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a cube of wood 30 cm on a side and having a density of 0.65 g/cm^3...

a cube of wood 30 cm on a side and having a density of 0.65 g/cm^3 floats on water. A) what is the distance from the top of the cube to the water level? B) how much lead weight has to be placed on top of the cube so that its top is just level with the water?
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