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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.
This can't be answered in its current form. The mass of a sample of wood can only be determined from its volume and known density. If you know both of those values, you can determine mass by the formula: m = D * V
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.