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一、问题的提出一块金属用弹簧秤在空气中称时重5.4牛,将金属块没入水中称时弹簧秤的示数3.4牛,这个金属块的密度是多大?对于这一问题常规的解法是先通过“读数差法”算出该金属块受到的浮力,然后根据阿基米德原理 F_浮=ρ_液gV_排,算出 V_排,因为物体浸没,所以 V_排=V_物,最后再根据重力公式和密度公式算出该金属的密度.由于计算过程中运用到的公式较多,且 g 的取值又含有小数,算
First, the problem is proposed a metal spring balance weighs 5.4 cattle in the air, when the metal block is submerged in the water, the spring scale shows the number of 3.4 cattle, the density of this metal block is how much? For this problem, the conventional solution is passed first “Reading difference method ”Calculate the buoyancy of the metal block, and then according to the Archimedes principleF_float=ρ_liquid gV_row, calculate the V_row, because the object is immersed, so V_row=V_ Finally, according to the gravity formula and the density formula, the density of the metal is calculated. Since there are many formulae used in the calculation process, and the value of g contains a decimal number,