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7 September, 01:44

light spring of force constant k = 158 N/m rests vertically on the bottom of a large beaker of water (Figure a). A 4.36-kg block of wood (density = 650 kg/m3) is connected to the spring, and the block-spring system is allowed to come to static equilibrium (Figure b). What is the elongation ΔL of the spring?

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  1. 7 September, 02:20
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    0.146 m

    Explanation:

    f = - KΔL according to Hooke's law

    volume of water displaced = mass / density of block since a body will displace equal volume of its own

    weight of water displaced = mass of water * acceleration due to gravity

    and mass of water = volume of water / density of water

    weight of water displaced = Vw * dw * g = mg (dw / dblock)

    net force = mg - mg (dw / dblock) = 42.728 - 65.74 = - 23.00

    it will be balanced by a restoring force of 23 N

    ΔL = F / k = 23 / 158 = 0.146 m
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