It's not just about the heat though. Because you're not burning the hydrogen you use as the propellant, the exhaust speed is higher because of the lower molecular weight. NERVA got an Isp of about 1200 before it was scrapped.
The propellant is hydrogen, otherwise it's not worth doing. The Isp goes up with the temperature of the exhaust, and down with increasing molecular mass. If you pump hydrogen through at close to melting point of your engine you can get an Isp of about 1200. (compared to shuttle main engine which gets just under 400)
Agreed on the mortar shell, I was just pointing out how good their tracking was. But no way is a fifty kW laser going to break apart a solid steel sphere unless they can magically focus it down to a mm square or so. Surface ablation at most, and then the energy budget gets worse. The laser will be firing through the cloud of plasma, at a brand new shiny metal surface. Some blocking and considerable reflection, and more energy to vaporise than just to melt. Thinking aout it, I'm guessing the "steel sphere" is hollow with a wall thickness of only a mm or two, and "destroying it" consists of melting to the point it breaks up.
Well, while we are calculating things, they don't say if it was a solid steel sphere, but if it was:
82 mm sphere = 288 cc of steel = 2.2kg of steel
heat capacity of steel ~ = 0.5kj/kg C
melting point of steel ~ = 1500 C
power input = 50kW
So, assuming it was solid, 50 kW would heat it approx 50 degrees per second maximum. Either they tracked it continuously and perfectly for at least 30 seconds, or it wasn't solid. Looks to me like their tracking system is at least as interesting as the laser
Except that the GMO lobby has successfully made it illegal to label non-GMO foods as GMO-free. Arguing that GMO foods should not have to be labelled as such is one thing, prohibiting the competition from correctly labelling theirs is indefensible.
In that case, why the resistance to allowing non-GMO food to be labelled as GMO-Free? Allowing that labelling incurs no cost on the GMO producers, or on any other producer who doesn't bother to add it.
Not quite.
You have told a website that you want to see it. It sends you the page. Part of that page is information that the website includes content from a third party. Your browser then goes and asks for the third party content.
If you don't want to see that content, then your browser shouldn't ask for it. It is quite easy not to, you simply add noscript and adblock. Or apparently, if you are french you can have your ISP block it for you.
It's not as simple as it used to be (unplugging a cable), but as soon as there is a useful reason to do it, how long do you think it will be before somone is selling the service? Winding back may be difficult, but in this case you will simply be not recording travel. Best result might be to just halve or quarter the sensor responses, then you can keep track for servicing etc, while still cutting your tax bill.
just charge per number of miles driven per car. report the odometer reading yearly. drive more, pay more. this will encourage both more fuel efficient cars and living closer to work.
No, this will encourage disconnecting the odometer.
That word doesn't mean what you think it means. Unless you mean the US was run up on a beach for the fouling to be removed from its hull. Perhaps you meant (or the Editor meant) career?
It is also used to mean tilt or lean while in motion.
Your definition does seem oddly appropriate though.
Free speech didn't kill people in Jonestown. In each case it was either suicide by cyanide, or murder by the men with guns who forced the unwilling to drink it.
Personally, if I'm going to be nailed to a cross I would want it to be so badly constructed it would fall apart. Anyway, isn't nailing to a cross an easter discussion? We should be talking about God nailing Mary.
Safer from people maybe, but homicide figures don't count the spiders, snakes, drop bears, crocodiles, and sharks. Also you have to eat vegemite or we kick you out again.
What we really need is to find a nice largish asteroid (200 - 600 metres) that is going to make a close approach in 10 to 20 years, then hit a few years later. It would divert a lot of resources from the war on X and into space development. Bonus points if the delta V to capture it is achievable.
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation
Note that it says person, not citizen. Your constitution clearly specifies when it applies to citizens only vs when it applies to everyone. If doing it to Americans is wrong, then so is doing it to non-Americans. Since there is no declaration of war, the possible exception is the "public danger" clause. If it applies, then it applies to everyone. It could easily be argued that blowing up a US citizen terrorist is less a violation of the constitution than blowing up some non-threatening goat herder on the other side of the world. If you really want to see disgusting behavior that should get your politicians charged with murder, look up the "double-tap" strategy.
Meanwhile we are using drone strikes on American citizens without even a facade of due process...
