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Our Rosette (botany) article sucks. Can someone (a) fix the wording (especially the confused second sentence), and (b) suggest some other common examples? (I'll be glad to try to take some more pictures. At the very least I'll have to try to take a better picture of a dandelion.) — Steve Summit ( talk) 00:33, 24 April 2008 (UTC)
I am trying to ascertain the size and magnitude of damage a 'Orbital Weapons Platform', falling from orbit, would cause in terms of craters, etc. Given the object has roughly the mass of a big avg. city bus, possibly 50-100% denser, whatever is feasible, it's a hypothetical modern-era object that fell from orbit, I'm sure there is some natural curve for velocity here, it obviously couldn't be moving the speed of a comet or some-such. How high would the impact crater walls be? Is it feasible it has rutted up a trench in it's wake, on say a moderately shallow trajectory? Would any of it actually survive? It's a tough military-grade object. —Preceding unsigned comment added by 68.221.126.35 ( talk) 00:38, 24 April 2008 (UTC)
Not sure how to respond in this area. That helped some, I just don't have the math background to really comprehend the outcome. Some advice in that regard would help greatly. —Preceding unsigned comment added by IamSamoth ( talk • contribs) 02:28, 24 April 2008 (UTC)
You might enjoy our Kinetic bombardment article (which includes the concept of "Rods from God").
Atlant ( talk) 12:48, 24 April 2008 (UTC)
Wow! Thanks all! Great info, awesome calulator! :) TYVM! —Preceding unsigned comment added by IamSamoth ( talk • contribs) 13:25, 26 April 2008 (UTC)
Any eggheads here with a JSTOR subscription? Help is needed here. Franamax ( talk) 00:54, 24 April 2008 (UTC)
Who coined the term "evolution" (I suspect it was either Lamarck or Darwin, but I'm not sure)? BeefJeaunt ( talk) 01:32, 24 April 2008 (UTC)
What is the cost of nitrogen in it's gas state? —Preceding unsigned comment added by 76.14.124.175 ( talk) 04:45, 24 April 2008 (UTC)
I'm wonder what species this gecko I found in my mailbox is.
Also there's a bunch of spiders I've taken photos of with poor or minimal IDs. Anyone want to have a go at giving an ID? This Spiders of Australia site is quite good, but I've given up. ( link) — Pengo 05:04, 24 April 2008 (UTC)
Does anyone know what the proper term is for the effect where subjects try and anticipate the results the experimenter is trying to achieve, and respond accordingly? There's a specific term I'm thinking of, but I can't quite remember it. All suggestions welcome... thanks -- 131.111.135.84 ( talk) 06:10, 24 April 2008 (UTC)
I live on the 20th floor of an apartment complex in the centre of Sydney and feed various birds from my balcony, including lorikeets and pigeons (even though the feeding of pigeons is frowned upon). The lorikeets are very beautiful, feisty, and demanding, but are picky eaters. Nevertheless, I feed as many as I can to encourage them to live in the city. The pigeons will eat any old bread or seed, but they are numerous, and I only feed “special” ones which have particularly striking plumage, or are especially friendly. Every day, I see a large flock of these pigeons—many of them my own visitors—hanging about the park outside the complex, and being fed by residents and passers-by. I am no pigeon fancier, but I have noticed that our local flock seem to have a much wider variety of plumages on show than flocks in other areas. Hardly two birds look alike, and several have stunning red and white necks that made me think at first that they must be products of some interspecies mating. This is very different to other flocks I have seen in which the great bulk of their constituents could be clones.
