Question
What length of a solid cylinder 2cm in diameter must be taken to recast into hollow cylinder of length 16cm,external diameter 2cm and thickness 2.5mm?
Answers
for the hollow cylinder,
outside volume is pi * 1^2 * 16 = 16pi
inside volume = pi * (1-.25)^2 * 16 = 9pi
volume of metal = 7pi cm^3
volume of solid is thus
7pi = pi * 1^2 * h = h*pi
h = 7 cm
outside volume is pi * 1^2 * 16 = 16pi
inside volume = pi * (1-.25)^2 * 16 = 9pi
volume of metal = 7pi cm^3
volume of solid is thus
7pi = pi * 1^2 * h = h*pi
h = 7 cm
What length of solid cylinder 2 cm in diameter must be taken to recast into a hollow cylinder of length 16 cm x 10 external diameter 20 cm and thickness 2.5 mm
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