Final answer:
The magnitude of tension 3t3 in the traffic light is equal to the weight of the traffic light.
Step-by-step explanation:
In order to determine the magnitude of tension 3t3 in the traffic light, we need to analyze the forces acting on the light. The tension in each wire can be found by resolving the forces into their horizontal and vertical components. Since the horizontal components of the tensions cancel out, the vertical components must equal the weight of the traffic light. Therefore, the magnitude of tension 3t3 is equal to the weight of the traffic light.