Question

An iron pipe is 21 m long and its exterior diameter is 8 cm. If the thickness of the
pipe is 1 cm and iron weight is 8 g/cm3, find the weight of pipe.​

Answer 1

Answer:

exterior diameter=8cm

radius=d/2

=8/2

=4cm

let us take exteror radius as R

thickness=1cm

iterior radius=exteriror(outer) radius-thickness

                   =4-1

                    =3cm(let inner radius be r

volume of pipe (which is hollow)=π(R squrae-r squrae)*height

                                                  =22/7(4 squrae-3 squrae)*2100

                                                   =22/7(16-9)*2100

                                                    =22/7*7*2100

                                                    =46200cubic cm

weight = 46200*8

          =369600gram

           =369.6kilogram

Step-by-step explanation: