An iron pipe is 21 cm long and its external diameter is 8cm .if the thickness of the pipe is 1cm and iron weight 10gm per cm3. Find the weight of the pipe
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h =21cm ; R = 4cm t = 1cm ; r = 4 -- 1= 3cm
V =Pi (R^2 -- r^2)h
= (22÷7)(R+r) (R -- r) × h
=(22÷7)(4+3)(4 -- 3) ×21
=462cu.cm
weight = 462×10=4620g =4.6Kg
V =Pi (R^2 -- r^2)h
= (22÷7)(R+r) (R -- r) × h
=(22÷7)(4+3)(4 -- 3) ×21
=462cu.cm
weight = 462×10=4620g =4.6Kg
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