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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 8g/cu.cm, then the weight of the pipe is
A. 3.6 kg
B. 36 kg
C. 3.696 kg
Feedback External radius = 4 cm
Internal radius = 3 cm
Volume of iron = [22/7×(4^2−3^2)×21]cm^3= 462cm^3
Weight of iron = (462 x 8)gm = 3696 gm = 3.696 kg
Internal radius = 3 cm
Volume of iron = [22/7×(4^2−3^2)×21]cm^3= 462cm^3
Weight of iron = (462 x 8)gm = 3696 gm = 3.696 kg
D. 36.9 kg
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