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Q.
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.
3.696 kg
C.
36 kg
D.
36.9 kg
View Answer
Correct choice: B
Explanation:
External radius = 4 cm Internal radius = 3 cm Volume of iron = [22/7×(42−32)×21]cm3= 462cm3 Weight of iron = (462 x 8)gm = 3696 gm = 3.696 kg
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