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
FeedbackExternal radius = 4 cm, Internal radius = 3 cm. Volume of iron =22/7 x [(4)^2 - (3)^2] x 21Cu.cm =22/7x 7 x 1 x 21Cu.cm = 462 Cu.cm Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg
C.36 kg
D.36.9 kg
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