volume and surface area

gabbar asked Oct 28, 2017 • retagged Dec 12, 2017 by Arjun

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a hollow iron pipe is 21cm long and its external diameter is 8cm. if the thickness of the pipe is 1 cm and iron weigth is 8 g/cm3 then the weigth of the pipe is?

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gabbar asked Oct 28, 2017 • retagged Dec 12, 2017 by Arjun

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Mass = Density * Volume of the hollow cylinder

= 8 * pi * h * (r₂² - r₁²)

= 8 * (22/7) * 21 (4² - 3²) [ As outer diameter = 8 cm so radius = 4 cm and as thickness of pipe = 1 cm so inner radius = 3 cm ]

= 8 * 22 * 3 * 7

= 3.696 kg

Habibkhan answered Oct 28, 2017

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