The u. s. penny has a diameter of 1.905 cm. the densities of copper and zinc are
8.96 g/cm3 and 7.14 g/cm3, respectively.
a. between 1944 and 1982, the penny was made of a brass alloy that is 95% copper and 5% zinc by mass. if the mass of the penny was 3.09 g, find the volume (in cm3) and thickness (in cm) of the penny in mm. (assume the penny is a cylinder, v = πr^2h)

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