Consider the low RPM case as shown below, where the driven pulley is centered about point A and has a radius of 25 cm and frictional coefficient of friction μ. Let ϕ = 30∘ and θ = 15∘. If the tension of the tensed segment, T, of the belt is 1500 N, find the minimum value of μ required for the tension on the slacked segment, S, of the belt does not fall below 500 N.