physics
posted by suhani .
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 every where is 0.4 cm thick. Calculate the volume of the metal correct to 1 place of decimal

Outer Dia. = 11.2 + 2*0.4 = 12 cm.
V = pi*r^2 * h.
V = 3.14*6^2 * 21 = 2373.8 cm^3.