Concept explainers
If couple forces of F=35 N are applied to the handle of the machinist’s vise, determine the compressive force developed in the block. Neglect friction at the bearing A. The guide at B is smooth. The single square-threaded screw has a mean radius of 6 mm and a lead of 8 mm, and the coefficient of static friction is, μs = 0.27.
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Chapter 8 Solutions
Engineering Mechanics: Statics, Student Value Edition Plus Mastering Engineering with Pearson eText -- Access Card Package (14th Edition)
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Engineering Mechanics: Statics
- 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.arrow_forwardThe 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.arrow_forwardThe 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.arrow_forward
- 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?arrow_forwardThe cam is subjected to a couple moment of 5 N ⋅ m.Determine the minimum force P that should be applied to the follower in order to hold the cam in the position shown. The coefficient of static friction between the cam and the follower is μ = 0.4. The guide at A is smooth.arrow_forwardDetermine the angle of contact () in degrees of the belt supported on a pulley if the belt is having a load of 98 N on the tight side and a load of 60 N on the slack side. Take the coefficient of friction as 0.25.arrow_forward
- The pickup truck pulls the wooden crate, as shown in Figure 2. The truck has a mass of 1.25 Mg and a center of mass at G. The coefficient of static friction between the truck's wheel and the ground is µ = 0.5, and between the wooden crate and the ground is µs' = 0.4. Determine the greatest weight of the wooden crate the pickup truck can pull if: a) the truck has rear-wheel drive while the front wheels are free to roll, and b) the truck has four-wheel drive.arrow_forwardThe truck has a mass of 1.25 Mg and a center of mass at G. The coefficient of static friction between the wheels and the ground is Uw = 0.5, and between the crate and the ground, it is uc = 0.4. Determine = = the greatest load it can move if (a) the truck has rear-wheel drive while the front wheels are free to roll. (b) the truck has four-wheel drive.arrow_forwardThe block brake consists of a pin-connected lever and friction block at B. The coefficient of static friction between the wheel and the lever is μs = 0.3, and a torque of 5 N ⋅m is applied to the wheel. Determine if the brake can hold the wheel stationary when the force applied to the lever is (a) P = 30 N, (b) P = 70 N Draw the free-body diagram of the lever.arrow_forward
- If the beam AD is loaded as shown, determine the horizontal force P which must be applied to the wedge in order to remove it from under the beam. The coefficients of static friction at the wedge's top and bottom surfaces are μCA= 0.30 and μCB= 0.40, respectively. Neglect the weight and size of the wedge and the thickness of the beam. If P=0, is the wedge self-locking?arrow_forwardA 0.8 lb roll of paper is suspended from a wire hanger so that it rests against the wall. The hanger has a negligible weight and the bearing O can be considered as frictionless. The two ends of the hanger can be treated as pin joints. Determine the force P required to start turning the roll if theta = 37 degrees and the coefficient of static friction is 0.29.arrow_forwardTwo hemispheres having an inner radius of 2 ft and wall thickness of 0.25 in. are fitted together, and the inside pressure is reduced to -10 psi. If the coefficient of static friction is ms = 0.5 between the hemispheres, determine (a) the torque T needed to initiate the rotation of the top hemisphere relative to the bottom one, (b) the vertical force needed to pull the top hemisphere off the bottom one, and (c) the horizontal force needed to slide the top hemisphere off the bottom one.arrow_forward
- International Edition---engineering Mechanics: St...Mechanical EngineeringISBN:9781305501607Author:Andrew Pytel And Jaan KiusalaasPublisher:CENGAGE L