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If 1 cubic cm of cast iron weighs 21 gms, then find the eight of a cast iron pipe of length 1 metre with a bore of 3 cm and in which thickness of the metal is 1 cm. |
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Answer» Inner radius = (3/2) cm = 1.5 cm, Outer radius = (1.5 + 1) = 2.5 cm. Volume of iron = [π x (2.5)2 x 100 - π x (1.5)2 x 100] cm3 = (22/7) x 100 x [(2.5)2 - (1.5)2 ] cm3 = (8800/7) cm3 Weight of the pipe = ((8800/7) x (21/1000))kg = 26.4 kg. |
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