- #1

spacecataz

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## Homework Statement

The linear spring exerts a force at each of its ends that is proportional to the amount of stretch it undergoes. The spring modulus (proportionality constant) is 2 N/cm and its natural (unstretched) length is 1.5 m. Find the normal and friction forces (a) between cylinders A and B and (b) between B and the ground, if the weight of A is 500 N and that of each of B and C is 200 N.

## Homework Equations

Sum of moments = 0

Sum of forces = 0

fs = kx

## The Attempt at a Solution

[tex]\Sigma[/tex]MAB = N(r/2) - fr(1+[tex]\sqrt{3}[/tex]/2) + fs(r/2)

[tex]\Sigma[/tex]MBGround = (mg-N')(r/2) + f'r(1+[tex]\sqrt{3}[/tex]/2) + fsr

Am I on the right track? I don't really know where to go from here. Please help! Thanks.