일반물리학 1 — Motion in Two and Three Dimensions: Problem 61

61 When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of about $20\text{ km}$ (about the size of the San Francisco area). If a neutron star rotates once every second, (a) what is the speed of a particle on the star’s equator and (b) what is the magnitude of the particle’s centripetal acceleration? (c) If the neutron star rotates faster, do the answers to (a) and (b) increase, decrease, or remain the same?