[請益] 壓力題目討論
將塑膠片置於開口玻璃管壓入酒精密度0.8g/cm3
則玻璃管內注水16cm塑膠片開始落下
如果塑膠片面積為40cm2,則玻璃管內放入多少gw物體塑膠片會開始落下?
答案是640gw
我覺得好像不能這樣算?
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