| 1. | Prepare a table to summarize the density data you collected. 
 
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| 2. | The accepted values for the densities of aluminum, lead and copper are 2.70, 11.34 and 8.94 g/ml, respectively.  You determined the density of a cylinder composed of one of these metals.  Calculate the percent error in your determination. 
 
   
 
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| 3. | In the experiment you determined the mass of a stack of ten pennies, the volume of a stack of ten pennies and the density of a stack of ten pennies.  What is the average mass, average volume and average density of a single penny? 
 
   
 
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| 4. | Legend has it that Archimedes, a Greek Mathematician, determined that a jeweler had cheated King Hieron the 2nd by creating a crown not made from pure gold as he had claimed.  If given a piece of "pure gold" jewelry, explain how you might determine if this is really the case. 
 
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| 5. | You have the penny density values for each of years between 1980 and 1989.  Prepare a graph of density versus year.  You should observe a discontinuity in the data.  Identify between what two years the discontinuity occurs and propose an explanation for it. |