1. The problem statement, all variables and given/known data http://imgur.com/Frn6v 2. Relevant equations Ac=((2pi*r/T)^2)/r Where T is the time period 3. The attempt at a solution Since a g is 9.8m/s^2 20(9.8)=(4*pi^2*29)/T^2 1144.87/(20(9.8))=5.841 And solved for T getting... sqrt(5.841)=2.417 The book's answer at the back reads 0.749 revs/sec. Did I miss something or is there something else I'm supposed to do with the answer? Thank you for your time.