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## Homework Statement

A 50 kg traffic light is suspended above an intersection by a continuous steel cable. The cable has a diameter of 1.0 cm, and the light is depressed 12 degrees below the horizontal. What is the percentage increase in the length of the cable due to the mass of the traffic light?

## Homework Equations

Stress=Force/Area

Strain=Change in length/original length

Young's elastic modulus(E)=Stress/Strain

Area = (pi) x (r^2)

E for steel is 200 x 10^9

## The Attempt at a Solution

Well I found the stress and strain, but now I am lost.