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例1地质队员在高山深谷探矿,利用一种叫浮力秤的轻便仪器就可以精确测出矿石的密度．图1是浮力秤的示意图,它中部是一密封的空心圆筒,圆筒下端挂着小篮,圆筒上端有一根刻有标志线的竖直杆,杆顶装有小盘．因为圆筒是空心的,下面挂的小篮又较重,所以浮力秤放在水中能保持直立漂浮状态．现需测一矿石的密度,地质队员进行如下操作：a．先将浮力秤放入水中,在小盘内加砝码,
Case 1 The geological team explores the deep valleys and uses a portable instrument called a buoyancy scale to accurately measure the ore density. Figure 1 is a schematic diagram of a buoyancy weigher, which is a sealed hollow cylinder in the middle, a small basket hung on the lower end of the cylinder, a vertical rod engraved with a marking line on the upper end of the cylinder, and a small disk at the top of the rod. Because the cylinder is hollow, the small baskets below are heavy, so the buoyancy scales can stay upright and float in water. Now need to measure the density of an ore, geological team members perform the following operations: a. First put the buoyancy scale into the water and add the weight in the small plate.