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a penny has a hardness of 3 depending on what it is being scratched on.
There are two ways. One way is to buy a scratch test kit and follow the instructions. They will tell you to try to scratch minerals of certain hardnesses and find the hardest one it can scratch. For example, if it scratches a mineral with a hardness of 6 but not one with a hardness of 7, the hardness would be between 6 and 7. If you do not have one of those available, you can try scratching common objects. Your fingernail is 1.5, a penny is 2.5, a pocketknife blade is 5.0, window glass is 5.5, a steel file is 6.5, and quartz is 7.0.
The penny will be gone. You will also be gone with it, because getting close enough to a black hole to drop a penny inside it will catch you in its gravity well.
Google "Mohs hardness scale". This is a relative hardness scale which compares one mineral's hardness to another. (It is between 3.5 and 5.5 on the Mohs hardness scale)
Centimeter is to meter as a penny is to 1$
nickel
A topaz
Calcium
minearls
You can scratch any mineral against a mineral with a higher place. Talc maybe?
no
no
No
nickel
a penny has a hardness of 3 depending on what it is being scratched on.
Topaz,Calcite Cooprarte
topaz