ch15-p081 - 81. (a) We require U = 1 E at some value of x....

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Since we are asked for the interval t eq t where t eq specifies the instant the particle passes through the equilibrium position, then we set x = 0 and find = 4 + 3 0 = 2.29 . 1 t eq cos s π π bg Consequently, the time interval is t eq t = 0.75 s. 81. (a) We require U E = 1 2 at some value of x . Using Eq. 15-21, this becomes 1 2 = 1 2 1 2 = 2 . 22 kx kx x x m m F H G I K J ¡ We compare the given expression
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