일반물리학 1 — Rotation: Problem 38

38 Figure 10-25 shows three 0.0100 kg particles that have been glued to a rod of length L = 8.00 cm and negligible mass. The assembly can rotate around a perpendicular axis through point O at the left end. If we remove one particle (that is, 33% of the mass), by what percentage does the rotational inertia of the assembly around the rotation axis decrease when that removed particle is (a) the innermost one and (b) the outermost one?