identify which would experience a greater change in length, an aluminum rod of lenght 4m that is raised from 5 centimeters to 40 centimeters or an iron rod original lenght 3.5m that is raised from 10 centimeters to 35 centimeters
Huh? Surely this is not a problem you copied in "college".
I am wondering if you meant Celcius rather than centimeters. Surely not.