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Why dsn't it happen? —The preceding unsigned comment was added by Bastard Soap ( talk • contribs) 00:34, 28 April 2007 (UTC).
Methane clathrate is a crystal, not exactly what I was looking for, but thanks anyway it was an interesting read. I made a mistake, it's the hydration of carbon tetrachloride. At school it was said that it has to do with the d orbital but in the article orbitals are not mentioned, it is said that it is steric hindrance. Can anyone clear things up a bit? Bastard Soap 10:43, 28 April 2007 (UTC)
on the artical about topfuel dragsters it states
"Power output of these engines is most likely somewhere between 6000 and 8000 horsepower (approximately 4500-6000 kilowatts). This is calculated from performance as a dynamometer capable of measuring power output of these magnitudes has yet to be built. This would suggest a torque output of 5100-6750 Nm (3760-4980 lb-ft) and also a brake mean effective pressure of 80-100 bar."
I asume horsepower in that case was calculated by how much work the car did over a period of time. w=fxd P=w/t That being the case, how was the torque figure calculated?
furthermore it has come to my attention that at an rpm of 5252 the torque and horsepower of an engine are equal, if there is such a thing.....
Thanks for responding, it cleared up some confusion I had.
Hi there, I got seven questions.
1. What are Intermediate products?
2. Raw materials are the materails that are consumed in the net reaction. What are the raw materials for the Solvay process? Where are these raw materials obtained? What makes these materials suitable for a large-scale chemical process?
3. The primary products and the byproducts of a chemicalprocess depend on how marketable the products are. What are the primary products and byproducts of the Solvay process?
4. What intermediate product in the Solvay processis highly marketable? What are some consequences of removing this intermediate from the system of reactions?
5. Resources other than chemical and technological resources are required for most chemical processes. What additional natural resources are needed for the Solvay process?
6. Large quantities are used in newer processing plants that are built on what is called a world scale to produce quantities for international distribution. Why do you think chemical plants are being built on an increasingly large scale?
If you going to tell me to read Solvay process article, well, you better show me which line says what.
Thanks. —The preceding unsigned comment was added by 76.64.132.195 ( talk) 03:56, 28 April 2007 (UTC).
In which part of the article? Byproducts or what?
Is there website where you can put a chemical equation and it will show you the balance? Thanks —The preceding unsigned comment was added by 76.64.132.195 ( talk) 03:58, 28 April 2007 (UTC).
Are there any viruses or bacteria that exist in a liquid or gaseous state (not meaning in a liquid or gaseous medium) or do they only exist in a solid state? Nebraska Bob 06:20, 28 April 2007 (UTC)
Hi
I need to analyse the sequential muscle contraction of an overarm throwing action, including joints. It has to include the function of the muscles, concentric or eccentric contraction, which muscles act as stabilizing muscles etc. I have no idea where to start and couldn't find any info... Please help.
Mike 196.23.232.64 09:16, 28 April 2007 (UTC)
Is it true that a funeral home or morgue has to wait 72 hours before a body can be buried after a person is pronounced dead and during the 72 hours the body has to be monitored by sensors to determine if there are any remaing signs of life? 71.100.8.252 11:34, 28 April 2007 (UTC)
To make sure people can be shot between the eyes, or cremated. Or you could drive a stake through their heart and scatter rose seeds around the grave.
This was in a past paper, and I don't know how to do it. There is a diagram of a titration with a burette containing sulphuric acid, 0.20 mol/l and a conical flask with 20cm3 of potassium hydroxide solution and indicator; and a table of results:
_ | Rough titre | 1st titre | 2nd titre |
---|---|---|---|
Initial burette reading/cm3 | 0.5 | 21.7 | 0.3 |
Final burette reading/cm3 | 21.7 | 42.4 | 20.8 |
Volume used/cm3 | 21.2 | 20.7 | 20.5 |
The first question I can get easily (what everage volume should be used to calculate the number of moles of sulphuric acid needed to neutralise the potassium hydroxide solution): 20.6cm3.
