800 lb The base of an automobile jack stand forms an equilateral triangle of side length 10 in. and is centered A under the collar A. Model the structure as one with a ball and socket at each joint and determine the forces in members BC, BD, and 16" CD. Neglect any horizontal reaction components under the feet B, C, and D. B D 10"

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Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.