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18. A particle of mass 1 kg is confined ..-阿摩線上測驗
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18. A particle of mass 1 kg is confined to move in the one-dimensional region x ＞ 0.
It is subject to a potential energy function 
(Joules). If the particle is
initially placed at its mechanical equilibrium position and then given a small
displacement, what is the period of its subsequent oscillations?
(A) 
(B) 
(C) 
(D) 
(E) None of the above