Typically, in many other areas, people indiscriminately throw breadcrumbs at a seething mass of birds in a park, but in my local situation, residents can only feed a few birds at a time from their small balconies, and inevitably favour the prettier and more affectionate ones. I got the idea that perhaps the feeding patterns of the area had contributed to this variability. As this pattern of feeding has been going on for at least 40 years, I am wondering if there has been a form of selection pressure that has led to larger than normal variability in plumage patterns and colourings, and whether anything like this occurs in other pigeon groupings in comparable circumstances. Myles325a ( talk) 07:47, 24 April 2008 (UTC)
I live about 5 miles from a major airport. I've sometimes heard an echoing sort of aircraft noise that drops very rapidly in pitch from very high to very low in just three or four seconds, from silence into silence. I'm sure it's nothing to do with the Doppler effect as it happens so quickly and the sound is not overhead. I have come up with a theory based on the fact that (1) I live on a hillside (2) now that I come to think about it, I associate the sound with overcast weather conditions. Could it be that a sound wave is oscillating between the ground and the cloud base, and because this distance rapidly becomes greater as the aircraft moves "downhill", the frequency suddenly drops? Is the cloud base substantial enough to reflect this sound wave?-- Shantavira| feed me 08:26, 24 April 2008 (UTC)
What is the procedure of annealing Copper CuSn6? Including at what temparature to heat how long and what temparature to cool and through what period of time? —Preceding unsigned comment added by 122.166.11.179 ( talk) 11:01, 24 April 2008 (UTC)
The game of tennis can be played on different surfaces. The news often mentions that a grass surface is "faster" than a clay surface. What is meant by "faster" in this context? Astronaut ( talk) 11:59, 24 April 2008 (UTC)
Also, any court is subject to "speed" changes due to weather. Clay courts become faster when dry, grass courts slow down when dry. Hard courts are just a pain to play on when wet.
Hope I helped. —Preceding unsigned comment added by EWHS ( talk • contribs) 16:26, 26 April 2008 (UTC)
the force of interaction in polar solid is that of a dipole-dipole interaction which is strong and thus they have a high melting point.yet they are in the form of gases or liquids in room temperature?why? —Preceding unsigned comment added by Arya237 ( talk • contribs) 16:22, 24 April 2008 (UTC)
Common salt and Sugar are soluble in water while Sulphur is not.Why Sulphur is insoluble in water?Explain. —Preceding unsigned comment added by Geniuskrishna ( talk • contribs) 17:09, 24 April 2008 (UTC)
Can someone explain the symbols found on a heart monitor -- such as ECG, HR, PR, SpO2, Oxy CRG, ST, RESP, NIBP? -- 70.167.58.6 ( talk) 17:30, 24 April 2008 (UTC)
Here is what I know-
Hope this helps, Nimur ( talk) 17:51, 24 April 2008 (UTC)
If you want to learn how to interpret an ECG, I strongly suggest thumbing through an ALS or paramedicine guide from your local library, or poking around online. there are a few websites i've come across maintained by nurses and paramedics intended to provide ECG tutorials, including collections of many ECG strips to practice identifying arrhythmias. -- Shaggorama ( talk) 05:48, 29 April 2008 (UTC)
Does anyone know of a good list of fish species with edible roe? Is most roe edible? At the moment I'm trying to figure out the edibility of white bass roe, with no luck so far. I've also failed to find similar information on other species. Thanks - Qatter ( talk) 19:05, 24 April 2008 (UTC)
Is simply tasting the white bass roe something you'd be willing to try? If it looks at all appetizing, go for it. Vranak ( talk) 22:43, 24 April 2008 (UTC)
The article about ion thruster points out that the mechanism are only practical in outer space. However, can/have we fly/flied with an ion thruster on Earth? (even if commercially is senseless). 217.168.3.246 ( talk) 20:12, 24 April 2008 (UTC)
Greetings, reference desk.
This afternoon, while nattering with a college friend over the finer details of next weeks presentation, I noticed something strange in my pint of cider. My friend and I decided to call it Bertie, and I'm hoping you can tell me what Bertie was... here are the specifics:
My friend and I theorized that either Bertie was some sort of organism that respired cider, or some speck of something or other that reacted with the cider to produce oxygen, CO2 or something like that.
So... who or what is Bertie?! A pint to whomever tells me!