You know, this is the attitude that pisses off most of the rest of the world. You don't even consider that using drone strikes against people who are not US citizens might be wrong. It's all "Oh no, Obama blew up an American, how terrible". Never mind the Afghan, Iraqi, and Pakistani kids being blown to bits, they're brown and not American so they don't matter.
Yeah, they mostly filled it. But it got a lot harder to find, and is much more focussed on the in crowd at that site. The other thing is the enthusiasm of the amatuers is gone. It was a once off thing - people were introduced to the internet and it was this wonderful new landscape that was mostly empty, and they went looking for things to fill it. Yeah a lot of it was crap, but it was every type of crap in the world. Now, it's all targeted at higher rankings and google ad revenue. The internet has gone from a vast conversation to being ten million channels of TV. There is a post further down that talks about S/N ratio. He's right, the signal is mostly still there, but the noise is deafening.
You may laugh about the crappy eye-hurting design, but when we lost geocities and similar amateur websites we lost a lot of information that isn't on the web anywhere else. Manufactures and tech websites can give you the specs on things, but Joe Blow in his garage pulling apart a blender and posting the pics would (accidently sometimes) show how to open it without breaking the internal clips. There was a lot of information on damn near anything if you knew how to search for it. Now everything is a bland advertisement or a repost of the same list of data over and over. SEO just about finished it off.
Not targeted enough. The chance that you get two identical emails from different sources and notice something's amiss is way too high.
Not if they all know each other. At one place I used to work, people would forward emails all over the place, to both internal and external contacts. If something was really funny or very relevent to the work, the popular people would see multiple copies as everyone sent it to them. Funniest thing was that there was a poorly enforced policy about spamming, so nobody forwarded them to IT. If it was malware it usually got everybody before IT even knew about it.
It's pretty obvious that the heavier one is the evil Higgs. From this we can deduce that the mass of a subatomic goatee travelling almost at lightspeed is at least 3GeV.
Slashdot Mirror
It's not just about the heat though. Because you're not burning the hydrogen you use as the propellant, the exhaust speed is higher because of the lower molecular weight.
NERVA got an Isp of about 1200 before it was scrapped.
The propellant is hydrogen, otherwise it's not worth doing. The Isp goes up with the temperature of the exhaust, and down with increasing molecular mass.
If you pump hydrogen through at close to melting point of your engine you can get an Isp of about 1200. (compared to shuttle main engine which gets just under 400)
Agreed on the mortar shell, I was just pointing out how good their tracking was.
But no way is a fifty kW laser going to break apart a solid steel sphere unless they can magically focus it down to a mm square or so.
Surface ablation at most, and then the energy budget gets worse. The laser will be firing through the cloud of plasma, at a brand new shiny metal surface. Some blocking and considerable reflection, and more energy to vaporise than just to melt.
Thinking aout it, I'm guessing the "steel sphere" is hollow with a wall thickness of only a mm or two, and "destroying it" consists of melting to the point it breaks up.
Well, while we are calculating things, they don't say if it was a solid steel sphere, but if it was :
82 mm sphere = 288 cc of steel = 2.2kg of steel
heat capacity of steel ~ = 0.5kj/kg C
melting point of steel ~ = 1500 C
power input = 50kW
So, assuming it was solid, 50 kW would heat it approx 50 degrees per second maximum. Either they tracked it continuously and perfectly for at least 30 seconds, or it wasn't solid. Looks to me like their tracking system is at least as interesting as the laser
Except that the GMO lobby has successfully made it illegal to label non-GMO foods as GMO-free.
Arguing that GMO foods should not have to be labelled as such is one thing, prohibiting the competition from correctly labelling theirs is indefensible.
In that case, why the resistance to allowing non-GMO food to be labelled as GMO-Free? Allowing that labelling incurs no cost on the GMO producers, or on any other producer who doesn't bother to add it.
Not quite.
You have told a website that you want to see it. It sends you the page.
Part of that page is information that the website includes content from a third party.
Your browser then goes and asks for the third party content.
If you don't want to see that content, then your browser shouldn't ask for it.
It is quite easy not to, you simply add noscript and adblock. Or apparently, if you are french you can have your ISP block it for you.
It's not as simple as it used to be (unplugging a cable), but as soon as there is a useful reason to do it, how long do you think it will be before somone is selling the service?
