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Calculate length x width x height to get its volume. Then, to get its mass, multiply that by the density of wood - that varies a bit from one type of wood to another, but it is usually a bit less than the density of water, which is about 1 gram per cubic centimeter.

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10y ago
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Q: What mass rectangular pieace of wood which is 20cm long 4.9 cm wide and 4.9 cm high?
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