The aircraft-hangar door opens and closes slowly by means of a motor which draws in the cable

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The aircraft-hangar door opens and closes slowly by means of a motor which draws in the cable AB. If the door is made in two sections (bi-fold) and each section has a uniform weight W and length L, determine the force in the cable as a function of the door's position θ. The sections are pin-connected at C and D and the bottom is attached to a roller that travels along the vertical track.


Dy Dx L/2 L/2 612 587L 2 L NA /2


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