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20 16 Changping district mathematics module 2
A: A: I agree with Xiaohong. Xiao Ming didn't consider that the pressure in liquid should be the sum of atmospheric pressure and liquid pressure. Because of buoyancy (pressure difference between upper and lower sides), we can know that F float = (ρ water g 12L+P0). L2-P0-L2 = rho water g 12L3(P0 stands for atmospheric pressure).