1 Introduction To Statics 2 Basic Operations With Force Systems 3 Resultants Of Force Systems 4 Coplanar Equilibrium Analysis 5 Three-dimensional Equilibrium 6 Beams And Cables 7 Dry Friction 8 Centroids And Distributed Loads 9 Moments And Products Of Inertia Of Areas 10 Virtual Work And Potential Energy Chapter7: Dry Friction
Chapter Questions Section: Chapter Questions
Problem 7.1P: Can the two blocks be in equilibrium in the position shown? Justify your answer. All surfaces are... Problem 7.2P: Determine the range of P for which the system of two blocks will be in equilibrium. Friction is... Problem 7.3P: Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair... Problem 7.4P: The two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical... Problem 7.5P: The contact surface between the 36-lb block and 20-lb homogenous cylinder is frictionless. Can the... Problem 7.6P: The uniform bar AB of weight W is leaning against a vertical wall. The coefficient of static... Problem 7.7P: The center of gravity of the 50-kg spool is at G. A cable wound around the hub of the spool is... Problem 7.8P: The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of... Problem 7.9P: The 200-lb homogenous cylinder of radius R is pushed up the incline by a cart. Determine the... Problem 7.10P: The rear-wheel-drive pickup truck, with its center of gravity at G, is to negotiate a bump from a... Problem 7.11P: Solve Prob. 7.10 assuming that the pick-up truck has front-wheel drive. Problem 7.12P: The 2-lb bar is pinned at A and rests on the 4-lb spool at B. Both bodies are homogenous. If the... Problem 7.13P: The horizontal force P acts on the rim of the homogeneous cylinder of radius R and weight W.... Problem 7.14P: The uniform bar and the homogeneous cylinder each have a mass of 24 kg. The static coefficient of... Problem 7.15P: A stepladder consisting of two legs pinned together at C is resting on a rough floor. Will a 170-lb... Problem 7.16P: The mass of the unbalanced disk is m, and its center of gravity is located at G. If the coefficient... Problem 7.17P: The two uniform sheets of plywood, each of length L and weight W, are propped as shown. If the... Problem 7.18P: Find the largest value of b/h at which the folding table is in equilibrium. The coefficients of... Problem 7.19P: The 3600-lb car with rear Wheel drive is attempting to tow the 4500-lb crate. The center of gravity... Problem 7.20P: The 3600-lb car with rear wheel drive is attempting to push the 4500-lb crate. The center of gravity... Problem 7.21P: The man is trying to push the homogeneous 20-kg ladder AB up a wall by applying the horizontal force... Problem 7.22P: A 1.1-kg disk A is placed on the inclined surface. The coefficient of static friction between the... Problem 7.23P: The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of... Problem 7.24P: A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The... Problem 7.25P: The uniform bar of weight W is supported by a ball-and-socket joint at A and rests against a... Problem 7.26P: The uniform plank is initially at rest on the fixed support at A and the stationary drum at B. If... Problem 7.27P: The two homogeneous bars with the weights shown are connected with a pin at B and suspended from a... Problem 7.28P: The man pushes the 120-lb homogeneous crate with the horizontal force P. Determine the largest... Problem 7.29P: The 80-kg crate has its center of gravity at G. Determine the smallest force P that will initiate... Problem 7.30P: Solve Prob. 7.29 if =0. Problem 7.31P: The 120-lb door with its center of gravity at G is hung from a horizontal track at A and B. Find the... Problem 7.32P: Determine the largest force P for which the 16-kg uniform bar remains in equilibrium. Problem 7.33P: Determine the largest angle for which the homogeneous block remains at rest. Problem 7.34P: The cylinder and the block are connected by a horizontal cord. Determine the largest couple C that... Problem 7.35P: The weight of the cylindrical tank is negligible in comparison to the weight of water it contains... Problem 7.36P: The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find... Problem 7.37P: The two homogenous boxes are stacked vertically. Determine the smallest force P that would initiate... Problem 7.38P: Two concrete blocks weighing 320 lb each form part of the retaining wall of a swimming pool. Will... Problem 7.39P: Derive the expression for the largest angle ? for which the homogeneous block stays in equilibrium. Problem 7.40P: The 60-lb plank rests on a frictionless roller at A, and the 20-lb triangular support BD. Both... Problem 7.41P: The 2000-lb weight of the trailer is distributed equally between its two wheels, one on each side of... Problem 7.42P: Determine the smallest force P, applied to the plunger D, that will prevent the couple C=200Nm from... Problem 7.43P: The homogenous cylinder of weight W is at rest against a curb. Determine the smallest coeffient of... Problem 7.44P: The uniform bar of length L and weight W is kept in the horizontal position by friction. Determine... Problem 7.45P: The movable bracket of negligible weight is mounted on a vertical post. The coefficient of static... Problem 7.46P: The 200-lb man walks up the inclined plank of negligible weight. The coefficients of static friction... Problem 7.47P: Determine the smallest coefficient of static friction at A for which the system shown is... Problem 7.48P: Find the smallest distance d for which the hook will remain at rest when acted on by the force P.... Problem 7.49P Problem 7.50P: The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the... Problem 7.51P: The two 200-lb blocks are pushed apart by the 15 wedge of negligible weight. The angle of static... Problem 7.52P: Determine the smallest horizontal force P that must be applied to block B to cause impending motion.... Problem 7.53P: The device shown is used to measure the kinetic coefficient of friction between the rotating shaft S... 