Question

The length of an aluminium bar of lenght 80 cm increases by 1 mm on heating.What is the final temperature of the bar if it was initially at temperature 20 °C?(Given:Coefficient of linear expansion of alnmonium=25×10_6/°c)

Answer 1

By applying this law

Change in length=coefficient of linear expansion*inital length*change in temprature

First we will calculate the change in temprature

Change in temprature=10^-3/25*10^-6*0.8=50C

Since the length increased then the temprature increased

So the final temprature =20+50=70C