The second part I can get fine, which is calculate the number of moles of sulphuric acid in this average volume: n = CV = 0.20 * (20.6*1000) = 0.00412 mol.
Finally, and this is the part I cannot get. The equation for the titraion is:
Calculate the number of moles of potassium hydroxide in 20cm3 of potassium hydroxide solution. Any ideas are much appreciated. Thank you. 81.154.211.80 12:39, 28 April 2007 (UTC)
Could you, please, cite some direct applications of linear algebra in the natural sciences? Thanks. -- Taraborn 14:38, 28 April 2007 (UTC)
Insert non-formatted text here respected madam/sir
like i would like to know exactly is ther any formula to caluclate the turns ratio of the secondary winding it the current sensors .the details given below
originally we use an current sensor with input current of 5000A with an output of 1705 milli Amps with the turns of 6000 in the secondary,so i want to modify it with decreasing the input current to the required level and making the output constant(1705) so please guide me in this and i would like to know the relation how to caluclate the secondary windings when we are using an hall effect non contact type current sensors
lokking for ward for your reply.
thanks & regards, —The preceding unsigned comment was added by 202.63.119.180 ( talk) 16:31, 28 April 2007 (UTC).
The wing on the Koenigsegg CCGT is said to have the NACA 632 profile [9]. However, as far as I can see, the article does not mention any three-digit profiles. Does "NACA 632" exist or is it a typo? — Bromskloss 16:36, 28 April 2007 (UTC)
When comparing two Gausian peaks, do the peak heights correlate with the areas under the two curves? Where would I go to find this answer?-- 130.126.228.60 16:53, 28 April 2007 (UTC)
If one has fit a pair of peaks that were each fit to a Gaussian, how does one determine their relative areas? I think that is the question being posed. Does one need only compare peak heights or what calculation exactly is required to get the two areas?-- Smokefoot 18:22, 28 April 2007 (UTC)
There has been a fact abouth the geology of earth, that always puzzled me, but I neved noticed it enough to ask the obvious question. Take a look at this diagram: http://en.wikipedia.org/wiki/Image:Earth_elevation_histogram.svg.
You can see that few areas are mountains, few are deep see trenches and almost all of the surface area on earth is either flat land from -200 to 1000 meters or deep see from -2000 to -6000 meters. There is a small costal shelf followed by a steep cliff and a deep ocean.
Why? What is the reason for the existence of the little bump, that cliff in this diagram that gives us so much more habitable land than we should expect?
Does anyone know where I can find a chart of all the current spacecraft in the solar system outside of Earth orbit with their location and vectors noted ? It would be similar to this one [10], but would include all spacecraft, including non-NASA ships. StuRat 17:29, 28 April 2007 (UTC)
A subject is placed in an environment where all ambient noise of a sufficient loudness is automatically recorded and stored in a sampler. At frequent intervals, the sampler plays the recordings back as music. After the subject has spent some time in that environment, he is then removed to a "normal" environment with no such sound manipulation. The subject then reports a subjective perception that "the music is still there" and he claims to hear everything as including some kind of musicality. Eventually this fades.
TIA. dr.ef.tymac 17:59, 28 April 2007 (UTC)
My audio system merely uses 100 watts of electric energy but the labels on the speakers show 1500 watts.Where does such power come from? —The preceding unsigned comment was added by 202.70.64.15 ( talk) 18:19, 28 April 2007 (UTC).