Regards, SGGH speak! 22:42, 24 April 2008 (UTC)
Cider is apple juice at a waypoint on the road to becoming Vinegar. In a program on semantics in the 1960's Mr. Wizard noted that one could sometimes find Mother in a bottle of vinegar, so perhaps Bertie is a very young Mother. See, for instance [7], where Mother/Bertie (formal name acetobacter) is said to be present in some cider vinegar. Was your cider a bit sour? [8] confirms the presence of acetobacter in cider. Edison ( talk) 01:34, 26 April 2008 (UTC)
Science desk | ||
---|---|---|
< April 23 | << Mar | April | May >> | April 25 > |
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. |
Our Rosette (botany) article sucks. Can someone (a) fix the wording (especially the confused second sentence), and (b) suggest some other common examples? (I'll be glad to try to take some more pictures. At the very least I'll have to try to take a better picture of a dandelion.) — Steve Summit ( talk) 00:33, 24 April 2008 (UTC)
I am trying to ascertain the size and magnitude of damage a 'Orbital Weapons Platform', falling from orbit, would cause in terms of craters, etc. Given the object has roughly the mass of a big avg. city bus, possibly 50-100% denser, whatever is feasible, it's a hypothetical modern-era object that fell from orbit, I'm sure there is some natural curve for velocity here, it obviously couldn't be moving the speed of a comet or some-such. How high would the impact crater walls be? Is it feasible it has rutted up a trench in it's wake, on say a moderately shallow trajectory? Would any of it actually survive? It's a tough military-grade object. —Preceding unsigned comment added by 68.221.126.35 ( talk) 00:38, 24 April 2008 (UTC)
Not sure how to respond in this area. That helped some, I just don't have the math background to really comprehend the outcome. Some advice in that regard would help greatly. —Preceding unsigned comment added by IamSamoth ( talk • contribs) 02:28, 24 April 2008 (UTC)
You might enjoy our Kinetic bombardment article (which includes the concept of "Rods from God").
Atlant ( talk) 12:48, 24 April 2008 (UTC)
Wow! Thanks all! Great info, awesome calulator! :) TYVM! —Preceding unsigned comment added by IamSamoth ( talk • contribs) 13:25, 26 April 2008 (UTC)
Any eggheads here with a JSTOR subscription? Help is needed here. Franamax ( talk) 00:54, 24 April 2008 (UTC)
Who coined the term "evolution" (I suspect it was either Lamarck or Darwin, but I'm not sure)? BeefJeaunt ( talk) 01:32, 24 April 2008 (UTC)
What is the cost of nitrogen in it's gas state? —Preceding unsigned comment added by 76.14.124.175 ( talk) 04:45, 24 April 2008 (UTC)
I'm wonder what species this gecko I found in my mailbox is.
Also there's a bunch of spiders I've taken photos of with poor or minimal IDs. Anyone want to have a go at giving an ID? This Spiders of Australia site is quite good, but I've given up. ( link) — Pengo 05:04, 24 April 2008 (UTC)
Does anyone know what the proper term is for the effect where subjects try and anticipate the results the experimenter is trying to achieve, and respond accordingly? There's a specific term I'm thinking of, but I can't quite remember it. All suggestions welcome... thanks -- 131.111.135.84 ( talk) 06:10, 24 April 2008 (UTC)
I live on the 20th floor of an apartment complex in the centre of Sydney and feed various birds from my balcony, including lorikeets and pigeons (even though the feeding of pigeons is frowned upon). The lorikeets are very beautiful, feisty, and demanding, but are picky eaters. Nevertheless, I feed as many as I can to encourage them to live in the city. The pigeons will eat any old bread or seed, but they are numerous, and I only feed “special” ones which have particularly striking plumage, or are especially friendly. Every day, I see a large flock of these pigeons—many of them my own visitors—hanging about the park outside the complex, and being fed by residents and passers-by. I am no pigeon fancier, but I have noticed that our local flock seem to have a much wider variety of plumages on show than flocks in other areas. Hardly two birds look alike, and several have stunning red and white necks that made me think at first that they must be products of some interspecies mating. This is very different to other flocks I have seen in which the great bulk of their constituents could be clones.
