Coal Definition and 68 Threads

How many pounds of western subbituminous coal would be needed to heat the house (house requires 1,000,000 BTU), with a 60% efficient furnace? Subitiminous coal = 10,750 BTU/lb 1,000,000 BTU ____________ = 93.02 lb of coal. 10,750 Btu/lb And I am not exactly sure how...

Futuregen was the DOE's clean coal, carbon capture, and hydrogen production prototype plant all rolled into one. Started in 2003, DOE http://blogs.wsj.com/environmentalcapital/2008/02/06/futuregen-fight-gloves-off/?mod=googlenews_wsj" it had enough of the big bang project, it was busting its...

Fareed Zakaria, the former host of Foreign Exchange, on PBS, made about the silliest statement that I've ever heard from a PBS news show host [maybe this is why he recently stopped hosting the show - he got canned as a kook]. He argues that if we don't pay China to not burn coal, they will burn...

http://www.celsias.com/2007/11/23/nanosolars-breakthrough-technology-solar-now-cheaper-than-coal/ So says this company. I'm skeptical though, I don't have a decent background in electrical engineering or...well...anything outside of astrophysics really to tell if its worth it. Seems very...

Coal is Glowing here! I got this question in Resnick Eisberg: Pockets formed in a coal fire seem brighter than the coals themslves.Is the temperature in such pockets appreciably higher than the temperature of an exposed glowing coal? Strictly speaking,I have never observed this...however...

This week there were 100 people killed in a single coal mine explosion in the Ukraine. http://www.washingtonpost.com/wp-dyn/content/article/2007/11/18/AR2007111800127.html?hpid=sec-world"there were about 31 people killed in the Chernobyl explosion and aftermath. AM

The other black gold. Could we screw up the environment any worse than this? Strip mines are bad enough, but surface mining on hillsides and hilltops is not compatible with land reclamation. http://www.iht.com/articles/2007/08/23/europe/coal.php...

Homework Statement A railroad hopper car weighs 20000 kg when empty and contains 10000 kg of coal. As it coasts along the track at 9 m/s the hopper opens and steadily releases all the coal onto a platform below the rails over a period of 5 s. Homework Equations d) If the coal fell 5 m...

I visited a coal power plant on the weekend, and was quite impressed by the scale and enormity of the operation. 10 storey high boilers suspended from the ceiling, Turbines and generators the size of two semi trailers, etc. (I highly recommend it if you can spare the time) Unfortunately our...

This is in no way a suggestion; I'm just curious. Please read on. A friend of mine has a house that is heated by burning wood. I won't give his entire story, but he did include that burning wood for heat is significantly cheaper than burning natural gas, which makes it way way cheaper than...

I've always wondered how people are able to walk on hot coal without suffering from burns. Moreover, earlier, a teacher demonstrated to my class how if one spills liquid nitrogen on one's hand in open air that one does not suffer from frostbite, but only feels the cold temperature. I got...

Does anyone know the difference? Specs and such? Thanks

At a steam power plant, steam engines work in pairs; the rejected heat from the first is the heat input to the second. The operating temperatures of the first are 670 C and 440 C. The operating temperatures of the second are 440 C and 290 C. Assume both engines work at 60% of their Carnot...

A railroad hopper car has mass 50000 kg when empty and contains 50000 kg of coal. As it coasts along the track at 10 m/s the hopper opens and steadily releases all the coal onto a platform below the rails over a period of 4 s. How fast does the car travel after all the coal is dumped? i...

Coal Tar...wtf? This experiment I am going to be working on calls for some coal tar. I have no clue where to get some besides trying to separate it out of shampoos and soaps. Any hints? Or what i can use instead of Coal Tar.

Hey everyone, just wondering if anyone can help me out with a homework question I'm having trouble with. I've been stuck on it for about 45 minutes now, any help will be appreciated. Thanks. "A conveyor belt is driven by a motor rated at 60kW. Only 90% of the rated power is available for...

What is the "Coal Vein"? I've just heard this term, and am almost completely ignorant as to its meaning. What is the defintion of the "coal vein"? Where is it found? Any information (or a link) about the "coal vein" is appreciated.

Hello! A coal fired plant generates 600MW of electric power. The plant uses 4.8x10^6kg of coal a day. The heat of combustion is 3.3x10^7 J/kg. The steam that drives the turbines is at temp of 300 degrees C and the exhaust water is at 37 degrees C. Whar is the overall effiecy of the plant...