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According to the Helium article, it the 2nd most abundant element in the universe, but not really very abundant at all on Earth. Why? Is simply because molecular helium tends to rise in the atmosphere and escape into space? Or is there some deeper reason for scarcity of He on Earth? ike9898 03:40, 28 October 2006 (UTC)
I know that it is possible to take pictures of the sun that actually some 'detail', that is, they show 'surface ripples' rather than just a featureless disk of light. My question is, with any existing equipment (including the Hubbel telescope), could you produce an image of a star, other than the sun, that actually shows some of this detail? If not, would this be possible with any instrument that could be built within, say, the next 25 years? ike9898 04:36, 28 October 2006 (UTC)
I've left an ice pack in the back of my car for a while, and not only has it burst, it's dried out. The remaining contents are some kind of crystalline-type stuff, and where they've "set" in the carpet they're damned difficult to remove. Does anybody know a) what the stuff is, and b) any suggestions for removing it more effectively than water? -- Robert Merkel 05:23, 28 October 2006 (UTC)
I am writing about salt water. Questions:
All (nice) salt water beaches have fresh water showers. Salt is yucky on the skin. The new trend is for saline swimming pools, but this concentration is much less than ocean water. -- Zeizmic 14:40, 28 October 2006 (UTC)
In places where fresh water is scarce, one approach is to bathe or wash clothes or dishes in salt water, but then rinse in fresh water, to eliminate the salt water residue. Food may also be cooked in salt water. Note that salt water from the sea has life forms and debris in it, too, which can clog pipes. Filtering the water helps, but the filters will soon clog, as well. One approach is to clean the pipes using a "pig", a large slug rammed down the pipe to scrape the sides clean, on a regular basis. StuRat 15:26, 28 October 2006 (UTC)
Hello,
Could somebody please help me with the name of a picture viewing machine, widely prevalent in India in the 1960s and 70s (maybe earlier and in other places too) where a record used to be played on a grammophone and kids looked through peepholes, 5 or 6 of them around a cylindrical (or polygonal) base. inside were pictures pasted on a coaxial polygon which rotated as the operator turned a crank. the whole thing rested on a table or tripod and could be packed and carried on the head.
will a picture along with the name be too much to ask for?
i have tried bioscopes but the images i'm getting on the net are not the ones i mean.
thanks in advance for the trouble.
regards
Kushal, Chennai, India
thanks for taking the trouble, though i'm afraid i'm still searching. am adding a few more clarifications that might help. > it was always (at least all i've seen) topped with a victrola - so its more of a fairground kinda machine than a serious photo viewing device. > it was larigish, lets say about a 3/4m across. > the pics seen were definitely still iamges(and meant to be so) > the peepholes had lenses on them and were covered with a lid on the outside when not in use> and finally its the theme in the latest compaq ad by shah rukh khan as being shown on tv channels in india
sorry again for the trouble, but its driving me nuts!
I am doing an experiment where I am seeing what enzyme will tenderize meat the fastest. I need a concentration/percentage that is very close. For example, if the sample of papain contains 97% of papain as the main ingredient,then ficin should be very close to that amount.
I would appreciate if anyone would know where I could purchase these digestive enzymes:
Papain (Papaya), Bromelain (Pineapple), Ficin (Figs) and Actinidin (Kiwi). Preferrably in powder form, since it would be hard to know the amount of the enzyme in each piece of fruit.
The problem I am finding is that the Health Stores only carry Papain and Bromelain and some of the biochemical companies sell only industrial size.
Would any universities carry them?
Thanks,
JDC
Hello, I was reading the Wikipedia article on the neutrino and noticed the mention that it might be the same particle as the antineutrino. There wasn't a very good explanation as to why this would be so that I could find, so I was wondering if someone could give an explanation. Thanks! Andromeda321 16:00, 28 October 2006 (UTC)
Hi there
is there a simple and clear way of understanding dependent variables and independent variables? I am 49 years of age, studying for a Single Hons Degree in Psychology, but Research Methods defeats me - especially understanding what these variables are and how to use them. Have had discussions with fellow students and a one to one session with a student taking his Phd. Am tearing my hair out, given so many examples but do not understand any of them. Please somebody help this thick old woman!!!!!!!!! Carole D
even though i could get lot of information about control system but the subjects which are in continution to it like Discrete Control System,Optimal control system, Adaptive Control System,Computer Adied Designe Of Control System , i am unable to get information about these subjects. can you suggest me how to get the notes of these subjects.
