1. The problem statement, all variables and given/known data A girl pushes on a large stone sphere. The sphere has a mass of 8200 kg and a radius of 90 cm and floats with nearly zero friction on a thin layer of pressurized water. Suppose that she pushes on the sphere tangent to its surface with a steady force of F = 45N and that the pressured water provides a frictionless support. How long will it take her to rotate the sphere one time, starting from rest? m = 8200kg r = 90cm = 0.90m Fapplied = 45N 2. Relevant equations τ = RF_perpendicular α = τ/I I = 2/5MR2 θ = ω0t + 1/2αt2 θ = 2∏r 3. The attempt at a solution Solve for τ = (45N)(0.90m) = 40.5 N*m Solve for α = 40.5N*m/[2/5(8200kg)(0.90m)2] = 0.01524 rad/s2 Solve for θ = 2∏(0.90m) = 5.65486 rad Solve for t: 5.65486 rad = 0 + 1/2(0.01524 rad/s2)(t2) t = 27.24 s The answer isn't right when I submitted it; I thought my process was correct. Where did I go wrong here? Thanks!