[解題] 理化-力
1.年級:國二
2.科目:理化
3.章節:南一版第四冊第五章 力與壓力
4.題目:
施力將一沉船拖上岸, 請問所需的力是?(假設不同深度的水密度相同)
(A) 越來越大 (B) 越來越小 (C)不變
沒有答案
5.想法:
(想法一)
我認為答案是(B)
因為P=hD 所以越淺的話,壓力越小,所需要的力也越小
(想法二)
換一個角度看
施力 > (物重-浮力) 合力向上即可將沉船拉起
而 (物重-浮力) 不因水深度而改變
若這個想法對的話答案為(C)
所以想請教各位的看法
請不吝指教 謝謝
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