a window with a smooth hinge at the top is held open at an angle 30 degrees to the vertical by a horizontal force applied to the center of it lower edge. the force of gravity on the window is 3kgf acting through its mid point. draw a scale diagram of the arrangement and indicate on it a triangle of forces by the letter A B C. hence either by measurement or calculation.find the magnitude of the force exerted by its hinge.
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