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範例:浮力與動力學

水槽中裝水且置於地表,木塊甲的截面積為100cm2,與乙物(密度4g/cm3,質量1kg)以細繩相連,整體置於水中如圖A所示,木塊露出水面高度h=5cm,則下列敘述何者正確?(A)此時繩上張力為750gw (B)將繩剪斷,乙物下沉的加速度大小為3g/4 (C)將乙物置於甲之上方如圖B所示,則h'=2.5cm (D)C所示水面較圖B為高 (E)C中欲將甲物全部壓入水中,至少要施力1200gw[88 ]

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