that the ladder can make with the floor before slipping begins. b) Determine the frictional force between the floor and the lower end of the ladder. 8'-0" 4'-0", 4'-0" TIRNI 0 P = 200 lb C D W = 48 lb TINNIT B INVIL Wall

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 7.23P: The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of...

See similar textbooks

Similar questions

The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of gravity of the spool is at G and the weight of the hanger is negligible. The wire wound around the hub of the spool is extracted by pulling its end with the force P. If the coefficient of static friction between the spool and the wall is 0.25, determine the smallest P that will extract the wire.
Draw the FBD of the entire frame, assuming that friction and the weights of the members are negligible. How many unknowns appear on this FBD?
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 coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.
Find the largest value of b/h at which the folding table is in equilibrium. The coefficients of static friction are 0.5 at A and 0.3 at C. Neglect the weight of the table.
A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.
A wedge is used to prop up the 6000-lb block of marble. The wedge angle is =30, and the angle of static friction is s=12 between all contact surfaces. Determine the smallest force P that would prevent the wedge from sliding out.
The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016, determine the force F required to advance the bar at a constant speed.
The friction tongs shown in Figure are used to lift a 350 kg casting. Knowing that h = 864 mm, determine the smallest allowable value of the coefficient of static friction between the casting and blocks D and D’.
A 6-m long ladder has a mass of 16 kg, and its center of gravity is 2.4 m from the bottom along the ladder. The ladder is resting on a 5° upward sloping floor at A and on a wall inclined to the right at 5° from the vertical at B, so that it makes an angle of 60° with the horizontal.How far up along the ladder can a 79-kg man climb before the ladder is on the verge of slipping? The angle of friction at all contact surfaces is 15°. Also determine the total reaction at A and B in Newton. Note: Point A is at the left of point B.
A 25-kg ladder, 4m long rests on a rough floor and against a vertical wall. The ladder makes an angle of 35o with the horizontal as shown. It starts to slip when a man weighing 75 kg has climbed halfway up. If coefficient of friction at the wall is 0.2, determine the coefficient of friction at the floor.
This is specifically a Statics problem. A 75-kg cabinet is mounted on casters which can be locked to prevent their rotation. The coefficient of static friction between each caster and the floor is 0.32. Assuming that the casters at both A and B are locked, determine a) the force P required to move the cabinet to the right, and b) the largest allowable value of h if the cabinet is not to tip over.