The brake is to be designed to be self locking, that is, it will not rotate when no load P is applied to it when the disk is subjected to a clockwise couple moment Mo. Determine the distance d of the lever that will allow this to happen. The coefficient of static friction at B is H₂- Us=0.48 a=0.6ft

The brake is to be designed to be self locking, that is, it will not rotate when no load P is applied to it when the disk is subjected to a clockwise couple moment Mo. Determine the distance d of the lever that will allow this to happen. The coefficient of static friction at B is H₂- Us=0.48 a=0.6ft

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 7.54P: The single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The...

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The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The coefficient of static friction between the threads is 0.4. Determine (a) the torque C0 that must be applied to the screw in order to produce a 28-lb clamping force at A; and (b) the torque required to loosen the clamp.
The screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of the screw are threaded in opposite directions (right- and left-handed threads). The coefficient of static friction between the threads is 0.08. Calculate the torque C0 that must be applied to the screw in order to start the 1200-1b load moving (a) upward; and (b) downward.
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?
The two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical walls. If the coefficient of static friction between each bar and the wall is 0.25, determine the largest angle 6 for which the assembly will remain at rest.
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.
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.
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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.
A multiple disc clutch is used to operate the speed regulating gears of lathe. If the torque delivered by the clutch is 400 lbs. in.,evaluate the number of discs are necessary and the max. force acting on them while the clutch is in operation. Limit the disc friction surface sizes between 5 in. adn 3 in. Take the factor of safety as 2 , coefficient of friction varies from 0.150 to 0.200, and the pressure as (100-24/100) psi.
estion 6 The crate has a weight of 490 lb and a center of gravitY at G rests on the floor for which the coefficient of static friction is equal to 0.3. if the force P=200 lb is applied as shown in the figure below, The force of friction developed between the crate and the ground is. yet aered ered out of L00 Flar -2 ft 2 ft- 3 4 ft 3 ft Figure 1
The Syatiomn P=z00 N Psimio Tz +ve to kg. Pcosio- Find "acceleration" of the setup. Coefficient of friction is at u = 0.2 and the mass of every bod y 30 15 ty Ty
The small roller on the upper end of the uniform rod rests against the vertical surface at A while the rounded end B rests on the platform which is slowly pivoted downward beginning at the horizontal position shown. For a coefficient of static friction , 0.37 at B, determine the angle of the platform at which slipping will occur. Neglect the size and friction of the roller and the small thickness of the platform. Assume = 28° Answer: 8- L H₁ B