1. The problem statement, all variables and given/known data What must be the period of rotation of a spatial station so that artificial gravity in a cabin that is 45 m of radius from the axis of ration corresponds to gravitational field at the surface of Earth ? 2. Relevant equations T=(2(pi)r)/v Sum of forces r prime = (mv^2)/r 3. The attempt at a solution I think that I have the following two forces : normal and gravitational force. so : n+mg=(mv^2)/r After that I don't know what to do. The situation is btw a circle.