Knowing that the coefficient of static friction between collar C and the vertical rod is 0.30, determine the magnitude of the largest and smallest couple M for which equilibrium is maintained in the position shown when θ = 35°, l = 500 mm, and P = 400 N. Problem 10.48: Denoting by μs the coefficient of static friction between collar C and the vertical rod, derive an expression for the magnitude of the largest couple M for which equilibrium is maintained in the position shown. Explain what happens if μs ≥ tan θ.

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