Even if you were to say that your Escalade itself is technically more efficient than the Jet for that 3000 miles, the fact that the Escalade will take a week vs. 5 hours for the jet should account for something. Some questions:
1) Should you have to account for the fuel used to transport the extra week of food that the Escalade riders are consuming for their journey?
2) Should you have to account for the fact that if everybody switched to SUVs for cross-country journeys, congestion would increase and therefore mileage would decrease?
3) Should you have to account for the fact that on a 3000 mile journey, the A/C, stereo and entertainment devices being charged that are freely available on a plane will also be in use in the Escalade, and will likely decrease it's mpg by 10% or more?
I say probably. However, I'd also wager that the ICE trains in Germany which are purely electric and can carry 1000 people at 300kph are most efficient.
a) I've never heard of this, and b) even if it's true I don't see why their retraction would come the day after the Moon landing. We had hundreds of rocket launches (manned or unmanned) prior to that.
A decent ion engine, such as the one which powered Deep Space 1, required most of the spacecraft's 2.4 kW of power, and that was to get a 500kg craft around.
Ion drive thrust increases with power input. So, in order to move an asteroid about within our lifetimes you're probably going to need several football fields of panels, not to mention either a large number of actual engines, or a new breed of them. (And try getting all that to the asteroid in the first place).
The whole benefit of ion engines is that you require less fuel on your spacecraft due to higher isp. If you can figure out how to use materials on the asteroid for chemical rockets, do it.. if you don't, you're still going to be pushing that mass with an ion engine anyway.
Lead and other high-atomic number elements have the worst Bremmstrahlung ("breaking radiation") yields. This is what makes materials like water, aluminum, and polymers better for shielding against ionizing radiation.
Not that I've personally worked out the delta-V numbers, but I'm pretty sure you could get a vehicle up to speed to achieve LEO quite easily if you wanted to stop there on your elevator trip.
Clearly, we already accelerate people to the necessary 7.75 km/s or so from the ground. In this case, although you're starting from essentially the same tangential speed (that 400km gets you about 1% extra vs. sea-level), you're already at 400km or so (which has near zero drag), which means that you'll need much less fuel to achieve the same speed required for LEO. In addition to that, the thrust of rocket engines is increased in a vacuum due to lack of atmospheric effets (assuming they are designed for this).
As an example, from what I recall the shuttle expends 50% of it's fuel in about the first minute of flight due to heavy drag at sea-level.
No, because (in the U.S., at least), the best we've been able to do is reduce the rate at which greenhouse gas emissions are increasing. Our total emissions are still increasing every year, which is mostly due to the fact that our population is still growing every year. I believe per-capita emissions are slowly dropping, but our population is still increasing more rapidly.
Yeah, I really don't think these people are zealots against voting technology. Seriously, did you watch the show? They directly contradicted statements from Diebold and government officials throughout, namely the chief Diebold engineer's statement that "No, you cannot change the vote totals with just the memory card," which they clearly did.
I'm pretty sure that if you or I were the one dealing with it all, having others directly lie to our faces and accusing us of stealing their source code when they had it freely available on a public FTP, we'd be pretty upset too.
I personally can't understand why anybody would want FM on ANY mp3 player. Aren't you listening to your own music because you don't like what they're playing on the radio?
Um, I don't think they meant 21 mpg for American cars. They meant 21 mpg for all cars in America, which as you may know, contains a huge chunk of Asian and some European companies. Now, the Asian companes are somewhat better, but it's not as much a matter of engineering so much as it is consumer trends. My pontiac Grand Prix gets about 21 mpg on average, but it's also a 3500 pound car with a 3.8 liter engine. It's not like some British company is making the same car that gets 50% better mileage.
The average american car gets lower mileage because our cars are too big. A Mini Cooper is one of the tinyest cars on the road here, but in Europe it looks like a midsize sedan, and it still only gets 25/32. A Toyota corolla gets something around 32/41, and is bigger. The Japanese, especially Toyota, pwn everybody.
Anyway, the point is that I have to pay a lot for gas mostly because I inherited a huge car that from my dad that I don't need (though it does seem like caveman technology in many other ways).
I do not care enough about changing your mind to dive into a war over this, but I'd like to point out that the first shuttle disaster, the failure of Challenger's SRB O-rings, was chiefly caused by administrative problems with Thiokol. Namely, that they ignored one engineer's warnings about there being a possible problem. Oh, isn't that always the case.
