Question

when heated an iron bar expands by 0.4%. if the increase in length is 2cm. what is the original length of the bar?

Answer 1

Answer:

let the length of the bar be 100cm, then on heating it expands 0.4 cm or increase in length = 0.4cm

So if the increase in length is 4cm then the original length is 1000 cm

So if the increase in length is 2cm, then original length is 500cm Ans