1. The problem statement, all variables and given/known data http://docs.google.com/Doc?id=d277r7r_58d3chgqfj 2. Relevant equations a=w^2*r 3. The attempt at a solution a=w^2*r w^2*r*cos(theta)=-mg theta=arcos(-mg/(Rw^2)) I'm pretty sure that's right, because the vertical component of the acceleration has to equal the vertical component due to gravity. However, I wasn't sure if acceleration was simply w^2*R or if I had to do something more complicated to find it. Is my reasoning/answer correct?