Simple strain gauge in rectifier, last part of the problem

[adamaero]

Homework Statement

Homework Equations

The Attempt at a Solution

I do not understand this last part:

Is this needed? The divide by two is the voltage divider, correct?

 

[scottdave]

If you plug in 1450 x 10^-6 for ΔL/L into the last equation, you do not get the same ΔV as you first figured. Where did you get these formulas? Do you have the circuit diagram. I know these are pretty standard, but it might help

 

[adamaero]

first figured

I guess that's why I don't understand whoever wrote this.

Where did you get these formulas? Do you have the circuit diagram.

Our professor gave us a solution since the assignment isn't collected. (Among the 50 or so problems, I haven't found errors--but some of the problems are not from our book, and several solution's equations are not in the book or lecture.)
Sorry: