As the bar of aluminum is heated, you know the length of the bar increases according to
T = =
100oC - 23oC = 77 Co
L
= ( 24 x 10 - 6 (Co) - 1 ) (0.80 m)
( 77 Co)
L
= 1.48 x 10 - 3 m
L
= 1.48 mm
(c) 2002, Doug Davis; all rights reserved.