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Standard IX

Mathematics

Volume of a cuboid

A iron pipe i...

Question

A iron pipe is 21 m long and its exterior diameter is 8cm.If the thickness of the pipe is 1cm and iron weight 8g/cm³,find the weight of pipe?

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Solution

Given: External diameter = 8 cm
Then
External radius = 4 cm,
Internal radius = 4-1=3 cm.
âˆ´Volume of iron = {(22/7)* [(4)² - (3)²] x 21} cm³= {(22/7)71*21} cm³ = 462 cm³
â‡’Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.

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A iron pipe is 21 m long and its exterior diameter is 8cm.If the thickness of the pipe is 1cm and iron weight 8g/cm3,find the weight of pipe?

Given: External diameter = 8 cmThenExternal radius = 4 cm,Internal radius = 4-1=3 cm.âˆ´Volume of iron = {(22/7)* [(4)2 - (3)2] x 21} cm3= {(22/7)*7*1*21} cm3 = 462 cm3â‡’Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.

A iron pipe is 21 m long and its exterior diameter is 8cm.If the thickness of the pipe is 1cm and iron weight 8g/cm³,find the weight of pipe?

Given: External diameter = 8 cm
Then
External radius = 4 cm,
Internal radius = 4-1=3 cm.
âˆ´Volume of iron = {(22/7)* [(4)² - (3)²] x 21} cm³= {(22/7)71*21} cm³ = 462 cm³
â‡’Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.