Suppose that the lengths of the bars in Problem 9.57 are LAB = 1.2 m and LAC = 1.0 m and their masses are mAB = 3.6 kg and mAC = 3.0 kg.
(a) What is the magnitude of the friction force exerted on the plate at B?
(b) What is the minimum coefficient of static friction at B necessary for the structure to remain in equilibrium?
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