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Tension in 3 cables lifting horizontal plate

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The square steel plate has a mass of 1800 kg with mass center in its center G. Calculate tension in each of the three cables with which the plate is lifted while remaining horizontal.

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As the placement of the cables has mirror symmetry about the plane CDG, the two cables AD and BD can be replaced by a temporary virtual cable DE drawn in red in the picture.
The cables DE and DC are also symmetric with each other and so they have the same tension T1.
The cosine of the angle between the vertical ...

Solution Summary

As the placement of the cables has mirror symmetry about the plane CDG, the two cables AD and BD can be replaced by a temporary virtual cable DE drawn in red in the picture.
The cables DE and DC are also symmetric with each other and so they have the same tension T1.

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