Question
If 1 cubic cm of cast iron weights 21 gms , then find the weight 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 .
Answer: Option C
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Inner radius = `(3/2)` cm = 1.5 cm.
Outer radius = (1.5 + 1) = 2.5 cm
`:.` Volume of iron = `[ pi xx (2.5)^2 xx 100 - pi xx (1.5)^2 xx 100] cm^3`
= `22/7 xx 100 xx (2.5)^2 - (1.5)^2] cm^3`
= `(8800/7 ) cm^3`
`:.` Weight of the pipe = `(8800/7 xx 21/1000 )` kg = 26.4 kg.
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