Please explain in detail

1) Three people are standing on a horizontally rotating platform in an amusement park. One person is almost at the edge, the second one is ('s)R from the center, and the third is (% )R from the center. Compare (a) their periods of rotation, (b) their speeds, and (c) their radial accelerations. 2) You are working in a biology lab and learning to use a new ultracentrifuge for blood tests. The specifications for the centrifuge say that a red blood cell rotating in the ultracentrifuge moves at 470 m/s and has a radial acceleration of 150,000 g's (150,000 times the freefall acceleration of 9.8 m/s2). The radius of the centrifuge is 0.15 m. You wonder if this claim is correct. Support your answer with a calculation