Consider the diatomic molecule oxygen o2 which is rotating in the xy plane about the z axis passing through its center, perpendicular to its length. the mass of each oxygen atom is 2.66 × 10^(-26) kg, and at room temperature, the average separation distance between the two oxygen atoms is 1.49 × 10^(-10) m (treat the atoms as point masses). if the angular speed of the molecule about the z axis is 4 × 10^(12) rad/s, what is its rotational kinetic energy? answer in units of j