The thickness of a metallic tube is 1cm and the inner diameter of the tube is 12cm. Find the mass of `1m` long tube, if the density of the metal be `7.8gm//cm^3`

Explanation

Inner diameter of the tube`=12cm`
`r=`Inner radius of the tube`=6cm`
Thickness of the tube`=1cm`
`R=`Outer radius of the tube`=(6+1)cm=7cm`
`h=`Length of the tube`=1m=100cm`
Volume of the metal in the tube`=pi(R^2-r^2)h`
`=22/7xx(7^2-6^2)xx100 cm^3=22/7xx13xx100 cm^3`
Density of the metal`=7.8 gm//cm^3`
Weight of the tube`=`Volume`xx`Density
Weight of the tube`=22/7xx13xx100xx7.8 gm=31868.57gm`