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問題的種類

自然 國中

請問為什麼第8題D選項甲增加的位能=乙減少的位能還要再加上手的作功呢,另外這整題我也不是太懂,可否說明一下,謝謝

請閱讀下列敘述後,回答7、8類: 自然課時老師讓同學利用珍珠吸管螺帽與细線組 合成圓周運動的教具,如圖(一所示,讓在上面的螺帽進 行圓周運助,老師要求同學儘量讓螺帽穩定作圓周運 動。 | ACTV wow | 17 已知圆周運動所需的向心力隨速率而增大,隨運動半徑增大而减小。 日 一是甲、乙、丙三位同學都選擇在短時間內作等速率圓周運動員。 幾乎呈水平則者正確? 乙 内 27 2個螺帽 4mg=fa 4個螺帽 4ngefa 日 4個螺帽 ____ 2mg=Fa 圖(二) Falfe ptt CH P色 vipeves, Fa CIPLO 3 re } (A)甲的週期於乙 (B)甲、乙兩圖的向心力相同 (C)乙圖的螺帽速率小於丙= (D)乙、丙兩圖的向心力不同 SFAIVRELE RRECRA va 9 ||| 8. 老師示範圖(三)的實驗時,在上方螺帽(稱為甲)作圓周 e 運動時,緩緩將下方的螺帽(稱為乙)向下拉,會發現 上方的螺帽愈轉愈快。假設實驗過程甲持續保持水平旋 轉,也忽略摩擦力,則關於此實驗過程,下列敘述何者 正確? (A)甲的重力對甲作正功。) A-MAN (B)乙的重力對乙作負动业→NT$9,"bar、 (C)手施力對乙作正功是使甲動能增加的原因之一 ( Inut 乙手往下拉 元动 | D)甲增加的動能=乙减少的位能 Androme Largumenty GRW 3 佛(5) VE B VABL (FAR {mv9ELE

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英文 高中

為什麼11題made後面是接replied而不是reply?😭😭😭

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