The robotic manipulator is stationary and the y axis is vertical. The weights of the arms AB and BC act at their midpoints. The direction cosines of the centerline of arm AB are cos θx = 0.174. cos By = 0.985. cos θZ = 01 and the direction cosines of the centerline of arm BC are cos θx = 0.743, cos By— 0.557. cos θZ = —0.371. The support at A behaves like a fixed support.

(a) What is the sum of the moments about A due to the weights of the two arms?

(b) What are the reactions at A?

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