Hi, how can I determine the tangental acceleration of a circle needed to produce a given centripetal acceleration from a range of radii? For example, I would like to produce 9.81 m/s/s centripetal acceleration with a range of radii from 5km to 100km? All I really need is to figure out the equation and I can write a program to graphically display the results. Here's what I've found so far: If centripetal force is different than centripetal acceleration and a weight is needing to determine the newtons involved then assume that the object being acted upon weighs 80 earth kg. Thanks for any help! If you could just nudge me in the right direction I'd appreciate it very much.