Question

A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is:


Options:
A .  3.6 kg
B .  3.696 kg
C .  36 kg
D .  36.9 kg
Answer: Option B

External radius = 4 cm,

Internal radius = 3 cm.

Volume of iron = A Hollow Iron Pipe Is 21 Cm Long And Its External Diameter ... 22 x [(4)2 - (3)2] x 21 A Hollow Iron Pipe Is 21 Cm Long And Its External Diameter ...cm3 7 = A Hollow Iron Pipe Is 21 Cm Long And Its External Diameter ... 22 x 7 x 1 x 21 A Hollow Iron Pipe Is 21 Cm Long And Its External Diameter ...cm3 7 = 462 cm3.

A Hollow Iron Pipe Is 21 Cm Long And Its External Diameter ... Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.


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