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Calculate the volume = length * breadth * thickness, where these are measured in centimetres.
Multiply by the density = 8.96 grams per cubic centimetre to obtain the mass in grams.
Divide by 1000 to get the mass in kilograms.
Finally, multiply by 9.8, the acceleration due to gravity.
The answer is the weight, in Newtons.
I will assume you mean a rectangular block. Here are the steps:* Look up the density of copper.
* Multiply length x width x height to get the volume.
* Multiply the volume times the density of copper, to get the mass.
* If you meant MASS, you are done; if you really want the WEIGHT, multiply the mass x the gravity (approximately 9.8 in SI units), to get the weight.
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