Two collars and a fixed shaft, required friction?

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JFUNR
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Homework Statement


Two collars A and B can slide on vertical rods. Collar A and collar B are connected by a cord that passes over a fixed shaft at C. the static friction coefficient of any two contact surfaces is 0.2. the weight of collar B is 10 lb, neglect collar A's weight, determine the range of force F required to maintain the equilibrium.


Homework Statement



i1261.photobucket.com/albums/ii597/JacobtFry/statics8.png




Homework Equations





The Attempt at a Solution


 
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  • Diagram of two collars A and B on vertical rods joined by a cord over a fixed pulley shaft C, with angles 60 degrees at A, 30 degrees at B, beta = 90 degrees at C, force F pointing down at A, and dimensions of 10 in. on each side of the shaft.
    statics 8.png
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