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28. Derive an expression for the rotational inertia of the four balls shown in Figure P9.28 about an axis perpendicular to the paper and

28. Derive an expression for the rotational inertia of the four balls shown in Figure P9.28 about an axis perpendicular to the paper and passing through point A. The mass of each ball is m. Ignore the mass of the rods to which the balls are attached. Figure P9.28 B A 1 C

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