ENGINEERING MECHANICS
14th Edition
ISBN: 9780136522409
Author: HIBBELER
Publisher: PEARSON
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Chapter 8.5, Problem 89P
A cable is attached to the 20-kg plate B, passes over a fixed peg at C, and is attached to the block at A. Using the coefficient of static friction shown, determine the smallest mass of block A so that will prevent sliding motion of B down the plane.
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Q1. A curved beam of a circular cross section of diameter "d" is fixed at one end and
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Fig.1
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(10 Marks)
You are working as an engineer in a bearing systems design company. The flow of
lubricant inside a hydrodynamic bearing (p = 0.001 kg m-1 s-1) can be approximated
as a parallel, steady, two-dimensional, incompressible flow between two parallel plates.
The top plate, representing the moving part of the bearing, travels at a constant speed,
U, while the bottom plate remains stationary (Figure Q1). The plates are separated by
a distance of 2h = 1 cm and are W = 20 cm wide. Their length is L = 10 cm. By
applying the above approximations to the Navier-Stokes equations and assuming that
end effects can be neglected, the horizontal velocity profile can be shown to be
y = +h
I
2h = 1 cm
x1
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moving plate
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Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
Chapter 8 Solutions
ENGINEERING MECHANICS
Ch. 8.2 - Determine the friction force at the surface of...Ch. 8.2 - Determine M to cause impending motion of the...Ch. 8.2 - Determine the force P to move block B.Ch. 8.2 - Determine the force P needed to cause impending...Ch. 8.2 - Determine the friction developed between the 50-kg...Ch. 8.2 - Determine the minimum force P to prevent the 30-kg...Ch. 8.2 - Determine the maximum force P that can be applied...Ch. 8.2 - If the coefficient of static friction at contact...Ch. 8.2 - Determine the maximum force P that can be applied...Ch. 8.2 - Prob. 6FP
Ch. 8.2 - Blocks A, B, and C have weights of 50 N, 25 N, and...Ch. 8.2 - If the coefficient of static friction at all...Ch. 8.2 - Using the coefficients of static friction...Ch. 8.2 - Determine the maximum force P the connection can...Ch. 8.2 - The tractor exerts a towing force T=400 lb....Ch. 8.2 - Prob. 3PCh. 8.2 - The winch on the truck is used to hoist the...Ch. 8.2 - The automobile has a mass of 2 Mg and center of...Ch. 8.2 - The automobile has a mass of 2 Mg and canter of...Ch. 8.2 - The block brake consists of a pin-connected lever...Ch. 8.2 - The block brake consists of a pin-connected lever...Ch. 8.2 - Prob. 9PCh. 8.2 - Prob. 10PCh. 8.2 - Determine the maximum weight W the man can lift...Ch. 8.2 - The block brake is used to stop the wheel from...Ch. 8.2 - If a torque of M=300 Nm is applied to the...Ch. 8.2 - The car has a mass of 1.6 Mg and center of mass at...Ch. 8.2 - Prob. 15PCh. 8.2 - The 180-Ib man climbs up the ladder and stops at...Ch. 8.2 - The 180-Ib man climbs up the ladder and stops at...Ch. 8.2 - The spool of wire having a weight of 300 Ib rests...Ch. 8.2 - Prob. 19PCh. 8.2 - The ring has a mass of 0.5 kg and is resting on...Ch. 8.2 - A man attempts to support a stack of books...Ch. 8.2 - The tongs are used to lift the 150-kg crate, whose...Ch. 8.2 - The beam is supported by a pin at A and a roller...Ch. 8.2 - The uniform thin pole has a weight of 30 Ib and a...Ch. 8.2 - The uniform pole has a weight of 30 Ib and a...Ch. 8.2 - The block brake is used to stop the wheel from...Ch. 8.2 - Solve Prob. 8-26 if the couple moment M0 is...Ch. 8.2 - A worker walks up the sloped roof that is defined...Ch. 8.2 - Prob. 29PCh. 8.2 - Two blocks A and B have a weight of 10 Ib and 6...Ch. 8.2 - Two blocks A and B have a weight of 10 Ib and 6...Ch. 8.2 - Determine the smallest force P that must be...Ch. 8.2 - The man having a weight of 200 Ib pushes...Ch. 8.2 - The uniform hoop of weight W is subjected to the...Ch. 8.2 - Prob. 35PCh. 8.2 - Determine the minimum force P needed to push the...Ch. 8.2 - Prob. 37PCh. 8.2 - The coefficient of static friction between the...Ch. 8.2 - Determine the smallest coefficient of static...Ch. 8.2 - Prob. 40PCh. 8.2 - If the coefficient of static friction at A and B...Ch. 8.2 - The 100-kg disk rests on a surface for which, B =...Ch. 8.2 - Investigate whether the equilibrium can be...Ch. 8.2 - Prob. 