IN problems involving mechanics and engineering, determination of moment of inertia, product of inertia and second moment of area is a common procedure. But, frequently, it is by no means an easy one. For example, when considering the moment of inertia of the triangle or figures built up from the triangle, the mathematics involving calculus and several inertia theorems, can be difficult in manipulation.
Brailsford, G.R. (1951), "Replacement of Masses and Areas by Equivalent Particles: A Simplified Method for Engineers of Determining such Characteristics as Moment and Product of Inertia", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 11, pp. 330-333. https://doi.org/10.1108/eb032098
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