posted by kelly on .
A trapdoor on a stage has a mass of 20.8 kg and a width of 1.51 m (hinge side to handle side). The door can be treated as having uniform thickness and density. A small handle on the door is 1.41 m away from the hinge side. A rope is tied to the handle and used to raise the door. At one instant, the rope is horizontal, and the trapdoor has been partly opened so that the handle is 1.13 m above the floor. What is the tension, T, in the rope at this time?
torque= m* g * l/2 cos theta - T R sin theta = 0
Tension= mg l/2 tan theta/ 2 R
I keep getting something wrong if i used this ....please help