Occasionally, a rotating neutron star (see Exercise 10.39) undergoes a sudden and unexpected speedup called a glitch. One explanation is that a glitch occurs when the crust of the neutron star settles slightly, decreasing the moment of inertia about the rotation axis. A neutron star with angular speed underwent such a glitch in October 1975 that increased its angular speed to , where .
A.) If the radius of the neutron star before the glitch was 11 , by how much did its radius decrease in the starquake? Assume that the neutron star is a uniform sphere.