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10 questions
如附圖所示,小豪以輕繩繫一球,手執另一端,使球在水平面上做等速率圓周運動,則下列敘述何者錯誤?
繩子拉球的力,提供了球所需的向心力
繩子拉球的力,其反作用力為繩子拉手的力
球在水平面上做加速度運動
若手釋放繩子,則球沿切線方向甩出去
逆時鐘旋轉淋溼的雨傘,當轉速加快到某一程度時,甲點的水滴會沿著雨傘邊緣的哪個方向飛離?
a
b
c
d
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