Since 1983, the U.S. Mint has coined pennies that are made out ofzinc with a cop

Question

Since 1983, the U.S. Mint has coined pennies that are made out ofzinc with a copper cladding. The mass of this type of penny is 2.50g. Model the penny as a uniform cylinder of height 1.23 mm andradius 9.50 mm. Assume the copper cladding is uniformly thick onall surfaces. If the density of zinc is 7140 kg/m3 andthat of copper is 8930 kg/m3 what is the thickness ofthe copper cladding? (Assume that the thickness is much less thanthe radius and the height of the penny.)

*answer should be in micro meters

Explanation / Answer

You can try to follow the following,or just submit the answer of 1.75 ?m. m = ?zincVzinc ?copperVcopper V = ?R2 Vzinc =?(R-d)2(h-2d) Vcopper = V -Vzinc ...Do some hefty algebra, and arrive at d = 1.75 ?m

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