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20 14 dual-mode mathematical answers
(1) in water: G-F=ρ gV drainage-①

In unknown liquid: G-F'=ρ gV liquid discharge-②

From ① ②, the density of liquid: ρ liquid =G? f’G？ Fρ water;

(2) Experimental steps: ① Tie pebbles with fine iron wire, and pour proper amount of water and liquid into two beakers respectively;

② Measure the gravity g of pebbles with a spring dynamometer;

(3) measuring the pulling force f of small stones immersed in water with a spring dynamometer;

(4) measuring the tensile force F' of the pebbles immersed in the liquid B with a spring dynamometer;

As shown in the figure below:

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