PDF chapter test TRY NOW

Answer the following.
  
1. A Solid has a area A1 at temperature T1. The temperature is increased to T2. If βis the coefficient of superficial expansion, the increase in area is given by ___________.
 
 
2. Some iron has a coefficient of linear expansion of 11×10−6K−1. A 50\(mm\) length of iron piping is heated through 20\(K\). The pipe extends by  .