PROBLEM 10.91 The uniform plate ABCDof negligible mass is attached to four springs of constant kand is in equilibrium in the position shown. Knowing that the springs can act in either tension or compression and are undeformed in the given position, determine the range of values of the magnitude Pof two equal and opposite horizontal forces Pand −Pfor which the equilibrium position is stable. SOLUTION Consider a small clockwise rotation θof the plate about its center. Then
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