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July 28, 2015

Homework Help: Physics

Posted by Julia on Wednesday, April 27, 2011 at 12:19pm.

A trap door, of length and width 1.65 m, is held open at an angle of 65.0 degrees with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly to the trap door. If the mass of the trap door is 16.8 kg, what is the torque exerted on the trap door by the rope?
I've seen several incorrect answers to this exact question when I searched online. I thought I would provide the correct general method on how to do this problem and give you the answer you should get if it is done correctly. (see below for method)

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