MECHANICS OF MATERIALS
10th Edition
ISBN: 2818440034374
Author: HIBBELER
Publisher: PEARSON
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Textbook Question
Chapter 4.6, Problem 4.83P
The wires AB and AC are made of steel, and wire AD is made of copper. Before the 150-lb force is applied, AB and AC are each 60 in. long and AD is 40 in. long. If the temperature is increased by 80°F, determine the force in each wire needed to support the load. Each wire has a cross-sectional area of 0 0123 in2. Take Est = 29(103) ksi, Ecu = 17(103) ksi, αst = 8(10-6)/°F, αcu = 9.60(10-6)/°F.
Prob. 4–83
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Question 1
You are working as an engineer in a bearing systems design company. The flow of
lubricant inside a hydrodynamic bearing (µ = 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
1 dP
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-y² + Ay + B
y= +h
Ꮖ
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Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
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Question 2
You are an engineer working in the propulsion team for a supersonic civil transport
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Chapter 4 Solutions
MECHANICS OF MATERIALS
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