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Homework Statement
Collar A can slide on a frictionless vertical rod and is attached as shown to a spring. The constant of the spring is 4lb/in., and the spring is unstretched when h=12in. Knowing that the system is in equilibrium when h=16in., determine the weight of the collar.
Home-made diagram:
http://img182.imageshack.us/img182/9642/staticsuc5.th.png
Homework Equations
F=-kx
k=4lb/in
x=16in-12in=4in
F=-kx=-(4lb/in)*(4in)=16lbs
The Attempt at a Solution
With the pulley, the spring would still be carrying 100% of the collar's weight.
16lbs for the collar weight can't be the answer, can it?
Any help would be appreciated, it's been a while since I've taken a course in physics.
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