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The number of a particle does affect the moment of inertia. A composite body is consisted of __________ number of particles.

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The number of a particle does affect the moment of inertia. A composite body is consisted of __________ number of particles.

(a) Infinite

(b) Finite

(c) Hundreds

(d) Thousands

I got this question in unit test.

This is a very interesting question from Moment of Inertia for Composite Areas in division Moments of Inertia of Engineering Mechanics

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The correct answer is (a) Infinite

The explanation is: The various bodies are composed of an infinite number of particles. They are very small in size. They can’t be seen by our naked eyes. Thus the number of particles is not thousands nor hundreds. But it is uncountable.

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