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12 December, 18:22

A 0.82 kg piece of wood floats in water but is found to sink in alcohol (sg=0.79), in which it has an apparent mass of 0.059 kg.

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  1. 12 December, 18:37
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    Upthrust = loss in weight = 0.82 - 0.059 = 0.761 Kg

    upthrust = weight of the displaced fluid = 0.79*Vg where Vg is the volume of the piece of wood

    Therefore:

    0.761 = 0.79 Vg

    Vg = 0.96329

    Density of wood (sg of wood) = mass / volume

    density of wood = 0.82 / 0.96329 = 0.85
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