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8. A meter stick is pivoted at a point a distance a from its center and swings as a physical pendulum. Of the following values for a, which results in the shortest period of oscillation?
(A) a = 0.5 m
(B) a = 0.3 m
(C) a = 0.2 m
(D) a = 0.1 m
(E) a = 0 m.

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 【站僕】摩檸Morning：有沒有達人來解釋一下?
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