Tons of dust and small particles rain down onto the Earth from space every day. As a result, does the Earth’s moment of inertia increase, decrease, or stay the same? (b) Choose the best explanation from among the following:
I. The dust adds mass to the Earth and increases its radius slightly.
II. As the dust moves closer to the axis of rotation, the moment of inertia decreases.
III. The moment of inertia is a conserved quantity and cannot change.
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