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    Working with the force of buoyncy

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    A copper piece of mass 10g is suspended by a vertical spring. The spring elongates 1cm over its natural length to keep the piece in equilibrium. A beaker containing water is now placed below the piece so as to immerse it completely in water. Find the elongation of the string.

    Density of copper is 9000 kg/m^3
    g = 10 m/s^2

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    Solution Preview

    Let the spring constant be k. When the piece is hanging in air, the equilibrium condition gives (from kx = mg)

    k x 1cm = 0.01 kg x 10 m/s^2
    = 0.1 N

    The volume of the ...

    Solution Summary

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