posted by fei on .
a traffic light is supported by a cable that makes ang angle of 7 degree w/ the horizontal on each side of weight. what is the maximum safe weight of the light if the maximum safe tension in the cable 1200N
Draw a free body diagram. Apply a vertical force balance. If the cable is at the breaking point tension,
2*1200*sin7 = M*g
Solve for M, in kg
M = 30 kg