Question

a rectangular hollow pipe is made of 1 cm thick iron sheet if the length of the pipe is 2 metre and the other outer dimensions of the pipe are 10 cm into 8 cm then find the weight of the pipe if 80cm cube of iron weighs 1 kg help fast

Answer 1

In this type of question, we need to subtract external radius and internal radius to get the answer using the volume formula as the pipe is hollow. Oh! line become a bit complicated, sorry for that, lets solve it.

External radius = 5 cm
Internal radius = 3 cm [because thickness of pipe is 1 cm]

Volume of iron =πr2h
= 22/7∗[5^2−3^2]∗2m^3
= 22/7* [25 - 9 ] *2m^3
= 22/7* [16 ]* 2m^3 
= 100 571.42 ^3 

WEIGHT OF IRON - 100 571.42 * 10 


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