Good point. I wasn't sure if the cylindrical shell would be hollow or solid so I went with the easier calculation. I guess if it was a hollow shell, the calculation would be a little more difficult because the cross sectional area would involve more than just pi*r^2. It would likely increase the resistance of the cylinder which would mean more power.
If it's a shell of only 1 cm thick, the power produced would increase a little more than 100 times.
Re:Power Calculation
on
19 million Amps
·
· Score: 2, Interesting
Let me make a correction. I used a soup can when they said tuna can. My mistake. Assume a tuna can of dimensions of dimensions .0381m length and.04206m diameter. That would lower the resistance of the aluminum to.781x10^-9 (I also forgot some decimal places in my previous equation:P). That means the total power would be:
(12x10^6)^2*(.781x10-9) = 112.464kW.
That's not much power. In addition, it only lasted a few milliseconds so it wouldn't come close to the total power usage of the world in a year.
Power Calculation
on
19 million Amps
·
· Score: 4, Informative
If we consider the resistivity of Aluminum as 2.82x10^-8 Ohm-meters and the dimension of a soup can is.2159m length by.0889m diameter, we can calculate the approximate resistance of the aluminum and therefore the power.
resistance = resistivity*length/area
It turns out that the resistance is near 1 ohm at.981 Ohms. This means that the power would be found with the following equation.
P = I^2*R
Therefore we can estimate the total power to be a huuuuuge amount, 354.14x10^12 Watts.
The article says the entire trip would last a fortnight. This would be a long vacation and would be the biggest incentive to pay the 100 mil. I know they aren't landing on the moon, but 2 weeks is still a long time to spend in space. The apollo 11 mission only took 8 days and they landed. Of course, they didn't spend a week at a space station.
Alternatively, a cruise usually lasts 1-2 weeks . Which is a better use of your money?
I wonder why people don't seem to realize that the taskbar is meant to solve these multiple window problems. It works the same way. If you are dragging an object, simply drag it over the corresponding taskbar entry for the destination window and that window will come to the front of the screen. Now the flaw of this is if you want to drag to the desktop, but let's just ignore that situation for now;)
(Of course you could just press Windows + D while dragging, but that defeats the idea of using only mouse or only keyboard)
The standard for POE is very explicit in the supply voltage and current. It should be capable of supplying 48-56VDC at up to 350mA (I think that's the current spec.). You wouldn't be pushing the typical AC power over a POE line. It's a low power standard, but should be sufficient to power phones or even efficient laptops.
Most young kids today couldn't care less about doom because a lot of them weren't around when the game was actually cool
Of course this movie isn't targeted to young kids. It's rated R. That means the majority of people who should watch it are old enough to remember the hype from the original, and maybe the nostalgia would be a big draw.
It was on NBC, but only as a review of season 1. I'm not sure if they'll continue running reruns, but the play time that it did get is basically a setup for the new season. It was actually last week that they ran the shows. It's a good marketing strategy I think even if the new stuff is only on SciFi.
Yeah, Unfortuately I'll be going out to the baseball game tonight and then to the bars after that. And to top it all off, I don't have internet at my house yet because the cable company doesn't offer it yet(the dark age of cleveland). That means no live viewing and no downloading.
However, there is still hope. I'm going to dust off the old VHS and fire up the record timer. It's been years since I've done this. I hope I can remember how. Any suggestions?;)
Damn how did a person like me ever get an account on slashdot.
She represents the worst of the Democrats in that she doesn't have any positions that won't change based on tomorrow's opinion poll. Not only that, she repesents the "government knows better than you" wing as well.
Aren't these two points of view exclusive? If the government knows better than you, they should not care what polls say. Instead, they will do what is "right" in their eyes and the public opinion be damned. I understand your description and it does seem to describe Hillary accurately enough, but perhaps you should mention that the reason she believes "government knows better" is that public opinion is such that they want government interference to "protect" our children.
