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牛頓第三定律,壓力=比重= 4.9×10 ^ 4N; 重力加速度g =毫克,G = 9.8N/Kg,上質量m = 49000/9.8 =5000公斤 壓力的P = F / S = 49000 /(2X0.7)= 3.5X10 ^ 4PA.
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