If the iron core of a dying star initially spins with a rotation frequency of ?0 = 3.20 rad/s, and if the core’s radius decreases during the collapse by a factor of 22.7, what is the angular velocity of the iron core at the end of the collapse, (assuming that the iron core is a uniform sphere before collapse and is a uniform sphere after collapse)? Use the fact that the rotational inertia of a rotating sphere is given by: