Re: [問題] 物理!
(1)
: 有一個密封的箱子裡充滿水,箱內一木球,比重0.8,體積50cm^3
: 以繫繩繫於箱底,若箱子鉛直向下做4.9m/s^2的等加速度運動
: 則繩子的張力為?
: Ans:5gw
B=DV=1*50=50gw(向上)
重量是40g 在地球上 所以直接當40gw(向下)
所以 50-40=10(向上) 所以繩張力=10gw(向下)
當 4.9公尺/秒^2 向下 相對來說 就是地心引力 變成9.8-4.9=4.9
也就是說 地心引力減弱一半 我們都知道 人在月球上 的重量 會是 地球上的 1/6
同理
所以 就是 10/2 = 5gw
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慣性? 那就很像是 國中的電梯問題了吧 這兩個問題的差異 就只在有沒有浮力
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※ 編輯: clothj21194 來自: 111.240.242.216 (10/30 22:11)
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