[問題] 科學班物理試題
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【出處】中一中科學班入學試題
【題目】質量1公斤的均質物體,於深度10公尺的游泳池面上方5公尺處自由釋放,
由物體接觸水面瞬間開始計時,物體將於2秒後抵達池底,假設物體在整個過程中僅受重力,
浮力作用,試求物體比重(重力加速度=10公尺/秒平方) (A)0.5(B)1(C)1.5(D)2
【瓶頸】自由釋放後,到達水面速度10,2秒到達池底,算出在水中加速度=-5
合力向上,再用合力=ma 重力10牛頓向下,浮力10/D牛頓向上 10/D-10=1*5
算出物體密度2/3,請問哪裡出錯?謝謝
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