its 10000kg
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No 1964 silver quarter should have a copper layer and they all should be 90% silver, although it is possible that your quarter has tarnished or toned odd and just appeared to look non-silver. Both copper-nickel clad and silver quarters were produced in the mid-1960s with the clad ones being dated 1965 and later while the silver ones were dated 1964, so theoretically it could be struck on a copper-nickel planchet. I would weigh the coin, a silver one should weigh about 6.25 grams (naturally a worn quarter would weigh less) while a copper-nickel one should weigh much less, about 5.67 grams.
Modern copper-nickel dimes weigh 2.27 gm. Older (1964 and earlier) 90% silver dimes weighed 2.5 gm.
If you weighed 100 lbs on Earth you would weigh 112.5 lbs on Neptune.See related for how much you would weigh on other planets.
38000 copper pennies would weigh approximately 94.7 kilograms or 209 pounds.
A steel plate of that size would weigh approximately 368 pounds.
7.395 lbs.
~3.3oz
Copper pennies minted before 1982 weigh 3.11 grams.
8.89 grammes.
its 10000kg
~3.3oz
It weigh about as much as a bowl of spaghetti
It is impossible to give an answer. For instance, a metre of copper wire, or a metre of a copper ingot?
Since the composition of pennies changed in 1982 from 95% copper to 2.5% copper, the amount of copper in 300 pennies would depend on the year they were minted. Pre-1982 pennies would contain about 2.3 pounds of copper, while post-1982 pennies would only contain about 0.375 pounds of copper.
The value is determined by weight. Copper is currently about $3.75/pound, so weigh your copper and do the math.