So why not raise the speed limit and ticket people who tailgate? Its better from a saftey perspective and keeps their precious revenue following in. IIRC this is what Germany does on its highways and it seems to work fine.
The reason that dimples work for a golf ball is exactly the same reason they would be counter productive for the wind tunnel. Basically the dimples induce a turbulent flow around the golf ball, which reduces the flow seperation at the rear of the ball as compared to that resulting from laminar flow over a smooth ball. By reducing the size of the flow separation region, the pressure drag on the ball is significantly reduced, allowing the ball to travel farther. Now in the case of the wind tunnel turbulent flow along the walls would generate noise that would interfere with the experiments, so they want as smooth a surface as possible to minimize turbulence at the tunnel walls, thereby minimizing the background noise.
>Agreed! In fact, I'd say that giving money is the worst option. When you give time, you help directly, with nothing skimmed off the top.
While giving money certainly isn't the only option or the best option necessarily, that doesn't make it the worst option. Many charities require a combination of material donations, such as money, as well as donations of time through volunteering to be sucessful. Consider something like a soup kitchen. Its true that if it only gets material donations, it won't be effective without volunteers to prepare and distribute them. However, it won't be effective either if it only has volunteers without any food to distribute. The point of charity is to give what you can to help those in need. A person lacking free time that gives money is not exercising a worse option than someone else lacking money that gives their time, and neither is the reverse true. To try and form a pecking order out of the different types of charitable giving is to lose sight of the bigger picture.
You are correct for the most part, but you are ignoring one important factor. The amount of powder used is scaled for the size, or mass, of the bullet so it reaches the desired muzzle velocity (which should be on the upper end of what drag makes practical). The heavier bullet will have more energy (and momentum) and therefore be more effective for armor penetration. Its a similiar to the reason uranium (twice the density of lead) is used in anti-tank rounds. Your target velocity can always be achieved by tossing enough explosive behind your round (or bullet) so the real driving factor is density, the heavier it is, the more effective it will be.
>Until Windows 95 came out (and 3.11 to a lesser extent)... NO ONE HAD PC's AT HOME.
>The home market was dominated by Commodore, Apple, Atari, Tandy, TI, etc.
By that standard... NO HAS APPLE'S AT HOME NOW... after all the home market is dominated by PC clones so we can pretent that nothing else exists... right?
and if you had basic understanding of how a dictionary works, you would understand that those 3 "points" are alternate accepted definitions. Hence you are admiting that USSR meets the first two definitions, as most people would agree. Also, you do realize that socialism existed before Marx, and hence must have a primary definiation independant of Marx's theories. Hence whether the USSR fuldilled is irrelevant to the question. I'd also further point out that require strict adherence to the principle of distribution following "from each and everyone after ability, to each and everyone after need", means that your examples of socialists would not truly be socialists either, since last time i check they don't exactly follow that either. I'm afraid the only person here holding onto preconceived ideas would be yourself.
I never said that socialism was good or bad in itself, or that the USSR practiced the perfect socialist ideal, I was simply stating the fact that the USSR was a socialist country. You don't have to agree with or fulfil all the rationales of a system to employ it.
Yes Wiki is not an authoritative source on anything, thats why i got my definition from elsewhere, that one was from dictionary.com. If you pefer, here is Webster's definition:
Main Entry: socialism
Pronunciation: 'sO-sh&-"li-z&m
Function: noun
1 : any of various economic and political theories advocating collective or governmental ownership and administration of the means of production and distribution of goods
2 a : a system of society or group living in which there is no private property b : a system or condition of society in which the means of production are owned and controlled by the state
3 : a stage of society in Marxist theory transitional between capitalism and communism and distinguished by unequal distribution of goods and pay according to work done
It seems you want to redefine socialism to exclusively mean the social democrats of Europe, but that "socialism" in europe is by definiation just a transition phase from capitalism to socialsm that shows traits of both systems in its current state.
Anyway, the Setterfield study you mention only used a portion of the points to obtain the decay trend for speed of light, while a best fit of the entire data set shows a slight increase in speed, with constant speed being well within the margin of error. Basically Setterfield picked the data points that would give him the results he wanted, which wouldn't be too hard if you consider that early measurements were less accurate than modern measurements, thus it is obvious that if you only select data points for the larger measurements over time, the speed of light will appear to be slowing down because the margin of error is decreasing. Of course you could do the same thing with the lower measurements and have it appear that the speed of light is increasing.
