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4. There is a rectangular panel of uniform density that is supported by two wires (BD and EC) and a ball and socket joint (3D pin) at A. The panel weighs 50 lbs. The system is in static equilibrium. What are the support reactions at A? What is the tension in the wires BD and EC? (15 pts.) Z D 2 ft 8 ft 4 ft C 3 ft E X B 6 ft y 2 ft 5 ft