978-0073398242 Chapter 9 Solution Manual Part 21

subject Type Homework Help
subject Pages 9
subject Words 1223
subject Authors Brian Self, David Mazurek, E. Johnston, Ferdinand Beer, Phillip Cornwell

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PROBLEM 9.138
A section of sheet steel 0.03 in. thick is cut and bent into the
sheet metal machine component shown. Determine the mass
moment of inertia of the component with respect to each of the
coordinate axes. (The specific weight of steel is 490 lb/ft3.)
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PROBLEM 9.138 (Continued)
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PROBLEM 9.139
A framing anchor is formed of 0.05-in.-thick galvanized steel. Determine the
mass moment of inertia of the anchor with respect to each of the coordinate
axes. (The specific weight of galvanized steel is
3
470 lb/ft .)
SOLUTION
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PROBLEM 9.139 (Continued)
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PROBLEM 9.139 (Continued)
z
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PROBLEM 9.140*
A farmer constructs a trough by welding a rectangular piece
of 2-mm-thick sheet steel to half of a steel drum. Knowing
that the density of steel is
3
7850 kg/m
and that the thickness
of the walls of the drum is 1.8 mm, determine the mass
moment of inertia of the trough with respect to each of the
coordinate axes. Neglect the mass of the welds.
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PROBLEM 9.140* (Continued)
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PROBLEM 9.141
The machine element shown is fabricated from steel.
Determine the mass moment of inertia of the assembly with
respect to (a) the x axis, (b) the y axis, (c) the z axis. (The
density of steel is
3
7850 kg/m .)
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PROBLEM 9.141 (Continued)
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To the Instructor:
The following formulas for the mass of inertia of a semicylinder are derived at this time for use in the

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