a hollow iron pipe is 5m long. its extrenal diameter is 20cm and it is 1.5cm thick. calculate the weight of the pipe if iron weight is 8.2 gm/cm3
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Answer:
External radius = 4 cm,
Internal radius = 3 cm.
Volume of iron
= 22 x [(4)2 - (3)2] x 21 cm3
7
= 22 x 7 x 1 x 21 cm3
7
= 462 cm3.
Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.
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