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题目1:如图1所示,一块纯冰浮在水面上,当将露出水面的部分 Q_1熔化后,液面怎样变化?解:(1)熔化前,冰排开水的体积:设 Q_1部分的质量为 M_1,Q_2部分的质量为 M_2,因冰浮在水面上,所以有:F_浮=G_冰=M_冰g=(M_1+M_2)g∴ρ_水gV_排=(M_1+M_2)g 即 V_排= (2)Q_1部分熔化成水后的体积:∵Q_1虽熔化成水,但其质量不变,即有M_(化水)=M_1∴Q_1化成水的体积为 V_化=M_(化水)/ρ_水=M_1/ρ_水(3)这时 Q_2部分仍漂浮在水面上,仍要排
Question 1: As shown in Figure 1, a piece of pure ice floats on the surface of the water. When the part Q_1 exposed to the water is melted, how does the liquid surface change? Solution: (1) Before melting, the volume of water discharged from the ice: Let the Q_1 part be The quality is M_1, and the quality of the Q_2 part is M_2. Because the ice floats on the water, there are: F_float=G_ice=M_iceg=(M_1+M_2)g∴ρ_watergV_row=(M_1 +M_2)g is the volume of V_row = (2)Q_1 partially melted into water: Although ∵Q_1 is melted into water, its mass does not change, that is, the volume of M_(water)=M_1∴Q_1 is converted into water. V_ification = M_(Chemical water)/ρ_Water = M_1/ρ_Water (3) At this time, the Q_2 part still floats on the water and still has to be ranked.