Question

an iron pipe is 21 m long it's and its exterior diameter is the thickness of the pipe is 1 cm and iron weight is 8 gram per centimetre cube find the weight of the pipe

Answer 1

Hello mate,

Exterior volume= 22/7 * 4 *4 *2100

                            = 105600 cm cube 

Interior diameter= 8-(1+1)

                              6 cm

Interior volume= 22/7*3*3*2100

                           =59400cm cube

Volume of pipe=105600-59400=46200cm cube

Hence, weight of pipe=46200*8

                                       =369600g or 369.6 kg

hope this helps you out!

Answer 2

⭐⭐ heya mate ⭐⭐

here is ur answer ➖➖➖➖➖➖➖⬇

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

hope it helps uhh......

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