Also, power for audio amplifiers is usually specified with Total Harmonic Distortion percentage. Depending on the output stage of the amplifier (Class A preferably, Class AB probably more common), the distortion is reduced with percentage of total power. Therefore, for a given loudness, a 200 Watt amplifier will generally have less distortion than a 100 Watt amplifier. When comparing amplifier's the power number matters when the THD is the same. This is the reason why amplifier power matters and also why THD is also relevant when comparing two amplifieres. Beware of the 150W 0.1% THD compared to the 100W 0.05% THD. They could very well be the exact same amplifier. Likewise, the difference between a 200W 0.05%THD amplifier and a 100W 0.05% THD might be very noticeable not for volume but because the THD of the 200W amplifier running at 100W should be significantly better than the 100W amplifier running at 100W. It's not louder, it's cleaner. -- Tbeatty 03:32, 29 April 2007 (UTC)
Hi, I have two questions. The first regards the capillary threads/tubes that exist in trees. These are super-smart, super-thin threads that don't actually spend any energy at all on carrying water from the soil, up the trunk of the tree. Since this is making use of surface tension, I was thinking if this could be used in a closed system to produce electricity.
Basically the idea is to have a standard dynamo connected to a watermill, on which water falls from a pool above. The water then flows into a large pool that surrounds this watermill, where millions, maybe billions of tiny such capillary threads made of glass or similar are. The water gets sucked extreeeemely slowly up this way, before it reaches the top pool, and falls down on the watermill again. Even if the watermill was made from super-light material, you'd no doubt need a wast quantity of such threads. My question, if I haven't asked it yet, is if there's any future in this? I realize it would have to take a blasted lot of room... :)
The second question is, does Wikipedia have an article on inventions that are meant to last forever, perpetuum inventione or something like that? Thanks for all help! :) 81.93.102.185 18:58, 28 April 2007 (UTC)
I have read in some popular science publication that inflation ended when the size of the universe was about the size of a baseball. Can you give me a technical publication reference which discusses this matter?
Thank You,
Alfred Bussian Bussian 19:52, 28 April 2007 (UTC) <email address redacted>
As an aside, does it mean anything to talk about the size of the universe at such an early stage? What does "Size of a baseball" mean when matter/energy will warp space time to such an extent? what about time in the early universe? (i.e. talking about the universe in the first bilionth of a second - does it mean anything? ). -- Tbeatty 02:32, 29 April 2007 (UTC)
Science desk | ||
---|---|---|
< April 27 | << Mar | April | May >> | April 29 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Why dsn't it happen? —The preceding unsigned comment was added by Bastard Soap ( talk • contribs) 00:34, 28 April 2007 (UTC).
Methane clathrate is a crystal, not exactly what I was looking for, but thanks anyway it was an interesting read. I made a mistake, it's the hydration of carbon tetrachloride. At school it was said that it has to do with the d orbital but in the article orbitals are not mentioned, it is said that it is steric hindrance. Can anyone clear things up a bit? Bastard Soap 10:43, 28 April 2007 (UTC)
on the artical about topfuel dragsters it states
"Power output of these engines is most likely somewhere between 6000 and 8000 horsepower (approximately 4500-6000 kilowatts). This is calculated from performance as a dynamometer capable of measuring power output of these magnitudes has yet to be built. This would suggest a torque output of 5100-6750 Nm (3760-4980 lb-ft) and also a brake mean effective pressure of 80-100 bar."
I asume horsepower in that case was calculated by how much work the car did over a period of time. w=fxd P=w/t That being the case, how was the torque figure calculated?
furthermore it has come to my attention that at an rpm of 5252 the torque and horsepower of an engine are equal, if there is such a thing.....
Thanks for responding, it cleared up some confusion I had.
Hi there, I got seven questions.
1. What are Intermediate products?
2. Raw materials are the materails that are consumed in the net reaction. What are the raw materials for the Solvay process? Where are these raw materials obtained? What makes these materials suitable for a large-scale chemical process?
3. The primary products and the byproducts of a chemicalprocess depend on how marketable the products are. What are the primary products and byproducts of the Solvay process?
4. What intermediate product in the Solvay processis highly marketable? What are some consequences of removing this intermediate from the system of reactions?
5. Resources other than chemical and technological resources are required for most chemical processes. What additional natural resources are needed for the Solvay process?
6. Large quantities are used in newer processing plants that are built on what is called a world scale to produce quantities for international distribution. Why do you think chemical plants are being built on an increasingly large scale?
