Question

A metal rod is 80.000cm long at 20.0 degrees Celsius and 80.024cm long at 40 degrees Celsius. from these data calculate the average coefficient of linear expansion of the rod for this temperature range.

Answer 1

Use the formula
\[\Delta L= \alpha L _{0} \Delta T\]
delta L = L-L0.
alpha is the coefficient of linear expansion.
L0 is the original length of the rode.
delta T = T final - T initial.

Answer 2

and use SI units