The density of wood is 650 kg/m3.
That depends on the species of wood. Balsa is very light, D ~ 0.2. Other woods are more dense. Any that float in water have a density less than 1. If it sinks the density is greater than 1.
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The density of a wood is 0.72g/cm3 what will be the mass off the wood with measures 30cm101010?
Not if the wood is uniform.
It depends of the piece of wood itself and the type of wood that it is.
Density of wood = mass/volume
The secret is that copper packs more mass than wood or plastic do into the same volume.