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想請教這題的第三小題： 網路上的解法是 因為質心位置不變，可視為彈簧的斷點(意即斷成兩段彈簧) 兩段彈簧有新的彈簧常數，再套入簡諧週期公式即可 我的問題是： 為什麼位置不變的質心就可以視為彈簧的斷點？ 然後一定要是質心嗎？ 謝謝🙏
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請問有人知道為何這是摩擦起電嚒？ 高一.物理L.2 ~）
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想請教此題 這裡正向力N是要額外算的 不能代N=mgcos 公式 那什麼樣的情況下才能代此公式？
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為什麼由左向右加速度還會有負的 題目沒說有右向左吧？
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為什麼氣體分子體積極小，發生碰撞時都是彈性碰撞
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想問第八題，請問那時候的受力狀況是什麼，為什麼加速度會大於等於重力，不是只有等於嗎？？
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請問這題要怎麼算？ 答案A E
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為什麼不會發出強光
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