A star rotates with a period of 30 days about an axis during its center. The period is the time it takes a point on the star's equator to make one complete revolution around the axis of rotation. After the star undergoes a supernova explosion, the stellar core, which had a radius of 1.0 x 10^4 Km collapses into a neutron star of radius 3.0 Km. what is the new period of rotation of the star?