of the wire21. If 1 cm' of cast iron weighs 21 g, find the weight of a cast32. The disteaihereof length 1 m with a bore of 3 cm in which the thicknes of tn pi14 cm long, is 88 cand outer radii o11, A rectangular shPipis I em.

of the wire21. If 1 cm' of cast iron weighs 21 g, find the weight of a

1.	of the wire21. If 1 cm' of cast iron weighs 21 g, find the weight of a cast32. The disteaihereof length 1 m with a bore of 3 cm in which the thicknes of tn pi14 cm long, is 88 cand outer radii o11, A rectangular shPipis I em.
Answer» External radius = 2.5 cm,length = 100 cm∴ External volume = [π x (2.25)2x 100] cm2internal radius = 1.5 cm∴ internal volume = [π x (1.5)2x 100]cm3Volume of metal= [π x (2.5)2x 100 - π x (1.5)2x 100] cm3= π x 100 x [(2.5)2- (1.5)2] cm3= (22/7 x 100 x 4 x 1 x 21/1000) kg= 26.4 kg.