This is difficult to express in a clear manner. Someone help me out.
All good questions. I might agree with the deadline(as if my opinion mattered in the decision) only if there is some justification for the cancelling of analog broadcasts. What is the newly freed bandwidth going to be used for? I already know about the BIG GOV. selling to BIG CORP. to screw little me, but if there are any additional legitimate, non-typical/. explanations please share.
There does seem to be a very important point missing to this comment. With cable boxes, the only people who bought them were those who decided they wanted extra channels. The choice was still available if they wanted to continue watching TV on their old B&W machine as they had been doing for years. Now, you will NEED to buy a DTV to Analog conversion kit of some kind in order to watch any TV at all.
Even today, someone somewhere is still content to watch TV from open air broadcasts on their tiny B&W set. In 2009 they will no longer be able to do that, and will have to either go out and buy something that costs more than their TV set does, or watch nothing at all.
As a nerd, I would love to embrace the new technology, but I'm sure, as unlikely as it seems, there are people who are content with their current generation of tech.
So yes, each and every line has been verified, but not much math is involved.
Perhaps, but it is pretty impressive to see the capabilities of modern PLC's. Some analog feedback and trending of the coaster performance can be easily compared in the PLC which can then adjust the launcher as necessary probably by changing parameters in a drive. The entire system may become quite complex, but it's very cool to see it all together because the operation is typically a very logical step by step process.
Of course, PLC's were designed specifically to replace relays. Relays are a pain to troubleshoot and are very difficult to make changes to. PLC's may add a bit of software to simulate and we all are afraid of buggy software, but the design is meant to be rock solid. In the event of a failure, there are plenty of fault handling options that can be set to ensure proper shut down of the machine.
I work at Rockwell Automation (Allen Bradley), and we do many of the controls for amusement park rides. The systems are designed to be rock solid and rarely fail. When they do, there are plenty of fault handling operations available to ensure that a failure is not dangerous. Also, with all the data monitoring, it is likely that problems can be detected before they can cause a true failure.
About the programming and hardware typcally used. Allen Bradley makes multiple types of controllers. There are basically 3 main platforms used: PLC-5, SLC500/micrologix, and Logix. A roller-coaster would most likely use a combination of SLC and Logix controllers. Each controller is designed for different levels of operation. The Logix platform controllers usually are the high end and are probably the controllers that would analyze the data from the remote sensors. The logix controllers use a 32 bit system, but performance is not meant to be comparable to a PC. Rather, they are designed to be basically bulletproof in operation.
With just 300 sensors, the SLC could easily handle the inputs, but since it is a newer coaster, it is likely that there is at least 1 Logix processor in the system.
global warming only happens in some neighbourhoods around Cleveland
Man! how'd you know? We've been having a few weeks of unconventionally hot weather! Now I know why. Oh boy and the humidity is killer. I better stop driving my car around to remedy the situation.
Most studies from what I can remember show that sleep duration is subjective to the individual, but on average 8-9 hours of sleep is sufficient. The subjectiveness is probably why I prefer 9+ while some of my friends go 7-8 per night.
I wonder if it is a good idea to exercise before eating breakfast. Does anyone know if this is good or bad? I find that I will often do much better in sporting events in the late afternoon or evening if I have a good meal with a short time in between to digest it. That leads me to believe that it's best to eat first exercise later, but that's in the afternoon/evening.
LSD is completely nonaddictive. Alcohol withdrawal can kill an individual.
You have got to be kidding me. What the heck is alcohol withdrawal? Alcohol has no addictive substances. By addictive I mean it does not alter the bodies chemistry in such a way that the substance becomes necessary to operate normally. When has a person suffered from alcohol withdrawal other than in a psychological sense? Perhaps you should refrain from using the LSD.
Slashdot Mirror
If it's a shell of only 1 cm thick, the power produced would increase a little more than 100 times.
