Question

a steel beam is 10m long at 10 degrees. By how much does it contract of the temperature drops to -10 degrees?

Answer 1

When an object is heated or cooled, its length changed by an amount proportional to its original length and the change in temperature. The change in length is can be expressed as, de = loa (ti-to) where to initial length of the object to, ty are initial & final temperatures respectively. Here, Lo-10m a thermal expansion coefficient Here, & of sted = 7.2x10 6 ce temperature change = 10 - (-10) = 20° ... The amount of contraction, = 108 7. 2X10 x 20 m = 1.44810 m = 1.44 mm