Question

2. The coefficient of linear expansion of steel is 12 X 10° K'. What is the change in length of a 25-m steel bridge span when it undergoes a temperature of 40 K? 2. The

Answer 1

Sol. :- We are given coefficient of linear expansion of steel (a) = 12$\times$$10^-^6$ K^-1

And length of steel Bar (l) = 25 m

Change in temperature  $\bigtriangleup T$ = 40

So, change in lenght of Bar = al$\bigtriangleup T$ = 12$\times 10^-^6 \times 25\times 40$ = 0.012m or 1.2 cm

Hope this helps........