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- A hollow iron pipe is 21 cm long and its external diameter is 8 cm.
Question 1:
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:
A. 3.6 kg
B. 3.696 kg
Feedback External radius = 4 cm,
Internal radius = 3 cm.
Volume of iron
=22/7x [(4)2 - (3)2] x 21cm3
=22/7x 7 x 1 x 21cm3
= 462 cm3.
Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.
Internal radius = 3 cm.
Volume of iron
=22/7x [(4)2 - (3)2] x 21cm3
=22/7x 7 x 1 x 21cm3
= 462 cm3.
Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.
C. 36 kg
D. 36.9 kg
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