有这样一道中考题:如图1所示,弹簧下挂一长 L=20厘米的长方体物体,弹簧秤的示数为 F_1=27牛,在物体下方放一装有水的容器,容器的截面积 S_2(壁厚不计)是物体横截面积 S_1的3倍,当物体有2/5的体积浸入水中时,弹簧称的示数为 F_2=23牛.求:(1)该物体的密度;(2)物体未放入水中与物体有2/5的体积浸入水 There is such a test: As shown in Figure 1, under the spring hang a long rectangular object with L = 20 cm, the spring scale shows the number of F_1 = 27 cattle, put a container filled with water under the object, the cross-sectional area of ​​the container S_2 (without wall thickness) is 3 times the cross-sectional area of ​​the object S_1. When the volume of the object is immersed in water 2/5, the number of springs is called F2=23 N. Find: (1) the density of the object; 2) The object is not placed in water and 2/5 of the volume is immersed in water