Suppose a 1 meter long bar expands 0.5 centimeters when heated. by how much will a 100 meter long bar of the same material expand when similarly heated?

50 cm

Explanation:

Let the increase i  temperature of the metal rod is ΔT and the coefficient of linear expansion of the material of metal rod be ∝.

By use of the formula of linear expansion,

   .... (1)

Let the expansion in length of rod is ΔL.

So,

   .... (2)

Dividing equation (2) by equation (1), we get  

ΔL = 0.5 m = 50 cm

you go to your settings preference and in the end youll see sth that says "i want to delete my acc" click on it and u'll acc will be deleted but u have to wait.