A uniform bar has two small balls glued to its ends. The bar is 2.00 m long and has mass 4.00 kg, while the balls each have mass 0.500 kg and can be treated as point masses. Find the moment of inertia of this combination about each of the following axes:
(a) An axis perpendicular to the bar through its center;
(b) An axis perpendicular to the bar through one of the balls;
(c) An axis parallel to the bar through both balls;
(d) An axis parallel to the bar and 0.500 m from it.