David asks…
What is the specific heat capacity of the specimen?
A precious-stone dealer wishes to find the specific heat capacity of a 0.040-kg gemstone. The specimen is heated to 95.0°C and then placed in a 0.13-kg copper vessel that contains 0.072 kg of water at equilibrium at 25.0°C. The loss of heat to the external environment is negligible. When equilibrium is established, the temperature is 31.0°C.
admin answers:
Heat lost from the water and copper equals heat gained by gem.
Specific heat of water is 4.186 kJ/kgC
specific heat of copper is 386 J/kgC
4.186 kJ/kgC x 0.072 kg x (31–25) + 0.386 J/kgC x 0.13 kg x (31–25) = SH x 0.04 kg x (95–31)
1.808 + 0.301 = SH x 2.56
SH = 0.824 kJ/kgC or 824 J/kgC
edit, corrected arith
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James asks…
Do you believe in the power of the stones?
I was once obsessed with stones and I am not referring to precious stones like diamonds and rubies, etc....but the other stones not expensive. For instance the pink stone is supposed to bring you love. Those were my old days, but I wonder if anyone still belief these stones have some type of magnetic power over your life.
admin answers:
They are just rocks.
Laura asks…
Does it matter what type of tools I use for jewelry making?
I saw an ad for four tools for only $ 14. 95
and then an add for a "bead beamer" (3 tools in 1) for 19.99$
What all do I need for tools to make bracelets and necklaces?
and is it pretty easy to "crimp"?
And what's a good wholesale site for lots of semi-precious stones?
Do you make pretty good $ selling in person, if your a jewelry designer/beader?
admin answers:
There are several tools that are absolutely necessary to begin making jewelry. First, you'll need round nose pliers and chain nose pliers. You may also want to invest in flatnose pliers. You will also need diagonal wire cutters to trim extra wire from your projects. Others, such as crimping pliers, split-ring pliers, and bentnose pliars can be purchased later if you find you need them.
Bead reamers are used to smooth the holes in beads so they won't cut the wire, and also to enlarge the hole of the bead. You may need this eventually, but I wouldn't worry about getting it right away--and you can probably get it for a better price than $19.99.
For crimping--you can use crimping pliers, but make sure they are the right size for your crimp bead/tube. Personally, I just flatten the crimp with my chainnose pliers.
Www.firemountaingems.com is a great place to buy stones and supplies. Www.artbeads.com has great deals on Swarovski crystals, glass beads, and supplies.
I don't sell much jewelry (yet) because I don't have the time to devote to the business. I'll occasionally sell a piece to a friend or coworker, but I know others who have made a living by selling their work.
Charles asks…
Where is the best place to go prospecting for preciuous stones, diamond etc?
And would i need a special licence to do this,they say sierra leone, but i think there must be a safer place to go prospecting for precious stones,or is sierra leone as crazy as they say. thank you
admin answers:
It is crazy. There is a place in Arkansas that you can do it for a small fee. Try that first.
Donna asks…
Where is a good place to sell handcrafted Christian cross/crucifix sculptures?
I am currently working on a series of beautiful beadwork crosses in hand crafted wood frames. They are intended as table decorations or shrine centerpieces and are crafted of imported exotic woods and precious and semi-precious stone beads. The retail price will likely be $200-$300, depending on size. I'm not sure where the best place to showcase them online would be. Does anyone have any suggestions? Thanks!
admin answers:
List them all at http://www.houseofnothing.com for free... You can even have your own store front
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