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问答题

The mechanism is located in a vertical plane and is hinged by a right-angle bent rod AB and straight rods BC and CD. A is a fixed end constraint, and D is a fixed hinge support. A horizontal rope is tied to the pin of the hinge B. The rope is hoisted with a weight W around the pulley. The size and position are as shown in the figure, and known ,，，. What is the reaction force at A and the force of pin B on the AB rod? (The direction of the force component is positive when along the x and y axis, and the moment of the couple is positive in the counterclockwise direction)

Question 5
The reaction force FAy is (   ) kN

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