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Answer: D. Laminar

Answer: (d) Laminar

The perpendicular axes theorem \(I_z = I_x + I_y\) holds only for a plane (laminar) body, whose mass lies entirely in the \(x\)–\(y\) plane, because it uses \(r^2 = x^2 + y^2\) for every particle. It cannot be used for three-dimensional bodies such as spheres, cones or cylinders.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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