Other examples of this theme would be the cargo hatch on the DC-10 and of course, the Columbia disaster
... That many of you are assholes. I'm sure your physical science course at Ithaca Community College gives you the necessary qualifications to fix the entire shuttle program with a two sentence/. post.
1. Just because the escape velocity at Europe might be less than 24 km/s doesn't mean that's your orbital velocity at that altitude above Jupiter; such would only be the case if the object's initial velocity (w/ respect to Jupiter) was 0 at the edge of Jupiter's sphere of influence.
2. It's possible their simulation was for a retrograde impact on Europa, which would enable a much higher impact velocity (Europa's mean orbital speed is over 13 km/s).
Uh, he clearly said it's because Google has a proven track record with handling privacy and security. He also clearly said that if they ceased to continue with said track record, he would no longer "consume their goods and services." If you can't trust a person/group/company based on their actions, what the hell are you supposed to judge them by?
If you eat a lot of Del Monte pineapples and they always taste good and you never get sick, that means you trust them to provide you a pleasant pineapple-eating experience. Right?
All I was saying is, this "conversion" is really just them adding stuff that most other libraries, like ours, have on one floor. it was my understanding that all libraries have these facilities anyway, save perhaps for the cafe.
why?
my school's (cal poly slo) library has 2 labs with about 100 computers, we have laptops available, and lots of tables, group rooms, and comfy chairs.
we also have 4 stories of books above that.
you're telling me a cal state school has a bigger library than UT?
Slashdot Mirror
Even if you were to say that your Escalade itself is technically more efficient than the Jet for that 3000 miles, the fact that the Escalade will take a week vs. 5 hours for the jet should account for something. Some questions:
1) Should you have to account for the fuel used to transport the extra week of food that the Escalade riders are consuming for their journey?
2) Should you have to account for the fact that if everybody switched to SUVs for cross-country journeys, congestion would increase and therefore mileage would decrease?
3) Should you have to account for the fact that on a 3000 mile journey, the A/C, stereo and entertainment devices being charged that are freely available on a plane will also be in use in the Escalade, and will likely decrease it's mpg by 10% or more?
I say probably. However, I'd also wager that the ICE trains in Germany which are purely electric and can carry 1000 people at 300kph are most efficient.
Oh, I found it. To be fair, the original statement appears to have been made in the 1920s.
Times Wiki
a) I've never heard of this, and b) even if it's true I don't see why their retraction would come the day after the Moon landing. We had hundreds of rocket launches (manned or unmanned) prior to that.
Link?
Power is anything but cheap, especially in space.
A decent ion engine, such as the one which powered Deep Space 1, required most of the spacecraft's 2.4 kW of power, and that was to get a 500kg craft around.
Ion drive thrust increases with power input. So, in order to move an asteroid about within our lifetimes you're probably going to need several football fields of panels, not to mention either a large number of actual engines, or a new breed of them. (And try getting all that to the asteroid in the first place).
The whole benefit of ion engines is that you require less fuel on your spacecraft due to higher isp. If you can figure out how to use materials on the asteroid for chemical rockets, do it.. if you don't, you're still going to be pushing that mass with an ion engine anyway.
You are incorrect.
Lead and other high-atomic number elements have the worst Bremmstrahlung ("breaking radiation") yields. This is what makes materials like water, aluminum, and polymers better for shielding against ionizing radiation.
Not that I've personally worked out the delta-V numbers, but I'm pretty sure you could get a vehicle up to speed to achieve LEO quite easily if you wanted to stop there on your elevator trip. Clearly, we already accelerate people to the necessary 7.75 km/s or so from the ground. In this case, although you're starting from essentially the same tangential speed (that 400km gets you about 1% extra vs. sea-level), you're already at 400km or so (which has near zero drag), which means that you'll need much less fuel to achieve the same speed required for LEO. In addition to that, the thrust of rocket engines is increased in a vacuum due to lack of atmospheric effets (assuming they are designed for this). As an example, from what I recall the shuttle expends 50% of it's fuel in about the first minute of flight due to heavy drag at sea-level.
