1. The problem statement, all variables and given/known data One end of a rope is fixed to a vertical wall and the other end pulled by a horizontal force of 20N. The shape of the flexible rope is shown in the figure. Find its mass. 2. Relevant equations http://www.luiseduardo.com.br/mechanics/static/staticproblems_arquivos/image017.jpg [Broken] 3. The attempt at a solution Let the wall exert a force F in the tangential direction at the point where rope is fixed. Let the tangent make an angle θ with vertical. Fcosθ=mg Fsinθ=20 cotθ= mg/20 But θ is still unknown!