The brake shown in Fig.is used to controlthe motion of block B. If the mass of block B is 25 kg andthe kinetic coefficient of friction between the brake drumand brake pad is 0.30, determine the force P required for aconstant-velocity descent.200 mm400 mm40 mm180 mm90 mmB

The mass of the block B is mB=25 kg. The coefficient of friction between the brake drum and pad is…

Answered: The brake shown in Fig. is used to…

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 7.63P: The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The...

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The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.
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.
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 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.
A 400-N cabinet is being pushed by a man on a concrete floor with a coefficient ofstatic friction of 0.37 and a coefficient of kinetic friction of 0.12. He exerts a force, F, of100 N at an angle of θ = 20° on the cabinet.Determine:i. The normal force, N (draw the FBD)ii. The characteristic of friction or the state of motion (static or kinetic)iii. The value of the actual friction force, Ff (show the equations of equilibrium)iv. The value of F if the motion is impending (show the equations of equilibrium)
3. Blocks A and B have a mass MA and MB, respectively. If the coefficient of static friction between A and B and between B and C is us and between the ropes and the pegs D andE µ's, determine the smallest force F needed to cause motion of block B. Given: E e = 45 deg Hs = 0.25 MA = 100 kg He's = 0.5 Mв 3 150 kg Р%3 30 N B m g = 9.81
2. Find the least value of P required to cause the system of blocks to have impending motion to the left. The coefficient of friction is 0.2 under each block. 300 Ib 100 lb 30 °
1. Draw a free body diagram for the block on the ramp that is attached to the string. There is no friction between the block and the ramp. The angle of the ramp is 35 degrees with respect to the horizontal, and the angle of the string is 45 degrees with respect to the horizontal. The block is at rest, and it has a mass of 10 kg. The acceleration due to gravity for this experiment is 9.8 m/s?. 450 35° 2. Decompose all of the forces into x and y forces 3. Sum the x forces and set them equal to what they should be set equal to. Sum the y forces and set THEM equal to what they should be set equal to.
Please, reaply as soon as posible! Static Problem The band brake shown controls the rotation of the drum. The coefficient of friction between the belt and the drum is 0.25. The weight of the lever is negligible.Determine the force P that must be applied at the end of the braking lever to resist a torque T = 200 lb in, if the torque is applied in the: a) Clockwise b) Counterclockwise direction.
Part 2 - Two blocks with masses ma = P kg and mB = 100 kg are connected with a flexible cable that passes over a frictionless pulley as shown in Fig. The coefficient of friction between the blocks is 0.2. If motion of the blocks is impending, determine the coefficient of friction between block B and the inclined surface and the tension in the cable between the two blocks Use the last TWO digits of your ID for the force P=24 A 40°
• Draw a free body diagram of the box on the incline. . Determine the weight (W) of the box on the incline surface. Determine the normal force (N) acting on the inclined box. Determine the friction force (F) acting on the inclined box. ● 7. A box of unknown weight is being pulled on a = 39 degree inclined surface by a frictionless pully system attached to a 540 pound box hanging off the pully. The coefficient of static friction between the box and the inclined surface is μ = 0.33 and both boxes are not moving. Answer the questions below: ● W= N = Ff= 0 W lbs lbs lbs 540 lbs
Q3 - Blocks A and B have a mass of 7 kg and 10 kg, respectively, and there are pulleys at C and D. Using the coefficients of static friction indicated, determine the following: 1- The smallest force P which can be applied to the cord that causes impending motion. 2- Does block B spill, flip over, or nothing happen? Prove that. 400 mm D B 500 mm HAB=0.1 A P HA=0.3 co

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