An ancient gold coin is 2.20 cm in diameter and 3.00 mm thick. It is a cylinder and the density of gold is 19.3 grams/cm^3, what is the mass of the coin?

1 Answer
anor277
Jan 24, 2017

Approx. #22*g#

Explanation:

#rho, "density"="mass"/"volume"#

And thus #"mass"# #=# #rhoxx"volume"#, and we know the #"volume"# of a cylinder is #pixxr^2xxl#, where #r="diameter"/2#, and #"length"# is as given.

And thus #"mass"=19.3*g*cm^-3xxpixx0.300*cmxx(1.10*cm)^2=??g#

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