If you going to tell me to read Solvay process article, well, you better show me which line says what.
Thanks. —The preceding unsigned comment was added by 76.64.132.195 ( talk) 03:56, 28 April 2007 (UTC).
In which part of the article? Byproducts or what?
Is there website where you can put a chemical equation and it will show you the balance? Thanks —The preceding unsigned comment was added by 76.64.132.195 ( talk) 03:58, 28 April 2007 (UTC).
Are there any viruses or bacteria that exist in a liquid or gaseous state (not meaning in a liquid or gaseous medium) or do they only exist in a solid state? Nebraska Bob 06:20, 28 April 2007 (UTC)
Hi
I need to analyse the sequential muscle contraction of an overarm throwing action, including joints. It has to include the function of the muscles, concentric or eccentric contraction, which muscles act as stabilizing muscles etc. I have no idea where to start and couldn't find any info... Please help.
Mike 196.23.232.64 09:16, 28 April 2007 (UTC)
Is it true that a funeral home or morgue has to wait 72 hours before a body can be buried after a person is pronounced dead and during the 72 hours the body has to be monitored by sensors to determine if there are any remaing signs of life? 71.100.8.252 11:34, 28 April 2007 (UTC)
To make sure people can be shot between the eyes, or cremated. Or you could drive a stake through their heart and scatter rose seeds around the grave.
This was in a past paper, and I don't know how to do it. There is a diagram of a titration with a burette containing sulphuric acid, 0.20 mol/l and a conical flask with 20cm3 of potassium hydroxide solution and indicator; and a table of results:
_ | Rough titre | 1st titre | 2nd titre |
---|---|---|---|
Initial burette reading/cm3 | 0.5 | 21.7 | 0.3 |
Final burette reading/cm3 | 21.7 | 42.4 | 20.8 |
Volume used/cm3 | 21.2 | 20.7 | 20.5 |
The first question I can get easily (what everage volume should be used to calculate the number of moles of sulphuric acid needed to neutralise the potassium hydroxide solution): 20.6cm3.
The second part I can get fine, which is calculate the number of moles of sulphuric acid in this average volume: n = CV = 0.20 * (20.6*1000) = 0.00412 mol.
Finally, and this is the part I cannot get. The equation for the titraion is:
Calculate the number of moles of potassium hydroxide in 20cm3 of potassium hydroxide solution. Any ideas are much appreciated. Thank you. 81.154.211.80 12:39, 28 April 2007 (UTC)
Could you, please, cite some direct applications of linear algebra in the natural sciences? Thanks. -- Taraborn 14:38, 28 April 2007 (UTC)
Insert non-formatted text here respected madam/sir
like i would like to know exactly is ther any formula to caluclate the turns ratio of the secondary winding it the current sensors .the details given below
originally we use an current sensor with input current of 5000A with an output of 1705 milli Amps with the turns of 6000 in the secondary,so i want to modify it with decreasing the input current to the required level and making the output constant(1705) so please guide me in this and i would like to know the relation how to caluclate the secondary windings when we are using an hall effect non contact type current sensors
lokking for ward for your reply.
thanks & regards, —The preceding unsigned comment was added by 202.63.119.180 ( talk) 16:31, 28 April 2007 (UTC).
The wing on the Koenigsegg CCGT is said to have the NACA 632 profile [9]. However, as far as I can see, the article does not mention any three-digit profiles. Does "NACA 632" exist or is it a typo? — Bromskloss 16:36, 28 April 2007 (UTC)
When comparing two Gausian peaks, do the peak heights correlate with the areas under the two curves? Where would I go to find this answer?-- 130.126.228.60 16:53, 28 April 2007 (UTC)
If one has fit a pair of peaks that were each fit to a Gaussian, how does one determine their relative areas? I think that is the question being posed. Does one need only compare peak heights or what calculation exactly is required to get the two areas?-- Smokefoot 18:22, 28 April 2007 (UTC)
There has been a fact abouth the geology of earth, that always puzzled me, but I neved noticed it enough to ask the obvious question. Take a look at this diagram: http://en.wikipedia.org/wiki/Image:Earth_elevation_histogram.svg.
