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sqrt(4 * 9.81 m/s^2 * 1 meter / (3*0.5 ) * (1500 kg/m^3 -1000 kg/m^3)/1000 kg/m^3)=
sqrt(4 * 9.81 m/s^2 * 1 meter / (3*0.5 ) * (1500 kg/m^3 -1000 kg/m^3)/1000 kg/m^3)=
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