Physics! Volume!! HELP

An object hanging on a scale reads 24.0g when submerged in water, but 48.0 g when submerged in oil (specific gravity 0.80) Find the density of the object.

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asked by Mark
  1. assume Mass M for the object.

    in water, 24=M-densitywater*volume
    in oil, 48=M- densityoil*volume

    subtract top equation from bottom.

    24=densitywater*volume-densitoil*volume
    volume=24/(1-.8) cm^3
    volume= 120cm^3

    Now, solve for M.
    24=M-1*120
    M=144grams

    density=144/120 g/cm^3

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    posted by Nikki

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