1) If a public website constitutes controlled information, then by you logic your web browser is constantly violating copyrights by producing copies for your viewing.
- and -
2) Who gave you premission to copy my post anyway? Someone get me a lawyer!
Since when does providing an archive of freely available material equate to wholesale distribution without regard to copyrights? Its a clear example of fair use, if it wasn't public libraries would have been outlawed long ago for providing such services...
1.00 What is slashdot? (Huh?) 0.83 Is Slashdot actually a website?
0.77 Does slashdot postings cause extra traffic for its mentioned websites?
0.76 Is Slashdot a web site? (this one seems to vary a bit) 0.39 Is slashdot.org good?
0.35 Is the website at slashdot.org full of trolls and mindless linux bigots?
0.30 Was mindpixel slashdotted?
0.13 Is Slashdot the greatest site ever?
0.05 Has the average person (e.g. your Mother) ever heard of Slashdot?
and finally 0.00 is slashdot good journalism? (How sad)
Of course this is just a sampling of all the related mindpixel questions, but we can conclude that slashdot is a popular topic for mindpixel, but nobody mistakes it for good journalism...
Eating meat is natural for people, and a number of other animals as well. There is nothing barbaric about eating the foods that your body is meant to. Now if you were saying the modern treatment of livestock is often barbaric, I'd be inclined to agree, but these are two different matters entirely.
I know that eating fake meat will be better for the world, but people won't bite (Pun Intended) if it doesn't taste comperable to real meat.
It might be, but then again it might be worse. What makes you so sure that fake meat will be better for the world? As this is a very recent breakthrough, there really isn't any evidence yet for making such a claim.
Why don't they just *start the bidding* at their reserve price?
If you draw more people in to start bidding at a low price its more likely that you will generate more interest and start a bidding war which results in a higger selling price than if you just started asking for more. Its actually a common practice in real auctions to start at an artificially low price as well...
I don't think that comparing the affect on books and games would be that useful in this case. Books are typically something that you will probably just read once then be done with, even if it is a fairly good book, while games it is common to replay over a more extended period, especially if it is good. I'm not saying this is the case all of the time but in general its true. Thus whatever impact it has on the volume of book sales, I would expect a smaller effect on the volume of game sales. Though it might result in better games getting mor of those sales.
Two bladed helicopters are a special case in which the blades are typically parallel with flapping allowed by tettering the blades about a central pivot. For helicopters with more blades, the connection of the blades the the rotor hub are hinged to allow three types of movement, which are: up/down flapping, lead/lag, and blade feathering (i.e. pitch adjustment). These hinges are typical mechanical, but can also be "virtual" hinges where the material is designed to allow the required motions. Either way this allows for the for the thrust vector to be more easily adjusted and protects the rotor hub from the large moments resulting from the lift generated by the blades. Typically the flapping motion is limited to angular varition of a few degrees and lead/lag motion is around an order of magnitude smaller. The feathering motion is the only type controled through the swash plate which provides both collective and cyclic adjustment to pitch through a linkage which causes rotation about the feathering bearing.
As a fellow MechE who has done some work with helicopter flight modeling, there are just a few points i'd like to add:
The cone shape is a result of the force balance of the lift produced by the blade and the centrifugal acceleration.
The blade "flapping" is not controlled directly by the pilot, but is instead an induced responce to the varition of the lift distribution over the blade as it rotates which is controled by varying the collective and cyclic pitch.
on most rotors, there is a root cut out corresponding to 20%-25% of the rotor radius (i.e. no lifting surface in this region), which avoids the issue of reverse airflow. Additionally, helicopter blades are twisted, usually at a unifor twist rate so that blade pitch is higher closer to the rotor, which increases lift in the areas of slower air flow to the center of the rotor. This linear twist rate is a reasonable approximation of the ideal twist rate that would result in uniform lift over the rotor disk during hover. (On a side note, another reason for the root cut out is that the ideal twist rate tends towards infinity near the center of the rotor.) Additionally, having lifting surfaces over most of the blade reduces the cyclic correction needed to balance the lift distribution due to the different speeds of the blades relative to the air stream on each side of the rotor. Finally, there is the phenomina of tip-loss that effectively eliminates the lift generated from the outer 2-3% of the blades.
