- #1

Girn261

## Homework Statement

Please see the uploaded picture, need help understanding a few things. First off, If you look at the equation Strain(c)/E(c)+Strain(s)/E(s) = Ac(delta T) - As(Delta T)

and below that they wrote

2x Stress(s)/100x10^9 + Stress(s)/210x10^9

My question is, how did they go from the top part of the equation, to the bottom? Strain is gone and stress magically appeared. also if you look at the picture I uploaded, the 100x10^9 magically disappears and also they somehow get 5xStress(s)

I wish I had someone to ask for help, but I am stuck and I'm not in school and my co-workers are not very helpful.

## Homework Equations

Stress=P/area , Strain = coeff. of linear expansion x delta T , modulus of elasticity = stress / strain