125_Problem CHAPTER 10 - PROBLEM 10.104 CONTINUED For = 0 d...

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PROBLEM 10.104 CONTINUED For 0: θ = 2 2 2 1 2 θ = − + d V Pl ka d For Stability: 2 2 2 1 0, 0 2 θ > + > d V Pl ka d or (for parts a and b ) 2 2 < ka P l W Note : To check that equilibrium is unstable for 2 , 2 = ka P l we differentiate (1) twice: 3 2 3 sin sin 2 0, for 0, θ θ θ θ = +
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