1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution I only know how to do this with the coefficient of friction, and since there is no friction here I don't know how to do it. Normally the equation is = Fstatic friction max = v^2/r mu * g * r = v^2 and then finally root(mu*g*r) = v What do I do if I don't have mu?