I never understood why they don't make a hybrid plane/helicopter with wings, a jet engine, and rotor blades. I'm not sure how easy it would be, but the design would be much better than something like a harrier, which is probably one of the worst designs as far as veritcal liftoff goes.
While this sounds like a nice idea a first its suffers from the fact that it is quite impractical. For example, at the high speeds at which jets typically operate the rotor blades would significantly increase the drag over the stream lined jet body, if not making the handling characteristics altogether unstable. Also the wings will interfere with the rotor downwash, reducing lift and making the flight more unstable. Of course there is also the issue of increase weight of the dual system further increaseing the power and fuel requirements of the craft. This is why VTOL planes stick with a single propulsion system, such as a jet with thrust vectoring or mini-rotors that can be rotated and function as propellers.
The lift is balanced using a combination of collective and cyclic control of the blade pitch through the use of a swashplate. Collective control is acheived by raising and lowering the swashplate to uniformly vary blade pitch. The swashplate can also be tilited to vary the pitch with respect the the azimuthal position of the blade. This cyclic control is usually split into two components: the lateral and longitudinal cyclic pitchs. Varying the cyclic controls is also provide directional control and forward propulsion for the standard helicopter by reorienting the lift vector.
They just don't get it. The winners are the consumer who gets to pay lower prices for the products and services. The other winners are the stockholders of the corporation who get higher dividends and portfolio value.
You're forgetting the biggest loser, the taxpayers (i.e. everyone with the money to buy those services) who must now foot the bill for addition unemployment benefits and government assistance program, while also making up for the reduced tax base. Its very short sighted to say that a temporary reduction in prices,which often don't reach consumers anyway, save money while ignoring the other cost which are more long term.
Slashdot Mirror
So why not raise the speed limit and ticket people who tailgate? Its better from a saftey perspective and keeps their precious revenue following in. IIRC this is what Germany does on its highways and it seems to work fine.
The reason that dimples work for a golf ball is exactly the same reason they would be counter productive for the wind tunnel. Basically the dimples induce a turbulent flow around the golf ball, which reduces the flow seperation at the rear of the ball as compared to that resulting from laminar flow over a smooth ball. By reducing the size of the flow separation region, the pressure drag on the ball is significantly reduced, allowing the ball to travel farther. Now in the case of the wind tunnel turbulent flow along the walls would generate noise that would interfere with the experiments, so they want as smooth a surface as possible to minimize turbulence at the tunnel walls, thereby minimizing the background noise.
>Agreed! In fact, I'd say that giving money is the worst option. When you give time, you help directly, with nothing skimmed off the top.
While giving money certainly isn't the only option or the best option necessarily, that doesn't make it the worst option. Many charities require a combination of material donations, such as money, as well as donations of time through volunteering to be sucessful. Consider something like a soup kitchen. Its true that if it only gets material donations, it won't be effective without volunteers to prepare and distribute them. However, it won't be effective either if it only has volunteers without any food to distribute. The point of charity is to give what you can to help those in need. A person lacking free time that gives money is not exercising a worse option than someone else lacking money that gives their time, and neither is the reverse true. To try and form a pecking order out of the different types of charitable giving is to lose sight of the bigger picture.
You are correct for the most part, but you are ignoring one important factor. The amount of powder used is scaled for the size, or mass, of the bullet so it reaches the desired muzzle velocity (which should be on the upper end of what drag makes practical). The heavier bullet will have more energy (and momentum) and therefore be more effective for armor penetration. Its a similiar to the reason uranium (twice the density of lead) is used in anti-tank rounds. Your target velocity can always be achieved by tossing enough explosive behind your round (or bullet) so the real driving factor is density, the heavier it is, the more effective it will be.
>Until Windows 95 came out (and 3.11 to a lesser extent)... NO ONE HAD PC's AT HOME.
>The home market was dominated by Commodore, Apple, Atari, Tandy, TI, etc.
By that standard... NO HAS APPLE'S AT HOME NOW... after all the home market is dominated by PC clones so we can pretent that nothing else exists... right?
and if you had basic understanding of how a dictionary works, you would understand that those 3 "points" are alternate accepted definitions. Hence you are admiting that USSR meets the first two definitions, as most people would agree. Also, you do realize that socialism existed before Marx, and hence must have a primary definiation independant of Marx's theories. Hence whether the USSR fuldilled is irrelevant to the question. I'd also further point out that require strict adherence to the principle of distribution following "from each and everyone after ability, to each and everyone after need", means that your examples of socialists would not truly be socialists either, since last time i check they don't exactly follow that either. I'm afraid the only person here holding onto preconceived ideas would be yourself.
