Question

the outer diameter of a iron pipe is 14 cm and the thickness of the pipe is 1 cm .find the weight of 5m long tube if the density of the iron is 7gm /cm^3

Answer 1

So outer radius = 7 Cm

Inner radius = outer radius -thickness

= 7-1 = 6 Cm

Vol = pi *(R^2-r^2)*h

= 22/7*13*5

Density = mass / volume

Mass = 7*22/7*13*5

=1430 gm