Hollow Cylinder (Pipe) – Area and Mass Calculation
Hollow Cylinder (Pipe) – Area and Mass Calculation
Secondary 1
The diagram shows the cross section of a cylindrical pipe with radius \(5.6\) m. The shaded region shows the thickness of the pipe, which is \(2.8\) m.
- Find the area of the shaded region.
- The density of the material used to make the pipe is \(40\) kg/m\({^3}\), find the mass of the \(30\) m pipe. Give your answer correct to \(3\) significant figures.
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Answer:(a) \(73.9\text{ m}^2\) (3 s.f.) (b) \(88\,700\text{ kg}\) (3 s.f.)
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