Two rods are connected by a collar at B. A couple MA of magnitude 12lb·ft is applied to rod AB. Knowing that µs = 0.30 between the collar and rod AB, determine the largest couple MC for which...

Two rods are connected by a collar at B. A couple MA of magnitude 12lb·ft is applied to rod AB. Knowing that µs = 0.30 between the collar and rod AB, determine the largest couple MC for which equilibrium will be maintained.