I never said that socialism was good or bad in itself, or that the USSR practiced the perfect socialist ideal, I was simply stating the fact that the USSR was a socialist country. You don't have to agree with or fulfil all the rationales of a system to employ it.
Yes Wiki is not an authoritative source on anything, thats why i got my definition from elsewhere, that one was from dictionary.com. If you pefer, here is Webster's definition:
Main Entry: socialism
Pronunciation: 'sO-sh&-"li-z&m
Function: noun
1 : any of various economic and political theories advocating collective or governmental ownership and administration of the means of production and distribution of goods
2 a : a system of society or group living in which there is no private property b : a system or condition of society in which the means of production are owned and controlled by the state
3 : a stage of society in Marxist theory transitional between capitalism and communism and distinguished by unequal distribution of goods and pay according to work done
It seems you want to redefine socialism to exclusively mean the social democrats of Europe, but that "socialism" in europe is by definiation just a transition phase from capitalism to socialsm that shows traits of both systems in its current state.
umm... you need to check the definition of socialism and compare it to this idealist view you seem to have about it. FYI socialism is:
socialism
n 1: a political theory advocating state ownership of industry 2: an economic system based on state ownership of capital
By the definiation of socialism, the USSR was very socialist...
Union of Soviet Socialist Republics
yup, no sign of socialism there...
way to plagiarize!I CLE_ID=39733
http://www.worldnetdaily.com/news/article.asp?ART
Anyway, the Setterfield study you mention only used a portion of the points to obtain the decay trend for speed of light, while a best fit of the entire data set shows a slight increase in speed, with constant speed being well within the margin of error. Basically Setterfield picked the data points that would give him the results he wanted, which wouldn't be too hard if you consider that early measurements were less accurate than modern measurements, thus it is obvious that if you only select data points for the larger measurements over time, the speed of light will appear to be slowing down because the margin of error is decreasing. Of course you could do the same thing with the lower measurements and have it appear that the speed of light is increasing.
There are some more responses to the slowing speed of light myth here:
http://www.talkorigins.org/indexcc/CE/CE411.html
And here is an article about a recent NASA study that shows the speed of light is constant:
http://www.msnbc.msn.com/id/3741682/
Stop and think for a minute, which is the only one of those places where people actually watch Cricket, or even know what it is for that matter...
Well two issues here:
1) If a public website constitutes controlled information, then by you logic your web browser is constantly violating copyrights by producing copies for your viewing.
- and -
2) Who gave you premission to copy my post anyway? Someone get me a lawyer!
Since when does providing an archive of freely available material equate to wholesale distribution without regard to copyrights? Its a clear example of fair use, if it wasn't public libraries would have been outlawed long ago for providing such services...
... after a quick investigation:
1.00 What is slashdot? (Huh?)0.83 Is Slashdot actually a website?
0.77 Does slashdot postings cause extra traffic for its mentioned websites?
0.76 Is Slashdot a web site? (this one seems to vary a bit)
0.39 Is slashdot.org good?
0.35 Is the website at slashdot.org full of trolls and mindless linux bigots?
0.30 Was mindpixel slashdotted?
0.13 Is Slashdot the greatest site ever?
0.05 Has the average person (e.g. your Mother) ever heard of Slashdot?
and finally
0.00 is slashdot good journalism? (How sad)
Of course this is just a sampling of all the related mindpixel questions, but we can conclude that slashdot is a popular topic for mindpixel, but nobody mistakes it for good journalism...
Honestly people, it's barbaric to eat animals.
Eating meat is natural for people, and a number of other animals as well. There is nothing barbaric about eating the foods that your body is meant to. Now if you were saying the modern treatment of livestock is often barbaric, I'd be inclined to agree, but these are two different matters entirely.
I know that eating fake meat will be better for the world, but people won't bite (Pun Intended) if it doesn't taste comperable to real meat.
It might be, but then again it might be worse. What makes you so sure that fake meat will be better for the world? As this is a very recent breakthrough, there really isn't any evidence yet for making such a claim.
