cylindrical tube open at both ends is made of metal. The internal diameter of the tube is 6.88 cm and its length is 1200 cm. Calculate the volume of the metal correct to the nearest cm³ if the metal is every where 2 mm thick.
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Answer:
Internal diameter = 11.2cm
Internal radius = 11.2/2=5.6cm
Length of the cube = 21cm
Volume of internal cylinder =πr
2
h
=22×5.6×5.6×
7
21
=2069.76cm
2
External radius = R=(5.6+0.4)
Volume of external cylinder = πR
2
h
22×6×6×
7
21
2376cm
2
volume of metal = volume of external diameter
volume of internal diameter
(2376−2069.76)
306.24cm
3
306.2cm
3
Step-by-step explanation:
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