Blocks A and B have masses of 10 kg and 20 kg respectively. The coefficient of static friction between A and B is 0.20, between B and C is 0.10 and at D, 0.15. Block B impends to slide up the 30°- incline plane. (A) Draw the FBD of block A (B) Draw the FBD of block B (C) What is the weight of the hanging block that will maintain static equilibrium? Note: Use T, and T, for tension on the tight side and slack side of the cord respectively. A 20' w/

Blocks A and B have masses of 10 kg and 20 kg respectively. The coefficient of static friction between A and B is 0.20, between B and C is 0.10 and at D, 0.15. Block B impends to slide up the 30°- incline plane. (A) Draw the FBD of block A (B) Draw the FBD of block B (C) What is the weight of the hanging block that will maintain static equilibrium? Note: Use T, and T, for tension on the tight side and slack side of the cord respectively. A 20' w/

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 7.24P: A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The...

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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.
The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.
A block with a mass of 100 kg (left-block) is connected to another block of mass M (right-block) by a cable that passes over a fixed drum as shown below. The coefficient of static friction between the left-block and the floor is 0.45, between the right-block and floor is 0.4, and between the cable and the fixed drum is 0.25. Ignore tipping (overturning). Determine the minimum mass of the left-block for which motion does not occur.
Consider the system shown below. The incline plane is fixed and the coefficient kinetic friction between M and 2M is ?1, and coefficient kinetic friction between the plane and 2M is ?2. Let M=2.0kg, ?=22o, ?1=0.14, and ?2=0.25. (a) What is the magnitude of the frictional force on mass M? (b) What is the magnitude of the total frictional force on mass 2M? (c) What is the acceleration of mass M? (d) What is the acceleration of mass 2M?
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For the system shown, the masses of A and B are 55kg and 135kg, respectively. the coefficient of static friction between block B and surface C is 0.12 and the coefficient of static friction between blocks A and B is 0.10. the coefficient of friction between the rope and the pulley is 0.10. a. What is the tension force in the rope connected to block B if the system is in equillibrium? b. What is the magnitude of the friction force between block B and the horizontal surface C if the system is in equillibrium? c.What is the maximum mass that can be suspended as shown and still maintain equillibrium.
As shown in figure, find that at what distance body Awill attain a velocity of 3m/s when starts from rest.Assume coefficient of friction as 0.2 and pulleys are frictionless and weightless.
Weights of blocks x, y and z are 8 lb, 12 lb and 80 lb respectively. Between all contact surfaces, the coefficient of static friction is 0.40 and that of kinetic friction is 0.30. What vertical force F must be applied to block x, so that block z will start moving upward?
PROBLEM: To prevent a box from sliding down an inclined plane, student A pushes on the box in the direction parallel to the incline, just hard enough to hold the box stationary. In an identical situation, student B pushes on the box horizontally. If the weight of the box w= 20.0 N, the angle made by the incline with the horizontal θ=25o, and the coefficient of static friction µs=0.16, who has the easier job?
Blocks A, B, and C have weights of 50 N, 25 N, and 15 N, respectively. Determine the smallest horizontal force P that will cause impending motion. The coefficient of static friction between A and B is μs = 0.3, between B and C,μ's = 0.4, and between block C and the ground, μ"s = 0.35.
A box of mass m = 30 kg is at rest on a ramp inclinedat 50° to the horizontal. The coefficients of friction between the box and the ramp are mS = 0.80 and mK = 0.70. Determine the magnitude of the largest force that can be applied upward, parallel to the ramp, if the box is to remain at rest.
For the system shown, the masses of A and B are 55kg and 135kg, respectively. the coefficient of static friction between block B and surface C is 0.12 and the coefficient of static friction between blocks A and B is 0.10. the coefficient of friction between the rope and the pulley is 0.10. What is the tension force in the rope connected to block B if the system is in equillibrium? What is the magnitude of the friction force between block B and the horizontal surface C if the system is in equillibrium? What is the maximum mass that can be suspended as shown and still maintain equillibrium.