1. The problem statement, all variables and given/known data How many revolutions per minute would a 15m diameter Ferris wheel need to make for a person to feel 'weightless' at the topmost point? 2. Relevant equations F= mv~2/r - mg v = 2pi r/ T 3. The attempt at a solution I get 8.57 m/s using the equation F= mv~2/r - mg I think I need to use v = 2pi r/ T to figure out T. If I do this, I get T=5.49. I have no idea if this is right. If it is, then I'm not sure what 5.49 represents and how to turn it into rev/minute. The answer is supposed to be 11 rev/min.