202.63.109.234 16:52, 28 October 2006 (UTC)imran (A.C.E.T)
respected sir, im an engineering student and i would like to know how to create an artificial force field. for many good reasons keeping in view the defence system of every country.by using artificial force fieldis it possible to convert the energy grabbed by the object to the potential energy of the system and can be re imparted energy to thre object.its a very typical question.so i would be needing ur help to get out of this problem.hope to seek the answer soon. —The preceding unsigned comment was added by Punitmalpani007 ( talk • contribs) .
I'm thinking about making yeast bread, but I like to buy my food by price-per-unit-weight. How much mass does yeast consume in producing carbon dioxide, assuming the standard practice of letting the dough double in volume? What would be the most cost-effective way to do this? Black Carrot 18:52, 28 October 2006 (UTC)
I have often heard that soy is the only vegetable source of complete protein; however, I have also heard this claim made for certain grains such as buckwheat, quinoa, and amaranth. I found a ref for quinoa, but am having trouble for the others. Does anybody know of any reliable sources that can tell me once and for all which, if any, vegetable proteins are complete? -- Ginkgo100 talk · e@ 20:58, 28 October 2006 (UTC)
For clarification, may we assume in a dietary context a "complete protein" is one which contains all essential amino acids? alteripse 14:40, 29 October 2006 (UTC)
How many valence electrons does oxygen have? 71.97.11.77 21:25, 28 October 2006 (UTC)nicholassayshi
Six. Why do you ask? Theresa Knott | Taste the Korn 21:51, 28 October 2006 (UTC)
It doesn't say in the web site. 71.97.11.77 22:08, 28 October 2006 (UTC)nicholassayshi
Who can explain to me why, when you look along a tarmac or asphalt road on a hot day, you see a shimmering, mirrored effect in the distance. I presume its heat related and is the same effect that produces shimmering in the desert, but what is the exact mechanism? Thanks. Rockpocke t 21:26, 28 October 2006 (UTC)
Science desk | ||
---|---|---|
< October 27 | << Sep | October | Nov >> | October 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. |
According to the Helium article, it the 2nd most abundant element in the universe, but not really very abundant at all on Earth. Why? Is simply because molecular helium tends to rise in the atmosphere and escape into space? Or is there some deeper reason for scarcity of He on Earth? ike9898 03:40, 28 October 2006 (UTC)
I know that it is possible to take pictures of the sun that actually some 'detail', that is, they show 'surface ripples' rather than just a featureless disk of light. My question is, with any existing equipment (including the Hubbel telescope), could you produce an image of a star, other than the sun, that actually shows some of this detail? If not, would this be possible with any instrument that could be built within, say, the next 25 years? ike9898 04:36, 28 October 2006 (UTC)
I've left an ice pack in the back of my car for a while, and not only has it burst, it's dried out. The remaining contents are some kind of crystalline-type stuff, and where they've "set" in the carpet they're damned difficult to remove. Does anybody know a) what the stuff is, and b) any suggestions for removing it more effectively than water? -- Robert Merkel 05:23, 28 October 2006 (UTC)
I am writing about salt water. Questions:
All (nice) salt water beaches have fresh water showers. Salt is yucky on the skin. The new trend is for saline swimming pools, but this concentration is much less than ocean water. -- Zeizmic 14:40, 28 October 2006 (UTC)
In places where fresh water is scarce, one approach is to bathe or wash clothes or dishes in salt water, but then rinse in fresh water, to eliminate the salt water residue. Food may also be cooked in salt water. Note that salt water from the sea has life forms and debris in it, too, which can clog pipes. Filtering the water helps, but the filters will soon clog, as well. One approach is to clean the pipes using a "pig", a large slug rammed down the pipe to scrape the sides clean, on a regular basis. StuRat 15:26, 28 October 2006 (UTC)
Hello,
Could somebody please help me with the name of a picture viewing machine, widely prevalent in India in the 1960s and 70s (maybe earlier and in other places too) where a record used to be played on a grammophone and kids looked through peepholes, 5 or 6 of them around a cylindrical (or polygonal) base. inside were pictures pasted on a coaxial polygon which rotated as the operator turned a crank. the whole thing rested on a table or tripod and could be packed and carried on the head.
