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20 17 mathematical model of Hongqiao district ii
(1)∑ρ 1 =ρ2, V A > V B They are all completely immersed.

∴ their buoyancy f 1 > F2,

∫A sinks and B hangs.

∴G A > F 1,G B =F2。

∴G a > g b,

(2)∫A sink, B float, C float,

∴ ρ A > ρ 1,ρ B =ρ2,ρ C < ρ 3

∵ρ 1=ρ2>ρ3,

∴ ρ A >ρB >ρC,

(3)∵V B > V C, as can be seen from the figure, V B > V C.

∵ ρ 2 >ρ3.

Their buoyancy F2 > F3, both balls float, and their buoyancy is equal to their own gravity.

∴G b > British c,

∴G A > uk b > uk c,

So choose ad.