Surface necessary to keep the device from slipping 20

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surface necessary to keep the device from slipping? (20 points) Problem 4 . (a) Determine the magnitude of the applied couples M when θ = 60º to maintain equilibrium of the frame. (b) If the moments are applied at the midpoints of OA and OB , determine the internal axial force, shear force and bending moment at a location one quarter of the distance from O to B . (25 points) Problem 5 . Determine the tensions in the cables and the reactions at A . (20 points)
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