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What is the classification of a rock that cannot ba scratched with a fingernail but can be scratched with a coin?
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Is coin a mass noun?
No, the noun 'coin' is a countnoun, the plural form is coins (one coin, six coins).
What does aging do to a coin's mass?
When a coin ages it lowers the mass of a coin because usually some of the metal such as copper on a penny comes off the coin leaving it with a lighter mass then it started off with.
A coin is placed on a very hot rock how will most of the heat be transferred to the coin?
Molecules in the rock will transfer heat to molecules in the coin through direct contact.
Why will the coin drop into the glass when a force accelerates the card?
due to the coin 's inertia. when the paper the coin tries to maintain their state of rest so it falls in the cup :D
What will happen if you flip a coin in a high speed airplane and why?
Nothing unusual IF the airplane is flying level and at a constant speed. The coin will go up, flip, and come down as expected. However, if the airplane is accelerating...in ANY direction, the path of the coin will appear to be altered once it is in the air. For instance if the plane dives as the coin is thrown, the coin will appear to accelerate in the Upward direction.
What mineral has the same hardness as a fingernail?
GypsumHardnessMineralAssociations and Uses1Talc (Softest)Talcum powder. (can be scratched by a fingernail.)2GypsumPlaster of paris.Gypsum is formed when seawater evaporates from the Earth's surface. (May be scratched by a fingernail or by a copper coin.)3CalciteLimestone and most shells contain calcite.(Can be scratched by a steel pocket knife or sometimes a copper coin. Will scratch a fingernail, may scratch a copper coin.)4FluoriteFluorine in fluorite prevents tooth decay.(Can be scratched by a steel pocket knife. Will scratch a fingernail and a copper coin.)5ApatiteWhen you are hungry you have a big "appetite".(Can be scratched by a steel pocket knife. Will scratch a fingernail and a copper coin.)6OrthoclaseOrthoclase is a feldspar, and in German, "feld" means "field".(Will not scratch glass but will scratch steel blades, copper coins & fingernails.)7Quartz (Will scratch glass, steel blades, copper coins & fingernails.)8TopazThe November birthstone. Emerald and aquamarine are varieties of beryl with a hardness of 8. (Will scratch glass, steel blades, copper coins & fingernails.)9CorundumSapphire and ruby are varieties of corundum. Twice as hard as topaz.(Will scratch glass, steel blades, copper coins & fingernails.)10Diamond (hardest)Used in jewelry and cutting tools. Four times as hard as corundum.(Will scratch all of the above.)
What minerals can be scratched with a copper coin?
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What is the resistance of a mineral has to being scratched called?
The resistance of a mineral to being scratched is known as its 'hardness'. This is a relative measurement determined by whether it scratches, or is scratched by, other materials of determined hardness. Hardness is measured on the Mohs scale. To give to some idea, diamond (the hardest known mineral) is a 10, while talc (the softest) is 1. A copper coin is around 3, a fingernail is around 2, an iron nail is around 5. Quartz, for example, is a 7.
How do you determine value of a coin?
you see what it is worth by seeing how shiny it is how old it is and if it is not scratched up then you bring it to a coin professional
How did they remove Caesar's coins?
Well they just scratched his face of the coin boob
How do you tell if a coin is circulated?
You probably got it as change when you broke a bill. Its also scratched up and dirty.
How much would a scratched up 1900 penny and a mint condition 1902 penny be worth pooled together?
The scratched coin is probably worth less than $1. Depending on the amount of tarnish if any on the 1902 coin, its retail value as of 07/2008 could be anywhere from $20 to $30.
How do you make coin a UFO?
This is logically impossible. if you know its a coin it cannot be unidentified. for it is a coin!
What is the value of a sitting liberty 1854 quarter scratched?
It depends on the grade of the coin and how bad and were the scratch is, take it to a dealer for an assessment.
If you rub a coin briskly between your fingersit will not seem to become charged by frictionwhy?
because coin is made up of insulated metal thats why coin cannot charged
How do you crease paper without it bunching up?
you fold it in the direction and neatly use something hard like a fingernail or coin to fold the paper even more
What are the top ten hardest stones in the world?
I am not an expert, but I was interested to know this answer myself, a while ago. My research led me to this:Stones harder than Steel1. Diamond - the hardest mineral on earth;2. Corundum* (depending on color: Ruby, Padparadscha, sapphire);2. Diorite* (not a precious stone, therefore rarely mentioned);3. Chrysoberyl (depending on color: Alexandrite, Cat's Eye or Cymophane);4. Granite (not a precious stone, therefore rarely mentioned);5. Topaz;6. Quartz;7. Feldspar;All the above stones are stronger than steel.8. Apatite (can be scratched by steel);9. Fluorite (can be scratched by steel);10. Calcite (can be scratched by a coin);The following two can be scratched by fingernail:11. Gypsum;12. Talc;*I'm still trying to find out if Corundum is harder than Diorite, or vice-versa.
