posted by josh .
find the weight of a piece of wood with a density of .5 g/cm cubed. which when attached to a 5kg stone in water it will sink. the density of the stone is 3g/cm cubed
ok, when sinking
weight of wood+weightstone=weight of waterdiaplaced
volumeWood=MassWood/.5g in cm^3
volumestone=5000g/3g in Cm^3
solve for mass wood.