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28 August, 23:35

What fraction of a piece of concrete will be submerged when it floats in mercury? the density of concrete is 2.3*103kg/m3 and density of mercury is 13.6*103kg/m3?

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  1. 29 August, 00:38
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    17% Any object that is floating will display the volume of fluid that matches the mass of the object that's floating. So if the object is 100% as dense as the fluid, it will just barely sink, if it's 50% as dense as the fluid, 50% will be submerged, etc. So let's see what percent of mercury's density is concrete. 2.3x10^3 / 13.6x10^3 = 0.169117647 = 16.9117647% Rounding to 2 significant figures gives 17%. So 17% of a piece of concrete will be submerged in mercury when it's floating in mercury.
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