5. The coefficient of static friction between the 75-lb box and the inclined surface is 0.10. The coefficient of static friction between the rope and the fixed cylinder is 0.05. Determine the force the woman must exert on the rope to cause the box to start moving up the inclined surface. What is the minimum force the woman must exert on the rope to hold the box in equilibrium on the inclined surface?

5. The coefficient of static friction between the 75-lb box and the inclined surface is 0.10. The coefficient of static friction between the rope and the fixed cylinder is 0.05. Determine the force the woman must exert on the rope to cause the box to start moving up the inclined surface. What is the minimum force the woman must exert on the rope to hold the box in equilibrium on the inclined surface?

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 7.8P: The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of...

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The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of static friction between each pad and the cylinder is 0.15. Find the smallest tension in the spring that would prevent the cylinder from rotating when the clockwise couple M=2200lbin. is applied. Neglect the weights of the members.
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.
The single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The angle of static friction is 8.5. (a) Determine the couple C that must be applied to the screw to start lifting a weight of 4000 lb. (b) What is the couple required to start lowering the weight?
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 60-kg cabinet is mounted on casters that can be locked to prevent their rotation. The coefficient of static friction between the floor and each caster is 0.35. 1. If h = 600 mm, determine the magnitude of the force P (in N) required to move the cabinet to theright, if all the casters are locked. (ANSWER: 206) 2. If h = 600 mm, determine the magnitude of the force P (in N) required to move the cabinet to the right if the casters at B are locked and the casters at A are free to rotate. (ANSWER: 178)
The uniform 20-lb ladder rests on the rough floor forwhich the coefficient of static friction is s = 0.45 andagainst the smooth wall at B. Determine the horizontalforce P the man must exert on the ladder in order tocause it to move. Answer: P = _____________
If the center of gravity of the stacked tables is at G,and the stack weighs 100 lb, determine the smallestforce P the boy must push on the stack in order tocause movement. The coefficient of static friction atA and B μs = 0.3. (The tables are locked together) Answer: P = _____________
The drum has a weight of 110 lb and rests on the floor for which the coefficient of static friction is μs = 0.30. Assume the center of gravity of the drum is located at its center. Pt. A : If a = 3 ft and b = 4 ft, determine the smallest magnitude of the force P that will cause the drum to start sliding. Pt. B: If a = 3 ft and b = 4 ft, determine the smallest magnitude of the force P that will cause the drum to start tipping. Pt. C : Based on the results in the previous two parts, the impending motion of the drum is.... Slipping or Tipping?
Determine the maximum and minimum values of weight "W" that the block on the left can have without the 100-N block on the right side slipping. The coefficients of static friction between the block and the inclined plane, and between the rope and the drum D are: mu_1 = 0.2 and mu_2 = 0.3, respectively. By what percentage would the maximum value of W vary if both coefficients of friction doubled?
Ross and Rachel are fighting if they were on a break. Ross is trying to get his stuff weighing 150. N placed on an inclined plane by pulling it upwards parallel to the inclined plane with 150. N force. However, Rachel is trying to stop Ross by exerting 50.0 N perpendicular to the inclined plane. The coefficients of friction between the box and the incline are us= 0.450 and = 0.350. Which of the following shows the most ideal force diagram for the object? A. C. 30⁰ 30* 50 N W 50 N 150 N 180 N B. D. 30⁰ 30⁰ 50 N FRIENDS 50 N 50 N 150 N 150 N 150 N
A 40- kg block is placed on the uniform 10-kg beam, that is supported by the cable, which is attached to the end of the beam. The cable wraps around the pulley, and the cable is connected to the block. If the coefficient of the static friction between the block and the beam is u,-0.6. Neglecting friction forces in the pulley. Determine the maximum distance that the block can be placed from 0 and still remain in eqilibrium. Assume the block will not flip. Distanc Fig. (6) m B Pulley 30 cm
A system is in equilibrium with the 150 Ibs block having a coefficient of friction of 0.4. Determine the coefficient of friction of the 100 lbs block. Pulley 150 Ibs 100 Ibs 45° 30