Finding Equilibrium in a Weighted System

AI Thread Summary
The discussion revolves around a physics problem involving a weighted system where a leg and cast weigh 220N, and the goal is to find the weight w2 and angle a to ensure no force is exerted on the hip joint. The poster is confused about how to approach the problem and seeks assistance in setting it up. Suggestions include conceptualizing the system by isolating the leg and using the center of mass to analyze the forces involved. The poster expresses gratitude for the guidance and indicates a willingness to try the proposed method. Overall, the thread highlights the challenges of balancing forces in a weighted system.
twistedps
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Homework Statement


Having trouble with this problem, can't figure it out! Please help me!
The persons cast is the green drawing (sorry by i was using ms paint)

The problem is as follows:
The leg and cast in the picture above weigh 220N (w1). Determine the weight w2 and the angle a needed so that no force is exerted on the hip joint by the leg plus the cast.

In case you can't make out the picture, the block on the left is 110N, and the angle is 40DEG on the left. w1 = 220N. the block on the right is w2. with angle a.

Thank you guys so much! I am rackin my brain here!
http://img82.imageshack.us/img82/8500/probrh0.th.jpg


Homework Equations


Not sure how to even out the two to figure this out, I am confused as where to start!


The Attempt at a Solution


I don't even know how to begin to setup this problem!
 
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Not to be gratuitously violent, but conceptually cut off the leg and do the problem with just the leg and the ropes. The rest of the body is not doing anything. Note that the ropes are connected at the center of mass of the leg, which is the only way you can have no force on the hip.
 
Last edited:
hrm, k, i think i get what your saying... i'll try this out! thanks!
 

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