Question

an iron pipe is 21 m long and its exterior diameter is 8 centimetre if the thickness of the pipe is 1 cm and iron weight is 8 gram / centimetre cube find the weight of the pipe​

Answer 1

Answer:

Step-by-step explanation:

Vol=22/7h(R^2-r^2)

=22/7×21×4^2-3^2

=462

Weight=8×462=3.696 kg

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Answer 2

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!