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题目 （１９９９年南通市中考第３８题）如图图１１（甲），将一边长为１０厘米、质量为０．８千克的正方体物块Ａ，用一根不可伸长的细线悬挂在装有水的容器中．容器的底面积为３００厘米２，下部有一关闭着的出水小阀门Ｋ，此时细线刚好伸直，且受到的拉力为零．求：（１）
Topic (Nantong City Entrance Exam Question No. 38 of 1999) As shown in Fig. 11(a), a square block A with a length of 10 cm and a mass of 0.8 kg is suspended in a load with an inextensible thin wire. In the container with water. The bottom area of the container is 300 cm 2 , and the lower part has a small outlet valve K closed. At this time, the thin wire is straightened and the pull force is zero. Seeking:(1)