Final answer:
To calculate the force and moment reactions at the bolted base of the overhead traffic signal assembly, create a free-body diagram and apply Newton's second law.
Step-by-step explanation:
To calculate the force and moment reactions at the bolted base O of the overhead traffic signal assembly, we need to consider the forces acting on the system. The weight of each traffic signal is 36 kg, the mass of member OC is 50 kg, and the mass of member AC is 55 kg. The center of mass of member AC is at G.The force and moment reactions can be determined by creating a free-body diagram and applying Newton's second law. The horizontal components of the tensions in the wires must cancel out, and the sum of the vertical components of the tensions must equal the weight of the traffic light.