M.n giúp em với ạ em cảm ơn một bình thông nhau hình chữ u có 1 nhánh chứa thuy ngân nhánh kia chứa chất lỏng khác.Biết độ cao cột thủy ngân cách mặt phân cách của 2 chất lỏng là 4cm còn độ cao của chất lỏng khác thì cách mặt phân cách của 2 chất lỏng là 27,2cm.Tính trọng lượng riêng của thủy ngân là 13600N/m^3

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