The weighted “bulb” of the hydrometer displaces 10 cm3

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The weighted “bulb” of the hydrometer displaces 10 cm3 of liquid, and the rod attached to it, having a cross section of 1.0 cm2, is immersed to a depth of 10 cm in water, with a density of 1000 kg / m3. Determine the immersion depth of the hydrometer in a liquid with a density of 1000 * Z kg / m3.
Given: Vb = 10cm3 = 10 * 10-6m3; ωst = 1.0cm2 = 10-4cm2; hv = 10cm = 0.1m; ρ = 1000kg / m3; ρzh = 1000 * Z = 1000 * 2 = 2000kg / m3

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