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Springs in water

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A light spring of constant k = 164 N/m rests vertically on the bottom of a large beaker of water (see Fig. a). An m = 4.63 kg block of wood (density = 630 kg/m3) is connected to the spring and the mass-spring system is allowed to come to static equilibrium (see Fig. b). What is the elongation, DeltaL, of the spring?

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The expert examines the springs in water.

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For the system to be in equilibrium,
the downward gravitational pull on the system should equal to the upward ...

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