When i try to do this i end up with a fourth order polynomial

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SUMMARY

The discussion centers on solving a mechanical problem involving a collar sliding on a vertical bar with two masses (ma = 20 kg, mb = 10 kg) and a spring constant of k = 250 kN/m. The objective is to determine the height (h) when the system is at rest, given that the spring is unstretched at h = 0.2m. Participants noted that the equations governing the forces and moments are straightforward; however, the geometry complicates the solution, resulting in a fourth-order polynomial in h.

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Homework Statement


The collar A slides on the vertical smooth bar. Masses ma=20 kg, mb = 10 kg, and spring constant k = 250 kN/m. When h = 0.2m, the spring is unstretched. Determine the value of h when the system is at rest.
20160916_204148.jpg


Homework Equations


sum of all forces equal zero
sum of all moments equal zero
f_g=mg
can some one please show me how to do this correctly?
 
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ThewyBenner said:

Homework Statement


The collar A slides on the vertical smooth bar. Masses ma=20 kg, mb = 10 kg, and spring constant k = 250 kN/m. When h = 0.2m, the spring is unstretched. Determine the value of h when the system is at rest.View attachment 106098

Homework Equations


sum of all forces equal zero
sum of all moments equal zero
f_g=mg
can some one please show me how to do this correctly?
I also get a 4th order polynomial in h. The equations are simple enough for the forces, but the clumsy geometry seems to create this complexity.
 
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Charles Link said:
I also get a 4th order polynomial in h. The equations are simple enough for the forces, but the clumsy geometry seems to create this complexity.

Ok, thank you I will try to solve it then.
 
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