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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.
How much does 1000000000 pennies weigh?
It depends if you are talking about pre-1982 pennies or post-1982 pennies.
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.
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
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.
Post 1982 pennies were made of what type of metal?
Zinc with a thin outer layering of copper
What is the formula for the post-1982 penny?
If by formula you mean composition, a post-1982 penny is 97.5% Zinc and 2.5% Copper by mass.
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.
Why do pennies from the 1970's have a greater mass than pennies from the 1990's?
Because Lincoln cents until 1982 (Some 1982 cents are copper, others are zinc) were struck in 95% copper, starting in 1982 they are made of mostly zinc with a small plating of copper. Since copper has a greater mass than zinc they weigh more. Copper pennies are also worth more than zinc pennies, if it was legal to melt them down, you could get about 2 cents for every copper penny but only about half a cent in scrap for zinc pennies. However, at the time being it is illegal to melt down US pennies in the US or export them to be melted down.