No, because (in the U.S., at least), the best we've been able to do is reduce the rate at which greenhouse gas emissions are increasing. Our total emissions are still increasing every year, which is mostly due to the fact that our population is still growing every year. I believe per-capita emissions are slowly dropping, but our population is still increasing more rapidly.
Yeah, I really don't think these people are zealots against voting technology. Seriously, did you watch the show? They directly contradicted statements from Diebold and government officials throughout, namely the chief Diebold engineer's statement that "No, you cannot change the vote totals with just the memory card," which they clearly did.
I'm pretty sure that if you or I were the one dealing with it all, having others directly lie to our faces and accusing us of stealing their source code when they had it freely available on a public FTP, we'd be pretty upset too.
Valve announced today that the wood texture on the AK-47 in Counterstrike will be made slightly darker.
So if my pumpkin reaches orbit, circles in LEO for 10 years and then goes through re-entry, I get a distance of...
40076 km/orbit * +/- 16 orbits/day * 365 days * 10 years = 2.34 billion kilometers.
I win.
I personally can't understand why anybody would want FM on ANY mp3 player. Aren't you listening to your own music because you don't like what they're playing on the radio?
This brought a tear to my eye as well.. one of joy.
Um, I don't think they meant 21 mpg for American cars. They meant 21 mpg for all cars in America, which as you may know, contains a huge chunk of Asian and some European companies. Now, the Asian companes are somewhat better, but it's not as much a matter of engineering so much as it is consumer trends. My pontiac Grand Prix gets about 21 mpg on average, but it's also a 3500 pound car with a 3.8 liter engine. It's not like some British company is making the same car that gets 50% better mileage.
The average american car gets lower mileage because our cars are too big. A Mini Cooper is one of the tinyest cars on the road here, but in Europe it looks like a midsize sedan, and it still only gets 25/32. A Toyota corolla gets something around 32/41, and is bigger. The Japanese, especially Toyota, pwn everybody.
Anyway, the point is that I have to pay a lot for gas mostly because I inherited a huge car that from my dad that I don't need (though it does seem like caveman technology in many other ways).
I do not care enough about changing your mind to dive into a war over this, but I'd like to point out that the first shuttle disaster, the failure of Challenger's SRB O-rings, was chiefly caused by administrative problems with Thiokol. Namely, that they ignored one engineer's warnings about there being a possible problem. Oh, isn't that always the case.
Other examples of this theme would be the cargo hatch on the DC-10 and of course, the Columbia disaster
... That many of you are assholes. I'm sure your physical science course at Ithaca Community College gives you the necessary qualifications to fix the entire shuttle program with a two sentence /. post.
Give us engineers some fucking credit please.
I believe it's called a "micro-scope" Microscope
Popular Mechanics hasn't covered this one yet as it's only been around for about 400 years
1. Just because the escape velocity at Europe might be less than 24 km/s doesn't mean that's your orbital velocity at that altitude above Jupiter; such would only be the case if the object's initial velocity (w/ respect to Jupiter) was 0 at the edge of Jupiter's sphere of influence.
2. It's possible their simulation was for a retrograde impact on Europa, which would enable a much higher impact velocity (Europa's mean orbital speed is over 13 km/s).
Uh, he clearly said it's because Google has a proven track record with handling privacy and security. He also clearly said that if they ceased to continue with said track record, he would no longer "consume their goods and services." If you can't trust a person/group/company based on their actions, what the hell are you supposed to judge them by?
If you eat a lot of Del Monte pineapples and they always taste good and you never get sick, that means you trust them to provide you a pleasant pineapple-eating experience. Right?
fuck yeah.. i wrote most of that mpd article
(BUT PERFORMANCE IS LACKING)
probably not going to make it, eh...
regenerate your cock if a crazy lover slices it off
Guess I misread this
Uh. Rutan is partnered with Virgin. Yet he and scaled composites are also a member of t/Space. How can they compete against eachother?
All I was saying is, this "conversion" is really just them adding stuff that most other libraries, like ours, have on one floor. it was my understanding that all libraries have these facilities anyway, save perhaps for the cafe.
/. headline
its really just another crappy
why? my school's (cal poly slo) library has 2 labs with about 100 computers, we have laptops available, and lots of tables, group rooms, and comfy chairs.
we also have 4 stories of books above that.
you're telling me a cal state school has a bigger library than UT?