You can see that few areas are mountains, few are deep see trenches and almost all of the surface area on earth is either flat land from -200 to 1000 meters or deep see from -2000 to -6000 meters. There is a small costal shelf followed by a steep cliff and a deep ocean.
Why? What is the reason for the existence of the little bump, that cliff in this diagram that gives us so much more habitable land than we should expect?
Does anyone know where I can find a chart of all the current spacecraft in the solar system outside of Earth orbit with their location and vectors noted ? It would be similar to this one [10], but would include all spacecraft, including non-NASA ships. StuRat 17:29, 28 April 2007 (UTC)
A subject is placed in an environment where all ambient noise of a sufficient loudness is automatically recorded and stored in a sampler. At frequent intervals, the sampler plays the recordings back as music. After the subject has spent some time in that environment, he is then removed to a "normal" environment with no such sound manipulation. The subject then reports a subjective perception that "the music is still there" and he claims to hear everything as including some kind of musicality. Eventually this fades.
TIA. dr.ef.tymac 17:59, 28 April 2007 (UTC)
My audio system merely uses 100 watts of electric energy but the labels on the speakers show 1500 watts.Where does such power come from? —The preceding unsigned comment was added by 202.70.64.15 ( talk) 18:19, 28 April 2007 (UTC).
Also, power for audio amplifiers is usually specified with Total Harmonic Distortion percentage. Depending on the output stage of the amplifier (Class A preferably, Class AB probably more common), the distortion is reduced with percentage of total power. Therefore, for a given loudness, a 200 Watt amplifier will generally have less distortion than a 100 Watt amplifier. When comparing amplifier's the power number matters when the THD is the same. This is the reason why amplifier power matters and also why THD is also relevant when comparing two amplifieres. Beware of the 150W 0.1% THD compared to the 100W 0.05% THD. They could very well be the exact same amplifier. Likewise, the difference between a 200W 0.05%THD amplifier and a 100W 0.05% THD might be very noticeable not for volume but because the THD of the 200W amplifier running at 100W should be significantly better than the 100W amplifier running at 100W. It's not louder, it's cleaner. -- Tbeatty 03:32, 29 April 2007 (UTC)
Hi, I have two questions. The first regards the capillary threads/tubes that exist in trees. These are super-smart, super-thin threads that don't actually spend any energy at all on carrying water from the soil, up the trunk of the tree. Since this is making use of surface tension, I was thinking if this could be used in a closed system to produce electricity.
Basically the idea is to have a standard dynamo connected to a watermill, on which water falls from a pool above. The water then flows into a large pool that surrounds this watermill, where millions, maybe billions of tiny such capillary threads made of glass or similar are. The water gets sucked extreeeemely slowly up this way, before it reaches the top pool, and falls down on the watermill again. Even if the watermill was made from super-light material, you'd no doubt need a wast quantity of such threads. My question, if I haven't asked it yet, is if there's any future in this? I realize it would have to take a blasted lot of room... :)
The second question is, does Wikipedia have an article on inventions that are meant to last forever, perpetuum inventione or something like that? Thanks for all help! :) 81.93.102.185 18:58, 28 April 2007 (UTC)
I have read in some popular science publication that inflation ended when the size of the universe was about the size of a baseball. Can you give me a technical publication reference which discusses this matter?
Thank You,
Alfred Bussian Bussian 19:52, 28 April 2007 (UTC) <email address redacted>
As an aside, does it mean anything to talk about the size of the universe at such an early stage? What does "Size of a baseball" mean when matter/energy will warp space time to such an extent? what about time in the early universe? (i.e. talking about the universe in the first bilionth of a second - does it mean anything? ). -- Tbeatty 02:32, 29 April 2007 (UTC)