Posted by can't understand the question...help!!! on Sunday, April 10, 2011 at 12:59pm.
I wish I understand what you think you dont know.
the door has a center of gravity.
You can label each hing with a horizontal force, and a vertical force.
Then, write three equations
Sum of horizontal forces=0
sum of vertical forces=0
sum of moments about any point is zero
so with those equations, you get the forces on each hings. All it is looking for is horizontal force (note: the two hinges will be equal and opposite horizontal forces.
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