1. The problem statement, all variables and given/known data A rope of mass m forming a circle is placed over a smooth round cone with half angle θ. Find the tension in the rope . 2. Relevant equations 3. The attempt at a solution Since the half angle is θ , the normal force N acts at an angle θ with the horizontal . The weight acts downwards. Assuming (since I am not sure ) that the tension T acts towards the center of the circle formed by the rope , doing the force balance , Ncosθ = T Nsinθ = mg So,tension T = mgcotθ . I don't have the answer key ,so is this the correct answer ? I somehow have the feeling that this is incorrect . Many thanks .