2006-10-08 14:18:22 · 6 answers · asked by Anonymous in Education & Reference ➔ Teaching
A press presses the penny shape, into a sheet on Zinc that is coated in a thin layer of copper.
2006-10-08 14:20:47 · answer #1 · answered by Anonymous · 1⤊ 0⤋
You can go to this site and take a tour to see how they are minted.......
http://www.usmint.gov/about_the_mint/mint_facilities/index.cfm?action=PA_facilities
The first penny was made in 1787 precisely. Also, Ben Franklin actually suggested the idea.
The mass of a penny has changed throughout the years. The first Lincoln cent was produced in 1909 and had the wheat ears pattern on the reverse side. The composition of the penny was pure copper from 1793 to 1837. Then following that, it was made of bronze, and in 1857, it was made out of copper. In 1943, the content of the coin was changed to zinc coated steel because of the copper shortage during World War 11. Before 1982, pennies were 95% copper and 5% zinc. Then after 1982, the compostion was 97.6% zinc, and 2.4% copper. So this means that the pennies made before 1982 will have a different mass from those made after 1982.
In a modern physics textbook, the mass of a penny was used as part of a word problem. It gave the mass of a penny to be 3.1 grams. Along with that information, I found a website that discussed the composition, mass, and density of a penny. The mass of a penny was 3.1 grams before 1982, but a penny after 1982 weighs 2.5 grams. According to the mint, from the United States Treasury website, to find out the mass of a penny, it also gave the mass as 2.5 grams.
So I decided to go out on my own and measure different pennies from different years. When I measured the 1980 and 1971 penny, it weighed 3.1 grams. The 1961 and 1956 pennies weighed 3.2 grams. But when I weighed the 2001 penny, it weighed 2.5 grams, which should be correct because it was made after 1982. So I basically found the same mass of a penny from all different sources.
Life Span: The approximate life span of a coin is 30 years.
Mutilated Coins: United States Coins no longer fit for circulation are classified as "uncurrent" or mutilated.
Uncurrent coins are coins that are worn yet recognizable as to genuineness and denomination, and are machine countable. Uncurrent coins are redeemed by the Federal Reserve Banks, then forwarded to the Mint for disposition.
Mutilated coins are coins that are chipped, fused and not machine countable. Mutilated coins are only redeemable through the United States Philadelphia Mint facility.
All uncurrent or mutilated coins received by the Mint are melted and reused in the manufacture of coinage strips.
2006-10-08 21:31:37 · answer #2 · answered by mysticideas 6 · 0⤊ 0⤋
They are stamped from a strip of copper plated zinc with a high speed punch press. This makes them thinner on one edge. Previously punched from sheets they were uniform in thickness. I remember when the present coin came out that people hoarded them because of the apparent "flaw"
2006-10-08 21:29:51 · answer #3 · answered by eferrell01 7 · 0⤊ 0⤋
by marinating them in mint of course! usually best with a fusion of water and steeping for 24 hours.
2006-10-08 21:40:14 · answer #4 · answered by Anonymous · 0⤊ 0⤋
the same way all coins are, one at a time
2006-10-08 21:20:05 · answer #5 · answered by jperk1941 4 · 0⤊ 0⤋
poured and stamped
2006-10-08 21:26:13 · answer #6 · answered by Anonymous · 0⤊ 1⤋