will a picture along with the name be too much to ask for?
i have tried bioscopes but the images i'm getting on the net are not the ones i mean.
thanks in advance for the trouble.
regards
Kushal, Chennai, India
thanks for taking the trouble, though i'm afraid i'm still searching. am adding a few more clarifications that might help. > it was always (at least all i've seen) topped with a victrola - so its more of a fairground kinda machine than a serious photo viewing device. > it was larigish, lets say about a 3/4m across. > the pics seen were definitely still iamges(and meant to be so) > the peepholes had lenses on them and were covered with a lid on the outside when not in use> and finally its the theme in the latest compaq ad by shah rukh khan as being shown on tv channels in india
sorry again for the trouble, but its driving me nuts!
I am doing an experiment where I am seeing what enzyme will tenderize meat the fastest. I need a concentration/percentage that is very close. For example, if the sample of papain contains 97% of papain as the main ingredient,then ficin should be very close to that amount.
I would appreciate if anyone would know where I could purchase these digestive enzymes:
Papain (Papaya), Bromelain (Pineapple), Ficin (Figs) and Actinidin (Kiwi). Preferrably in powder form, since it would be hard to know the amount of the enzyme in each piece of fruit.
The problem I am finding is that the Health Stores only carry Papain and Bromelain and some of the biochemical companies sell only industrial size.
Would any universities carry them?
Thanks,
JDC
Hello, I was reading the Wikipedia article on the neutrino and noticed the mention that it might be the same particle as the antineutrino. There wasn't a very good explanation as to why this would be so that I could find, so I was wondering if someone could give an explanation. Thanks! Andromeda321 16:00, 28 October 2006 (UTC)
Hi there
is there a simple and clear way of understanding dependent variables and independent variables? I am 49 years of age, studying for a Single Hons Degree in Psychology, but Research Methods defeats me - especially understanding what these variables are and how to use them. Have had discussions with fellow students and a one to one session with a student taking his Phd. Am tearing my hair out, given so many examples but do not understand any of them. Please somebody help this thick old woman!!!!!!!!! Carole D
even though i could get lot of information about control system but the subjects which are in continution to it like Discrete Control System,Optimal control system, Adaptive Control System,Computer Adied Designe Of Control System , i am unable to get information about these subjects. can you suggest me how to get the notes of these subjects.
202.63.109.234 16:52, 28 October 2006 (UTC)imran (A.C.E.T)
respected sir, im an engineering student and i would like to know how to create an artificial force field. for many good reasons keeping in view the defence system of every country.by using artificial force fieldis it possible to convert the energy grabbed by the object to the potential energy of the system and can be re imparted energy to thre object.its a very typical question.so i would be needing ur help to get out of this problem.hope to seek the answer soon. —The preceding unsigned comment was added by Punitmalpani007 ( talk • contribs) .
I'm thinking about making yeast bread, but I like to buy my food by price-per-unit-weight. How much mass does yeast consume in producing carbon dioxide, assuming the standard practice of letting the dough double in volume? What would be the most cost-effective way to do this? Black Carrot 18:52, 28 October 2006 (UTC)
I have often heard that soy is the only vegetable source of complete protein; however, I have also heard this claim made for certain grains such as buckwheat, quinoa, and amaranth. I found a ref for quinoa, but am having trouble for the others. Does anybody know of any reliable sources that can tell me once and for all which, if any, vegetable proteins are complete? -- Ginkgo100 talk · e@ 20:58, 28 October 2006 (UTC)
For clarification, may we assume in a dietary context a "complete protein" is one which contains all essential amino acids? alteripse 14:40, 29 October 2006 (UTC)
How many valence electrons does oxygen have? 71.97.11.77 21:25, 28 October 2006 (UTC)nicholassayshi
Six. Why do you ask? Theresa Knott | Taste the Korn 21:51, 28 October 2006 (UTC)
It doesn't say in the web site. 71.97.11.77 22:08, 28 October 2006 (UTC)nicholassayshi
Who can explain to me why, when you look along a tarmac or asphalt road on a hot day, you see a shimmering, mirrored effect in the distance. I presume its heat related and is the same effect that produces shimmering in the desert, but what is the exact mechanism? Thanks. Rockpocke t 21:26, 28 October 2006 (UTC)