Question

What are the weight differences between pre- and post-1982 pennies? Why?

Answer 1

Answer:

Explanation:

While the new penny was the exact same size as the old one, it weighed less because zinc is slightly less dense than copper. The change from copper to zinc took place in 1982. For this reason the heavy pennies in the exercise will be dated 1980-82.

Answer 2

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While the new penny was the exact same size as the old one, it weighed less because zinc is slightly less dense than copper. The change from copper to zinc took place in 1982. For this reason the heavy pennies in the exercise will be dated 1980-82.