Typically, in many other areas, people indiscriminately throw breadcrumbs at a seething mass of birds in a park, but in my local situation, residents can only feed a few birds at a time from their small balconies, and inevitably favour the prettier and more affectionate ones. I got the idea that perhaps the feeding patterns of the area had contributed to this variability. As this pattern of feeding has been going on for at least 40 years, I am wondering if there has been a form of selection pressure that has led to larger than normal variability in plumage patterns and colourings, and whether anything like this occurs in other pigeon groupings in comparable circumstances. Myles325a ( talk) 07:47, 24 April 2008 (UTC)
I live about 5 miles from a major airport. I've sometimes heard an echoing sort of aircraft noise that drops very rapidly in pitch from very high to very low in just three or four seconds, from silence into silence. I'm sure it's nothing to do with the Doppler effect as it happens so quickly and the sound is not overhead. I have come up with a theory based on the fact that (1) I live on a hillside (2) now that I come to think about it, I associate the sound with overcast weather conditions. Could it be that a sound wave is oscillating between the ground and the cloud base, and because this distance rapidly becomes greater as the aircraft moves "downhill", the frequency suddenly drops? Is the cloud base substantial enough to reflect this sound wave?-- Shantavira| feed me 08:26, 24 April 2008 (UTC)
What is the procedure of annealing Copper CuSn6? Including at what temparature to heat how long and what temparature to cool and through what period of time? —Preceding unsigned comment added by 122.166.11.179 ( talk) 11:01, 24 April 2008 (UTC)
The game of tennis can be played on different surfaces. The news often mentions that a grass surface is "faster" than a clay surface. What is meant by "faster" in this context? Astronaut ( talk) 11:59, 24 April 2008 (UTC)
Also, any court is subject to "speed" changes due to weather. Clay courts become faster when dry, grass courts slow down when dry. Hard courts are just a pain to play on when wet.
Hope I helped. —Preceding unsigned comment added by EWHS ( talk • contribs) 16:26, 26 April 2008 (UTC)
the force of interaction in polar solid is that of a dipole-dipole interaction which is strong and thus they have a high melting point.yet they are in the form of gases or liquids in room temperature?why? —Preceding unsigned comment added by Arya237 ( talk • contribs) 16:22, 24 April 2008 (UTC)
Common salt and Sugar are soluble in water while Sulphur is not.Why Sulphur is insoluble in water?Explain. —Preceding unsigned comment added by Geniuskrishna ( talk • contribs) 17:09, 24 April 2008 (UTC)
Can someone explain the symbols found on a heart monitor -- such as ECG, HR, PR, SpO2, Oxy CRG, ST, RESP, NIBP? -- 70.167.58.6 ( talk) 17:30, 24 April 2008 (UTC)
Here is what I know-
Hope this helps, Nimur ( talk) 17:51, 24 April 2008 (UTC)
If you want to learn how to interpret an ECG, I strongly suggest thumbing through an ALS or paramedicine guide from your local library, or poking around online. there are a few websites i've come across maintained by nurses and paramedics intended to provide ECG tutorials, including collections of many ECG strips to practice identifying arrhythmias. -- Shaggorama ( talk) 05:48, 29 April 2008 (UTC)
Does anyone know of a good list of fish species with edible roe? Is most roe edible? At the moment I'm trying to figure out the edibility of white bass roe, with no luck so far. I've also failed to find similar information on other species. Thanks - Qatter ( talk) 19:05, 24 April 2008 (UTC)
Is simply tasting the white bass roe something you'd be willing to try? If it looks at all appetizing, go for it. Vranak ( talk) 22:43, 24 April 2008 (UTC)
The article about ion thruster points out that the mechanism are only practical in outer space. However, can/have we fly/flied with an ion thruster on Earth? (even if commercially is senseless). 217.168.3.246 ( talk) 20:12, 24 April 2008 (UTC)
Greetings, reference desk.
This afternoon, while nattering with a college friend over the finer details of next weeks presentation, I noticed something strange in my pint of cider. My friend and I decided to call it Bertie, and I'm hoping you can tell me what Bertie was... here are the specifics:
My friend and I theorized that either Bertie was some sort of organism that respired cider, or some speck of something or other that reacted with the cider to produce oxygen, CO2 or something like that.
So... who or what is Bertie?! A pint to whomever tells me!
Regards, SGGH speak! 22:42, 24 April 2008 (UTC)
Cider is apple juice at a waypoint on the road to becoming Vinegar. In a program on semantics in the 1960's Mr. Wizard noted that one could sometimes find Mother in a bottle of vinegar, so perhaps Bertie is a very young Mother. See, for instance [7], where Mother/Bertie (formal name acetobacter) is said to be present in some cider vinegar. Was your cider a bit sour? [8] confirms the presence of acetobacter in cider. Edison ( talk) 01:34, 26 April 2008 (UTC)