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... Problem 7.55P: A wedge is used to prop up the 6000-lb block of marble. The wedge angle is =30, and the angle of... Problem 7.56P: The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The... Problem 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a... Problem 7.58P: 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... Problem 7.59P: How many turns of rope around the capstan are needed for the 40-lb force to resist the 8000-lb pull... Problem 7.60P: The force P applied to the brake handle enables the band brake to reduce the angular speed of a... Problem 7.61P Problem 7.62P: The 120-kg block A is suspended from a rope that runs around the fixed pegs B and C. The coefficient... Problem 7.63P: The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The... Problem 7.64P: The 30-lb weight is attached to a rope that runs over a fixed cylinder. The coefficient of static... Problem 7.65P: The rail AB of negligible weight is suspended from a rope that runs around two fixed pegs. The... Problem 7.66P: The blocks A and B of weights WA and WB are joined by a rope that passes over the fixed peg C. The... Problem 7.67P: The 150-lb weight is attached to a rope that passes over the fixed cylinders A and B. The... Problem 7.68P: The 50-lb homogeneous bar AB is suspended from a rope that runs over a small peg at C. The bar is... Problem 7.69P: The collar bearing carries the axial load P = 400 N. Assuming uniform pressure between the collar... Problem 7.70P: Solve Sample Problem 7.16 if the contact pressure under the polisher varies parabolically from p0 at... Problem 7.71P: The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If... Problem 7.72P Problem 7.73P: The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the... Problem 7.74P Problem 7.75P: The single-plate clutch transmits the torque C from the input shaft on the left to the output shaft... Problem 7.76P: The clutch described in Prob. 7.75 is to transmit a torque of 120lbft when the total spring force... Problem 7.77P: The cone clutch transmits the torque C through a conical friction surface with cone angle . The... Problem 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,... Problem 7.79P: The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a)... Problem 7.80P Problem 7.81P: Calculate the horizontal force P required to push the 85-lb lawn mower at constant speed. The center... Problem 7.82RP: The uniform pole BC of length L and weight W is placed on rough ground, supported by the rope AC.... Problem 7.83RP: The homogeneous bar AB of weight W and length L is lifted by the force P that is perpendicular to... Problem 7.84RP: Find the smallest angle for which the uniform crate can be tipped about corner A. Also compute the... Problem 7.85RP Problem 7.86RP: Determine the largest angle for which the uniform box can be in equilibrium. Problem 7.87RP: Can the uniform bar of weight W remain at rest in the position shown? Problem 7.88RP: The panel of weight W with its center of gravity at G is placed between vertical guides and... Problem 7.89RP: The woman is trying to move the crate of weight W by pulling on the rope at the angle to the... Problem 7.90RP: The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The... Problem 7.91RP: Find the largest clockwise couple C that can be applied to cylinder A without causing motion. The... Problem 7.92RP: The test specimen AB is placed in the grip of a tension-testing machine and secured with a wedge.... Problem 7.93RP: The coefficient of static friction between the 5-kg block and the inclined plane is 0.32. Determine... Problem 7.94RP: The uniform bars AB and BC are connected with a pin at B and placed on a horizontal surface. The... Problem 7.71P: The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If...
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Transcribed Image Text: The 46 kg block is hoisted up the incline using the cable
and motor arrangement shown. (Figure 1)
Figure
Vo = 2 m/s
1 of 1
Part A
The coefficient of kinetic friction between the block and the surface is μ = 0.4. If the block is initially moving up the plane at
v0 = 2 m/s, and at this instant (t = 0) the motor develops a tension in the cord of T = (300+120√t) N, where t is in
seconds, determine the velocity of the block when t = 3 s.
Express your answer to three significant figures and include the appropriate units.
v2 = 5.21
Submit
μÀ
m
S
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Branch of science that deals with the stationary and moving bodies under the influence of forces.
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