如圖所示,懸掛在天花板下重60N的小球,在恆定的水平風力作用下靜止在偏離豎直方向θ=30°的位置。求: (1)...
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問題詳情:
如圖所示,懸掛在天花板下重60N的小球,在恆定的水平風力作用下靜止在偏離豎直方向θ=30°的位置。求:
(1)水平風力的大小;
(2)繩子拉力的大小;
(3)若剪斷懸掛小球的細繩,小球沿何方向做何運動。
【回答】
解:由分析受力得
(1)·························(2分)
得:······························(2分)
(2)································(2分)
得:······························(2分)
(3)剪短懸線後,由於重力和水平風力不變,合力恆定,方向沿懸線方向向下。故小球沿懸線方向向下做勻加速直線運動。······················(2分)
知識點:未分類
題型:未分類