9. The boom AC in the figure rests in a ball and socket joint at A and is held in equilibrium by the cables BE and CD. The load applied at C. Determine the coordinates of D in the YZ plane so that the force in CD will be a minimum. Neglect the weight of the boom and cables. Answers: y = 16 ft; z = -34.7 ft 300 Ib TER 900 Ib

9. The boom AC in the figure rests in a ball and socket joint at A and is held in equilibrium by the cables BE and CD. The load applied at C. Determine the coordinates of D in the YZ plane so that the force in CD will be a minimum. Neglect the weight of the boom and cables. Answers: y = 16 ft; z = -34.7 ft 300 Ib TER 900 Ib

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter4: Coplanar Equilibrium Analysis

Section: Chapter Questions

Problem 4.125P: The figure shows a three-pin arch. Determine the horizontal component of the pin reaction at A...

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Question

9. The boom AC in the figure rests in a ball and socket joint at A and is held in equilibrium by the
cables BE and CD. The load applied at C. Determine the coordinates of D in the YZ plane so that
the force in CD will be a minimum. Neglect the weight of the boom and cables.
Answers: y = 16 ft; z = -34.7 ft
4'1
300 Ib
900 Ib
Note:
The reaction at ball and socket joint is always represented by thè x, y and z components.
ETER

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