Door and a string
There is a door. A person standing at point P pulls a string with a constant 10 Newton force towards him. The force is always directed towards the point P. The door is initially at rest. What the the angular velocity of the door (in rad/s) after the door is vertical (aligned with the dashed blue line. It is hinged at point O. It has a length of 1.2 meters and a mass of 10 kg. All other values are on the diagram.
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The answer is 20.72964897.
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