一質量為m之質點附在一質量可略去之長桿一端。該長桿能以其另一端為軸在一垂直面上無�擦地自由旋轉。若長桿最初靜止於與鉛垂線成60角之位置如下圖 Template




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tomski一質量為m之質點附在一質量可略去之長桿一端。該長桿能以其另一端為軸在一垂直面上無�擦地自由旋轉。若長桿最初靜止於與鉛垂線成60角之位置如下圖 coloring