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A ball has a diameter of 3.70 cm and average density of 0.0841 g/cm3. What force is required to hold it completely submerged under water?

I need to find the magnitude in N
Thank you!

  • Physics -

    Let the unknown required force be F.

    F + M*g = buoyant force
    = (volume)*(water density)*g

    Volume = (pi/6)*D^3 = 26.52 cm^3
    M = Mass = 2.23 g

    That is an extremely light ball. More like a balloon.

    The buoyancy force is much larger than the weight.

    Solve for F

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