Why don't they just *start the bidding* at their reserve price?
If you draw more people in to start bidding at a low price its more likely that you will generate more interest and start a bidding war which results in a higger selling price than if you just started asking for more. Its actually a common practice in real auctions to start at an artificially low price as well...
I don't think that comparing the affect on books and games would be that useful in this case. Books are typically something that you will probably just read once then be done with, even if it is a fairly good book, while games it is common to replay over a more extended period, especially if it is good. I'm not saying this is the case all of the time but in general its true. Thus whatever impact it has on the volume of book sales, I would expect a smaller effect on the volume of game sales. Though it might result in better games getting mor of those sales.
Two bladed helicopters are a special case in which the blades are typically parallel with flapping allowed by tettering the blades about a central pivot. For helicopters with more blades, the connection of the blades the the rotor hub are hinged to allow three types of movement, which are: up/down flapping, lead/lag, and blade feathering (i.e. pitch adjustment). These hinges are typical mechanical, but can also be "virtual" hinges where the material is designed to allow the required motions. Either way this allows for the for the thrust vector to be more easily adjusted and protects the rotor hub from the large moments resulting from the lift generated by the blades. Typically the flapping motion is limited to angular varition of a few degrees and lead/lag motion is around an order of magnitude smaller. The feathering motion is the only type controled through the swash plate which provides both collective and cyclic adjustment to pitch through a linkage which causes rotation about the feathering bearing.
As a fellow MechE who has done some work with helicopter flight modeling, there are just a few points i'd like to add:
The cone shape is a result of the force balance of the lift produced by the blade and the centrifugal acceleration.
The blade "flapping" is not controlled directly by the pilot, but is instead an induced responce to the varition of the lift distribution over the blade as it rotates which is controled by varying the collective and cyclic pitch.
on most rotors, there is a root cut out corresponding to 20%-25% of the rotor radius (i.e. no lifting surface in this region), which avoids the issue of reverse airflow. Additionally, helicopter blades are twisted, usually at a unifor twist rate so that blade pitch is higher closer to the rotor, which increases lift in the areas of slower air flow to the center of the rotor. This linear twist rate is a reasonable approximation of the ideal twist rate that would result in uniform lift over the rotor disk during hover. (On a side note, another reason for the root cut out is that the ideal twist rate tends towards infinity near the center of the rotor.) Additionally, having lifting surfaces over most of the blade reduces the cyclic correction needed to balance the lift distribution due to the different speeds of the blades relative to the air stream on each side of the rotor. Finally, there is the phenomina of tip-loss that effectively eliminates the lift generated from the outer 2-3% of the blades.
I never understood why they don't make a hybrid plane/helicopter with wings, a jet engine, and rotor blades. I'm not sure how easy it would be, but the design would be much better than something like a harrier, which is probably one of the worst designs as far as veritcal liftoff goes.
While this sounds like a nice idea a first its suffers from the fact that it is quite impractical. For example, at the high speeds at which jets typically operate the rotor blades would significantly increase the drag over the stream lined jet body, if not making the handling characteristics altogether unstable. Also the wings will interfere with the rotor downwash, reducing lift and making the flight more unstable. Of course there is also the issue of increase weight of the dual system further increaseing the power and fuel requirements of the craft. This is why VTOL planes stick with a single propulsion system, such as a jet with thrust vectoring or mini-rotors that can be rotated and function as propellers.
The lift is balanced using a combination of collective and cyclic control of the blade pitch through the use of a swashplate. Collective control is acheived by raising and lowering the swashplate to uniformly vary blade pitch. The swashplate can also be tilited to vary the pitch with respect the the azimuthal position of the blade. This cyclic control is usually split into two components: the lateral and longitudinal cyclic pitchs. Varying the cyclic controls is also provide directional control and forward propulsion for the standard helicopter by reorienting the lift vector.
They just don't get it. The winners are the consumer who gets to pay lower prices for the products and services. The other winners are the stockholders of the corporation who get higher dividends and portfolio value.
You're forgetting the biggest loser, the taxpayers (i.e. everyone with the money to buy those services) who must now foot the bill for addition unemployment benefits and government assistance program, while also making up for the reduced tax base. Its very short sighted to say that a temporary reduction in prices,which often don't reach consumers anyway, save money while ignoring the other cost which are more long term.