A cylindrical tube open at both ends is made of metal. The internal d…

Question

A cylindrical tube open at both ends is made of metal. The internal diameter of the tube is 11.2 cm and its length is 21 cm. The metal everywhere is 0.4 cm thick. The volume of the metal is :

Accepted Answer

Option B. 306.24 cm 3. Answer & Solution Answer: Option B Solution: Internal radius : & = ( 11.22 )cm & = 5.6\,cm External radius : & = ( 5.6 + 0.4 )cm & = 6\,cm Volume of metal : & = [ 227 × \ ( 6 )^2 - ( 5.6 )^2 \ × 21 ]cm^3 & = ( 66 × 11.6 × 0.4 )cm^3 & = 306.24\,cm^3