106_Problem CHAPTER 10

106_Problem CHAPTER 10 - PROBLEM 10.91 The uniform plate...

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PROBLEM 10.91 The uniform plate ABCD of negligible mass is attached to four springs of constant k and 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 P of two equal and opposite horizontal forces P and P for which the equilibrium position is stable. SOLUTION Consider a small clockwise rotation θ of the plate about its center. Then
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