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In the moment of inertia formula, r is the distance from the axis that is:

AParallel to it
BDiagonal to it
CTangential to it
DPerpendicular
Answer & Solution
Correct answer: D. Perpendicular
1. Each point of the body contributes its mass times r squared. 2. The r is measured straight out from the axis. 3. So it is the perpendicular distance from the axis. _Source: syllabus Physics Part I, Chapter 7, Systems of Particles and Rotational Motion._
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