Find the weight of a lead pipe 3.5m long, if the external diameter of the pipe is 2.4cm and the thickness of the lead is 2mm and 1 cubic cm of lead weighs 11 gm.

Explanation

External diameter, `D=2.4cm`

So, External radius, `R=1.2cm`

Thickness = `2mm` = `2/10`

Thickness = `0.2dm`

Now, Inner radius(r) = `1.2=0.2`

`r=1cm`

`height, `h=3.5cm` = `350cm`

Volume of hollow cylinders = `pih(R^2=r^2)`

...