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

We know that,
`R=d/2​=2.4/2=1.2cm`
External Radius `(R)=1.2cm`
Thickness`=2mm=0.2cm`
Inner Radius `(r)=1.2−0.2=1cm`
Height `(h) =3.5cm=350cm`
Volume of hollow cylinders `=pi(R^2−r^2)`
`=22/7xx(1.2^2-1^2)xx350`
`=22/7xx(1.44−1)xx350`
`=22xx0.44xx50`
`=22xx44/100xx50`
`=484cm^3`
Weight of `1cm^3=11`g
Weight of `484cm^3
=484×11=5324`g
`:.` The weight`=5324`g.