Question

Plz solve this my boards are coming

Iron Pipe is 21m long and its exterior diameter is 8cm and thickness is 1cm. iron weight is 8gm/cm3
Find weight of the pipe​

Answer 1

Step-by-step explanation:

lenght=21m=21*100=2100cm which is height (* means multiplied)

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

Answer 2

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