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Range of Q values for which equilibritum is maintained

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How can I solve the problem below.

The mechanism shown is acted upon by the force P of magnitude P=20 lb. Knowing that teta=25 degree and that the coefficient of static friction between collar C and the horizontal rod is 0.30, determine the range of values of Q for which equilibrium is maintained.

I included the mechanism drawing with this question attached.

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This solution is 109 words and included as an attached .doc file. It explains through step-by-step calculations how to calculate Q while maintaining equilibrium.

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Please see the attached file.

Take point of B as the reference point :

Let pressure on C be K and F can be in both directions -0.3K<=F<=0.3K

So to keep BCD not ...

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