Determine the tension developed in the cable ab required to support the traffic light, which has a mass of 19 kg . take h = 3.5 m.

Only two forces acts on the traffic light: the tension T of the cable (upward) and the weight of the traffic light (downward). The weight is

If the traffic light is at equilibrium, the resultant of the two forces must be equal to zero (Netwon's second law):

Therefore the tension of the cable is

The rearrangement of particles in a physical change. hope this