Question

An iron rail is 20cm² in area. how much will it expand when heated from 100∅ to 50∅​

Answer 1

0.024

Step-by-step explanation:

no expansivity ok but I can do it

linear expansivity=1.2*10^-5

=2a

=2*1.2*20^-5

=2.4*10^-5

∆A =?

A1 =20

2.4*10^-5 =∆A/A1(100-50)

∆A =2.4*10^-5*1000

=0.024