1. The problem statement, all variables and given/known data A 10 kg plank leans against a frictionless wall and floor at an angle of 60 degrees with the horizontal. A horizontal rope connects the center of mass of this uniform plank with the wall. a- Use dynamics to find the normal force between the floor and the plank. b- Find the normal force between the wall and the plank. c- Determine the tension in the rope. d- Show the net torque is zero when the pivot is located where the plank meets the wall. 2. Relevant equations torque = Fsin(phi) radius 3. The attempt at a solution a- normal floor = weight = 10kg (9.8) = 98 N b- Using torque, I end up with -56.6. -torque of normal floor + torque of normal wall = 0 98 N (sin 210) length/2 = normal wall (sin 120) length /2 normal wall = -56.6 What am I doing wrong?