Thermal Expansion: Find % Change in Density & Metal ID

[Pinkythermo]

Homework Statement

When the temperature of a metal cylinder is raised from 0 degrees C to 100 C,its length increases by 0.23%.

(a) Find the percent change in density.
(b) What is the metal?

Homework Equations

∇L = Lα∇T

The Attempt at a Solution

 

[Pinkythermo]

please do help sum1