Hello, I know that there are two possible formulas to solve for radius. You can use (mv^2)/r ,or, (m4pir^2)/T^2. Now, the question is asking when the radius is trippled, the Centripital force is....? Using the first equation, I come out with 1/3. Using the second equation, I come out with 9. That confuses me enough, but when I looked back on a quiz we had (sometimes I get solutions from quizs), I found that my teacher asked when radius is tripled, centripital acceleration is....? The answer was 3. Can anyone provide some insight into what I am doing wrong and what equation i should use to get my answer. Thank you in advance!!!