Winding back may be difficult, but in this case you will simply be not recording travel.
Best result might be to just halve or quarter the sensor responses, then you can keep track for servicing etc, while still cutting your tax bill.
just charge per number of miles driven per car. report the odometer reading yearly. drive more, pay more. this will encourage both more fuel efficient cars and living closer to work.
No, this will encourage disconnecting the odometer.
Careen over the fiscal cliff?
That word doesn't mean what you think it means. Unless you mean the US was run up on a beach for the fouling to be removed from its hull. Perhaps you meant (or the Editor meant) career?
It is also used to mean tilt or lean while in motion.
Your definition does seem oddly appropriate though.
Free speech didn't kill people in Jonestown. In each case it was either suicide by cyanide, or murder by the men with guns who forced the unwilling to drink it.
He did exist. I've seen the documentary http://www.imdb.com/title/tt0311361/
Personally, if I'm going to be nailed to a cross I would want it to be so badly constructed it would fall apart.
Anyway, isn't nailing to a cross an easter discussion? We should be talking about God nailing Mary.
Safer from people maybe, but homicide figures don't count the spiders, snakes, drop bears, crocodiles, and sharks. Also you have to eat vegemite or we kick you out again.
What we really need is to find a nice largish asteroid (200 - 600 metres) that is going to make a close approach in 10 to 20 years, then hit a few years later. It would divert a lot of resources from the war on X and into space development. Bonus points if the delta V to capture it is achievable.
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation
Note that it says person, not citizen. Your constitution clearly specifies when it applies to citizens only vs when it applies to everyone. If doing it to Americans is wrong, then so is doing it to non-Americans.
Since there is no declaration of war, the possible exception is the "public danger" clause. If it applies, then it applies to everyone.
It could easily be argued that blowing up a US citizen terrorist is less a violation of the constitution than blowing up some non-threatening goat herder on the other side of the world.
If you really want to see disgusting behavior that should get your politicians charged with murder, look up the "double-tap" strategy.
Meanwhile we are using drone strikes on American citizens without even a facade of due process...
You know, this is the attitude that pisses off most of the rest of the world. You don't even consider that using drone strikes against people who are not US citizens might be wrong.
It's all "Oh no, Obama blew up an American, how terrible". Never mind the Afghan, Iraqi, and Pakistani kids being blown to bits, they're brown and not American so they don't matter.
Thanks. I used to like GQview, but i thought it just went away. Installing now. :)
Yeah, they mostly filled it. But it got a lot harder to find, and is much more focussed on the in crowd at that site.
The other thing is the enthusiasm of the amatuers is gone. It was a once off thing - people were introduced to the internet and it was this wonderful new landscape that was mostly empty, and they went looking for things to fill it. Yeah a lot of it was crap, but it was every type of crap in the world.
Now, it's all targeted at higher rankings and google ad revenue. The internet has gone from a vast conversation to being ten million channels of TV.
There is a post further down that talks about S/N ratio. He's right, the signal is mostly still there, but the noise is deafening.
You may laugh about the crappy eye-hurting design, but when we lost geocities and similar amateur websites we lost a lot of information that isn't on the web anywhere else.
Manufactures and tech websites can give you the specs on things, but Joe Blow in his garage pulling apart a blender and posting the pics would (accidently sometimes) show how to open it without breaking the internal clips.
There was a lot of information on damn near anything if you knew how to search for it. Now everything is a bland advertisement or a repost of the same list of data over and over. SEO just about finished it off.
So you're saying it is immoral.
But put some makeup on first: http://cyberpunk2020.de/2010/04/28/anti-face-recognition-makeup/
Not targeted enough. The chance that you get two identical emails from different sources and notice something's amiss is way too high.
Not if they all know each other. At one place I used to work, people would forward emails all over the place, to both internal and external contacts.
If something was really funny or very relevent to the work, the popular people would see multiple copies as everyone sent it to them.
Funniest thing was that there was a poorly enforced policy about spamming, so nobody forwarded them to IT. If it was malware it usually got everybody before IT even knew about it.
It's pretty obvious that the heavier one is the evil Higgs. From this we can deduce that the mass of a subatomic goatee travelling almost at lightspeed is at least 3GeV.
Somebody doesn't understand how tides work. Are you a Pierson's Puppeteer?