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calc the buoyant force on a 2 L helium balloon

  • physics -

    Buoyant force is the wt. of the water displaced.

    2L = 2000cm^3.
    Density of water = 1g/cm^3.

    F = 2000cm^3 * 1g/cm^3 = 2000 Grams.

  • physics -

    2000g = 2kg = mass.

    F = mg = 2kg * 9.8N/kg = 19.6 N.

  • physics -

    I got that far too, but the answer is supposed to be 2.53x10^-3 N. I am not given anything else but the volume.

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