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PROBLEM 10.104
A vertical bar
AD
is attached to two springs of constant
k
and is in
equilibrium in the position shown. Determine the range of values of the
magnitude
P
of two equal and opposite vertical forces
P
and
−
P
for
which the equilibrium position is stable if (
a
)
,
A
BC
D
=
(
b
)
2
.
A
D
=
SOLUTION
For both (
a
) and (
b
): Since
P
and
−
P
are vertical, they form a couple of
moment
sin
θ
=+
P
MP
l
The forces
F
and
−
F
exerted by springs
must, therefore, also form a
couple, with moment
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 Spring '08
 Jenkins
 Statics

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