In the days before compact discs and MP3 players (ancient history!), music was recorded in scratches in the surface of vinyl-coated disks called records. In a typical record player, the record rotated with a period of 3.6 s. Find the centripetal acceleration of a point on the edge of the record. Assume a radius of 8.89 cm. So I already converted the radius to meters and got .0889m. Now I need to find the velocity in order to plug it into the equation for centripetal acceleration which is Ac=v^2/r... How should I go about solving for the velocity so I can get the centripetal acceleration??