physics

A ball has a diameter of 3.89 cm and average density of 0.0842 g/cm3. What force is required to hold it completely submerged under water?

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  1. find the volume of the ball (sphere)

    mass = volume * density

    forces on the ball
    ... gravity ... downward ... m * g
    ... buoyancy ... upward ... equal to mass of water displaced times g

    (ball volume) * (water density) * g =
    ... [(ball mass) * g] + (hold down force)

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