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Name: _____________________________
Section:
__________
Problem #1
(35 points):
A 40 lb lamp is suspended by two cables AB and AC, each having an
initial length of 5 ft.
Cable AB is made of aluminum (E = 10 x 10
6
psi,
ν
= 0.333) and cable AC
is made of steel (E = 30 x 10
6
psi,
ν
= 0.300).
Initial diameters are 0.1 in for AB and 0.05 in for
AC.
(a)
Calculate the normal stresses in AB and
AC.
(b) Determine the change in lengths of AB and
AC.
Does the lamp move left, right, or stay
in the center?
(c) Find the change in diameters of AB and
AC.
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Section:
__________
Problem #2
(35 points):
Two solid cylindrical rods ABC and CD are joined at C and subjected
to several axial loads, as shown below.
Rod ABC is made of aluminum (E = 10 x 10
6
psi,
ν
=
0.333) and rod CD is made of steel (E = 30 x 10
6
psi,
ν
= 0.300).
Initial diameters are 2.25 in for
ABC and 1.75 in for CD.
(a)
Determine the normal stresses in each
section of the rod.
(b) Find the total change in length of ABCD.
Does the length increase or decrease?
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 Spring '07
 Biegel

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