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PROBLEM 10.73
Using the method of Section 10.8, solve Problem 10.39. Determine
whether the equilibrium is stable, unstable or neutral. (
Hint:
The
potential energy corresponding to the couple exerted by a torsional
spring is
2
1
,
2
K
θ
where
K
is the torsional spring constant and
is the
angle of twist.)
SOLUTION
Potential Energy
2
1
sin
2
VKP
l
=−
cos
dV
KP
l
d
2
2
sin
dV
l
d
=+
Equilibrium:
0: cos
dV
K
dP
l
==
For
400 lb,
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This note was uploaded on 07/11/2011 for the course EGM 2511 taught by Professor Jenkins during the Spring '08 term at University of Florida.
 Spring '08
 Jenkins
 Statics, Torsion

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