44PCh. 8.2 - The beam AB has a negligible mass and thickness...Ch. 8.2 - It is supported at one end by a pin and at the...Ch. 8.2 - Crates A and B weigh 200 Ib and 150 Ib,...Ch. 8.2 - Two blocks A and B, each having a mass of 5 kg,...Ch. 8.2 - The uniform crate has a mass of 150 kg. If the...Ch. 8.2 - The uniform crate has a mass of 150 kg. If the...Ch. 8.2 - Beam AB has a negligible mass and thickness, and...Ch. 8.2 - Beam AB has a negligible mass and thickness, and...Ch. 8.2 - Determine the smallest couple moment that can be...Ch. 8.2 - Determine the greatest angle so that the ladder...Ch. 8.2 - The wheel weights 20 lb and rests on a surface for...Ch. 8.2 - Prob. 56PCh. 8.2 - The man has a weight of 200 lb, and the...Ch. 8.2 - Prob. 1CPCh. 8.2 - Prob. 4CPCh. 8.2 - Explain how to find the maximum force this man can...Ch. 8.4 - Determine the largest angle that will cause the...Ch. 8.4 - If the beam AD is loaded as shown, determine the...Ch. 8.4 - The wedge is used to level the member. Determine...Ch. 8.4 - Prob. 61PCh. 8.4 - If P=250 N, determine the required minimum...Ch. 8.4 - Determine the minimum applied force P required to...Ch. 8.4 - If the coefficient of static friction between all...Ch. 8.4 - Determine the smallest force P needed to lift the...Ch. 8.4 - Prob. 66PCh. 8.4 - If the clamping force at G is 900 N, determine the...Ch. 8.4 - If a horizontal force of F = 50 N is applied...Ch. 8.4 - Prob. 69PCh. 8.4 - If the force F is removed from the handle of the...Ch. 8.4 - Prob. 71PCh. 8.4 - If the clamping force on the boards is 600 lb,...Ch. 8.4 - Prob. 73PCh. 8.4 - The square-threaded bolt is used to join two...Ch. 8.4 - The shaft has a square-threaded screw with a lead...Ch. 8.4 - If couple forces of F=35 N are applied to the...Ch. 8.4 - Prob. 77PCh. 8.4 - The device is used to pull the battery cable...Ch. 8.4 - Determine the clamping force on the board A if the...Ch. 8.4 - If the required clamping force on the board A is...Ch. 8.4 - If a horizontal force of P = 100 N is applied...Ch. 8.4 - Determine the horizontal force P that must be...Ch. 8.5 - A cylinder having a mass of 250 kg is to be...Ch. 8.5 - A cylinder having a mass of 250 kg is to be...Ch. 8.5 - A 180-lb farmer tries to restrain the cow from...Ch. 8.5 - The 100-lb boy at A is suspended from the cable...Ch. 8.5 - The 100-lb boy at A is suspended from the cable...Ch. 8.5 - Prob. 88PCh. 8.5 - A cable is attached to the 20-kg plate B, passes...Ch. 8.5 - Prob. 90PCh. 8.5 - Prob. 91PCh. 8.5 - Determine the force P that must be applied to the...Ch. 8.5 - Prob. 93PCh. 8.5 - Determine the weight of the cylinder if the...Ch. 8.5 - If slipping does not occur at the wall, determine...Ch. 8.5 - The coefficient of static friction between the...Ch. 8.5 - Prob. 97PCh. 8.5 - Show that the frictional relationship between the...Ch. 8.5 - The wheel is subjected to a torque of M = 50 N m...Ch. 8.5 - Using the coefficients of static friction...Ch. 8.5 - If the coefficient of static friction between the...Ch. 8.5 - Idler pulley A, and motor pulley B. If the motor...Ch. 8.5 - Using the coefficient of static friction...Ch. 8.5 - Determine the smallest counterclockwise twist or...Ch. 8.5 - Determine the largest angles so that the cord...Ch. 8.5 - Determine the smallest stretch of the spring...Ch. 8.8 - If the coefficient of static is, s = 0.3,...Ch. 8.8 - Prob. 108PCh. 8.8 - Prob. 109PCh. 8.8 - Prob. 110PCh. 8.8 - Prob. 111PCh. 8.8 - Prob. 113PCh. 8.8 - Prob. 114PCh. 8.8 - Prob. 115PCh. 8.8 - Prob. 116PCh. 8.8 - Prob. 117PCh. 8.8 - If the coefficient of static friction is. k....Ch. 8.8 - If the coefficient of static friction between the...Ch. 8.8 - If the coefficient of kinetic friction between the...Ch. 8.8 - if the force P is applied horizontally to the...Ch. 8.8 - Prob. 122PCh. 8.8 - Prob. 123PCh. 8.8 - Prob. 124PCh. 8.8 - Prob. 125PCh. 8.8 - The bell crank fits loosely into a 0.5-in-diameter...Ch. 8.8 - Prob. 127PCh. 8.8 - The vehicle has a weight of 2600 lb and center of...Ch. 8.8 - The tractor has a weight of 16 000 lb and the...Ch. 8.8 - Prob. 130PCh. 8.8 - Prob. 131PCh. 8.8 - The 1.4-Mg machine is to be moved over a level...Ch. 8.8 - Prob. 1RPCh. 8.8 - The uniform 60-kg crate C rests uniformly on a...Ch. 8.8 - A 35-kg disk rests on an inclined surface for...Ch. 8.8 - The cam is subjected to a couple moment of 5N m....Ch. 8.8 - The three stone blocks have weights of, WA =...Ch. 8.8 - Prob. 6RPCh. 8.8 - Prob. 7RPCh. 8.8 - Prob. 8RP
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