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A student weighs 1131 pennies and finds them to have a mass of 3001.8 g If the pre-1982 pennies weigh on average 3.09 g and the post-1982 pennies weigh 2.51 g how many of the pennies are post-1982?
Of 1131 pennies, x weigh 3.09 g and y weigh 2.51 g. In total, the 1131 pennies weigh 3001.8 g. 3.09x + 2.51y 1131 = 3001.8 I have no idea what to do after that, or if it's even right. I was thinking maybe dividing, but the number was so small it had to be wrong. Tell me, what grade is this for?
What percent copper is a 1984 penny?
Next to none. Post-1982 pennies are only plated with copper, they are mostly zinc. The amount of copper on a post-1982 penny is miniscule and costs more to remove than melt value is.
How much does 4000 US pennies weigh?
One modern (post-1982) US cent weighs 2.5 grams, so 4,000 pennies weigh 10,000 grams, or 10 kg.
How many pounds of Pennys equals one dollar?
Presuming that you are asking about US Lincoln pennies, the answer is that it depends. If the pennies are pre-1982, they are 95% copper and 5% zinc and weigh 147 to the pound. If the pennies are post-1982, they are 2.5% copper and 97.5% zinc and weigh 181 to the pound. In 1982, both types were made. In 1943, pennies were made from steel coated with zinc (so-called "silver pennies" or "steel pennies") and in 1944 (and I think 1945 as well) from old brass shell casings, so their counts would be a bit different.
Weight of a roll of pennies?
The weight could vary a bit, depending if the coins are pre-1982 copper cents (3.11 grams each) or post-1982 zinc cents (2.5 grams each). At 50 pennies to a roll, it could weigh between 125 and 155.5 grams.
Post 1982 pennies were made of what type of metal?
Post 1982 pennies in the United States are made of 97.5% zinc and coated with a thin layer of copper. Prior to 1982, pennies were made of 95% copper.
A student weighs 1131 pennies and finds them to have a mass of 3001.8 g If the pre-1982 pennies weigh on average 3.09 g and the post-1982 pennies weigh 2.51 g how many of the pennies are post-1982?
Of 1131 pennies, x weigh 3.09 g and y weigh 2.51 g. In total, the 1131 pennies weigh 3001.8 g. 3.09x + 2.51y 1131 = 3001.8 I have no idea what to do after that, or if it's even right. I was thinking maybe dividing, but the number was so small it had to be wrong. Tell me, what grade is this for?
Which is more dense a pre 1982 penny or a post?
8.869 grams per cubic centimeter approximately. Some 1982 pennies are made of bronze alloy (pre1982) and some are copper plated zinc (post 1982). The change was made at the beginning of 1982 after some pennies had already been struck.
Is the ratio of copper to zinc in the pennies made after 1982 higher or lower than the ratio of copper to zinc in the pennies made before 1982?
The pre-1982 pennies are 95% copper and 5% zinc. Post-1982 cents are 97.5% zinc and 2.5% copper.
How much does 1000000000 pennies weigh?
1000000000 pennies would weigh approximately 5511551 pounds or 2500000 kilograms.
Are us penney coins pure copper?
No, pre-1982 pennies are 95% copper and post-1982 pennies are made out of mostly zinc with a thing copper coating
A pre-1982 penny has a mass of 3.1 grams and a post 1982 penny has a mass of 2.5 grams How many pennies of each type are there if the mass of 20 of them is 61.16 grams?
Let x be the number of pre-1982 pennies and y be the number of post-1982 pennies. You can create a system of two equations based on the information given: 3.1x + 2.5y = 61.16 (total mass equation) x + y = 20 (total number of pennies) From there, you can solve for x and y to find out how many of each type of penny there are.
Is a US penny copper?
Pre-1982 pennies are made of bronze, which is 95% copper plus 5% tin and/or zinc. Post-1982 pennies are zinc with a thin coating of copper.
What is the formula for the post-1982 penny?
The post-1982 penny is made of 97.5% zinc and 2.5% copper.
What percent copper is a 1984 penny?
Next to none. Post-1982 pennies are only plated with copper, they are mostly zinc. The amount of copper on a post-1982 penny is miniscule and costs more to remove than melt value is.
How much does 4000 US pennies weigh?
One modern (post-1982) US cent weighs 2.5 grams, so 4,000 pennies weigh 10,000 grams, or 10 kg.
How many pounds of Pennys equals one dollar?
Presuming that you are asking about US Lincoln pennies, the answer is that it depends. If the pennies are pre-1982, they are 95% copper and 5% zinc and weigh 147 to the pound. If the pennies are post-1982, they are 2.5% copper and 97.5% zinc and weigh 181 to the pound. In 1982, both types were made. In 1943, pennies were made from steel coated with zinc (so-called "silver pennies" or "steel pennies") and in 1944 (and I think 1945 as well) from old brass shell casings, so their counts would be a bit different.
