Question
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.
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.
Answer: Option B
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Inner radius = (3/2) cm = 1.5 cm
Outer radius = (1.5 + 1) = 2.5 cm
Volume of iron = [22/7 x (2.5)2 x 100 - 22/7 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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