What length of a solid cylinder 2 centimetre in diameter must be taken to recast into a hollow cylinder of length 16 centimetres external diameter 20 cm and thickness 2.5 mm
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Length of cylinder =h
For solid cylinder
D=2
R=1
H=?
For hollow cylinder
d=20
r=10
Thickness=2.5
R=10+2.5=12.5
Vol of solid cylinder= vol of hollow cylinder
πr^2h=π(R^2-r^2)h
(1^2)h=(12.5^2-10^2)16
h=(156.25-100)16
h=900
For solid cylinder
D=2
R=1
H=?
For hollow cylinder
d=20
r=10
Thickness=2.5
R=10+2.5=12.5
Vol of solid cylinder= vol of hollow cylinder
πr^2h=π(R^2-r^2)h
(1^2)h=(12.5^2-10^2)16
h=(156.25-100)16
h=900
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