Question

An iron pipe is 21 m long and it's exterior diameter is 8 cm if the thickness of pipe is 1 cm and iron weight is 8g/cubic cm find the weight of pipe

Answer 1

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

Answer:

Answer of chapter mesuration