Fluid Mechanics Fundamentals And Applications
3rd Edition
ISBN: 9780073380322
Author: Yunus Cengel, John Cimbala
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 1, Problem 1CP
What is a fluid? How does it differ from a solid? How does a gas differ from a liquid?
Expert Solution & Answer
To determine
The definition of fluid.
The difference between solids and fluids.
The difference between gases and fluids.
Explanation of Solution
A fluid is substance which can flow under the action of the shear force. The examples of the fluid are given below:
Liquid, gas, vapor.
In solid state, the molecules of a substance are tightly bound to each other as the molecules have a fixed position in space. A solid exhibits rigidity and distinct shape. The intermolecular distance in a solid state is the least while the intermolecular force of attraction is the strongest.
Solids regain original shape if the shear force is within elastic limit when, the force is removed. But fluid never regains original shape after the removal of force.
Gas molecules are in a state of random motion. They exhibit the least intermolecular force of attraction and gases lack a definite shape. The intermolecular distance is very large due to which the particles of gases are widely separated from each other. The density and viscosity of gas is less compared to solid and liquid. Gas molecules are highly vulnerable to change in temperature and pressure.
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4. Two links made of heat treated 6061 aluminum (Sy = 276 MPa, Sys = 160 MPa) are pinned
together using a steel dowel pin (Sy = 1398 MPa, Sys = 806 MPa) as shown below. The
links are to support a load P with a factor of safety of at least 2.0. Determine if the link will
fail first by tearout, direct shear of the pin, bearing stress on the link, or tensile stress at
section AA. (Hint: find the load P for each case and choose the case that gives the smallest
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P
8 mm
P
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P
1. For a feature other than a sphere, circularity is where:
A. The axis is a straight line
B. The modifier is specified with a size dimension
C. All points of the surface intersected by any plane
perpendicular to an axis or spine (curved line) are
equidistant from that axis or spine
D. All points of the surface intersected by any plane
passing through a common center are equidistant
from that center
2. What type of variation is limited by a circularity toler-
ance zone?
A. Ovality
B. Tapering
C. Bending
D. Warping
3. How does the Rule #1 boundary affect the application
of a circularity tolerance?
A. The modifier must be used.
B. The feature control frame must be placed next to
the size dimension.
C. The circularity tolerance value must be less than
the limits of size tolerance.
D. Circularity cannot be applied where a Rule #1
boundary exists.
4. A circularity tolerance may use a
modifier.
A. Ø
B. F
C. M
D. ℗
5. A real-world application for a circularity tolerance is:
A. Assembly (i.e.,…
3. A steel bar is pinned to a vertical support column by a 10 mm diameter hardened dowel pin,
Figure 1. For P = 7500 N, find:
a. the shear stress in the pin,
b. the direct bearing stress on the hole in the bar,
c. the minimum value of d to prevent tearout failure if the steel bar has a shear strength of
175 MPa.
support column
pin
bar
thickness of bar = 8 mm
h
d
150 mm
Chapter 1 Solutions
Fluid Mechanics Fundamentals And Applications
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