A copper penny has a mass of #3.1# #g# and a volume of #.35# #cm^3#. What is the density of copper?

1 Answer
anor277
Aug 11, 2016

#rho=(3.1*g)/(0.35*cm^3)~=9*g*cm^-3#

Explanation:

#"Density"# #=# #"Mass"/"Volume"# by definition.

Now this is the density of the copper coin, not copper. In the UK copper coins, the #1# #p# and #2# #p# coins are copper plated steel; clearly, this is done for durability. AS you probably know, pure copper is fairly soft and malleable.

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