1. The problem statement, all variables and given/known data Find the magnitude F of the force that the man must pull up on the rope, in order to support himself and the platform at a xed position in mid-air (the rope is attached to a ceiling above the man). Solve for F for a man of arbitrary mass M, and a platform of arbitrary mass m (which includes the mass of the pulley). 2. Relevant equations F=ma 3. The attempt at a solution Obviously we should use F=ma and plug tension and normal force somewhere, I have no idea what and where to plug it in though, help!