1. The problem statement, all variables and given/known data I have found the question I am having trouble with here: http://www.chegg.com/homework-help/...se-height-incline-ish-50cm--coefficie-q218123 2. Relevant equations See below 3. The attempt at a solution After doing my free body diagram, I picked the vertical axis to be y and the horizontal axis to be r. Force total in the r direction= Fnsinθ-Ffrcosθ= m((v^2)/r) In the y direction, = Ffrsinθ + FnCosθ-mg=0, b/c a=0 If this box is not to be in motion, then the sum of these forces should be zero. I set the two equations = to zero, while solving for v, but it did not come out to the 1.8 that is given as a solution. Are my components at least correct? If so, where am I going wrong?