Rpm Rims What Angular Speed (in Rpm) Must The Platform Have To Give A Centripetal Acceleration Of 5.1 G At The Rim?

What angular speed (in rpm) must the platform have to give a centripetal acceleration of 5.1 g at the rim? - rpm rims

One way NASA is investigating the possibility of providing space for the astronauts during flights of long duration with exercise and the "gravity", while man-powered centrifuge. This device is essentially a circular platform on which two astronauts rotating in a prone position on a diameter of head to the middle with his feet on the opposite side of the head. The radius of the platform is 6.25ft.