1. The problem statement, all variables and given/known data Two small planets are moving in circular orbits around the same star. If the radius of the orbit of planet A is 4 times the radius of the orbit of planet B, find the ratio of their speeds vA/vB. 2. Relevant equations Not really sure but v=omega*r a(centripetal)=v^2/r UCM T=2*pi*r/v 3. The attempt at a solution I honestly have no idea how to do this problem. I know the answer is .5 I just want to know how to get there!