The base of an automobile jackstand forms an equilateral triangle of side length 13 in. and is centered under the collar A. Model the structure as one with a ball and socket at each joint and determine the force in members BC, BD, and CD. The forces are positive if in tension, negative if in compression. Neglect any horizontal reaction components under the feet B, C, and D. Assume F = 780 lb, b = 13 in., h = 20 in.
The base of an automobile jackstand forms an equilateral triangle of side length 13 in. and is centered under the collar A. Model the structure as one with a ball and socket at each joint and determine the force in members BC, BD, and CD. The forces are positive if in tension, negative if in compression. Neglect any horizontal reaction components under the feet B, C, and D. Assume F = 780 lb, b = 13 in., h = 20 in.
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The base of an automobile jackstand forms an equilateral triangle of side length 13 in. and is centered under the collar A. Model the structure as one with a ball and socket at each joint and determine the force in members BC, BD, and CD. The forces are positive if in tension, negative if in compression. Neglect any horizontal reaction components under the feet B, C, and D.
Assume F = 780 lb, b = 13 in., h = 20 in.
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The base of an automobile jackstand forms an equilateral triangle of side length 13 in. and is centered under the collar A. Model the
structure as one with a ball and socket at each joint and determine the force in members BC, BD, and CD. The forces are positive if in
tension, negative if in compression. Neglect any horizontal reaction components under the feet B, C, and D.
Assume F = 78O Ib, b = 13 in., h = 20 in.
F
h
Answers:
BC =
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Ib
BD =
i
Ib
CD =
Ib
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