(12x10^6)^2*(.781x10-9) = 112.464kW.
That's not much power. In addition, it only lasted a few milliseconds so it wouldn't come close to the total power usage of the world in a year.
resistance = resistivity*length/area
It turns out that the resistance is near 1 ohm at .981 Ohms. This means that the power would be found with the following equation.
P = I^2*R
Therefore we can estimate the total power to be a huuuuuge amount, 354.14x10^12 Watts.
Alternatively, a cruise usually lasts 1-2 weeks . Which is a better use of your money?
Tell me about the fucking golf shoes!!
I think facebook is still reaching the maximum point of its fadness, but I agree it is very much a powerful fad.
Are you attempting to define Life, Liberty, and the pursuit of happiness?
(Of course you could just press Windows + D while dragging, but that defeats the idea of using only mouse or only keyboard)
Half-Life, Doom, Quake, Unreal, Halo, Battlefield, etc. Do you get the picture? :P
The standard for POE is very explicit in the supply voltage and current. It should be capable of supplying 48-56VDC at up to 350mA (I think that's the current spec.). You wouldn't be pushing the typical AC power over a POE line. It's a low power standard, but should be sufficient to power phones or even efficient laptops.
Of course this movie isn't targeted to young kids. It's rated R. That means the majority of people who should watch it are old enough to remember the hype from the original, and maybe the nostalgia would be a big draw.
It was on NBC, but only as a review of season 1. I'm not sure if they'll continue running reruns, but the play time that it did get is basically a setup for the new season. It was actually last week that they ran the shows. It's a good marketing strategy I think even if the new stuff is only on SciFi.
However, there is still hope. I'm going to dust off the old VHS and fire up the record timer. It's been years since I've done this. I hope I can remember how. Any suggestions? ;)
Damn how did a person like me ever get an account on slashdot.
Aren't these two points of view exclusive? If the government knows better than you, they should not care what polls say. Instead, they will do what is "right" in their eyes and the public opinion be damned. I understand your description and it does seem to describe Hillary accurately enough, but perhaps you should mention that the reason she believes "government knows better" is that public opinion is such that they want government interference to "protect" our children.
This is difficult to express in a clear manner. Someone help me out.
Even today, someone somewhere is still content to watch TV from open air broadcasts on their tiny B&W set. In 2009 they will no longer be able to do that, and will have to either go out and buy something that costs more than their TV set does, or watch nothing at all.
As a nerd, I would love to embrace the new technology, but I'm sure, as unlikely as it seems, there are people who are content with their current generation of tech.
Perhaps, but it is pretty impressive to see the capabilities of modern PLC's. Some analog feedback and trending of the coaster performance can be easily compared in the PLC which can then adjust the launcher as necessary probably by changing parameters in a drive. The entire system may become quite complex, but it's very cool to see it all together because the operation is typically a very logical step by step process.
Of course, PLC's were designed specifically to replace relays. Relays are a pain to troubleshoot and are very difficult to make changes to. PLC's may add a bit of software to simulate and we all are afraid of buggy software, but the design is meant to be rock solid. In the event of a failure, there are plenty of fault handling options that can be set to ensure proper shut down of the machine.
About the programming and hardware typcally used. Allen Bradley makes multiple types of controllers. There are basically 3 main platforms used: PLC-5, SLC500/micrologix, and Logix. A roller-coaster would most likely use a combination of SLC and Logix controllers. Each controller is designed for different levels of operation. The Logix platform controllers usually are the high end and are probably the controllers that would analyze the data from the remote sensors. The logix controllers use a 32 bit system, but performance is not meant to be comparable to a PC. Rather, they are designed to be basically bulletproof in operation.
With just 300 sensors, the SLC could easily handle the inputs, but since it is a newer coaster, it is likely that there is at least 1 Logix processor in the system.
Heck yeah! I wouldn't take my tourist trip to the moon unless they had a China Buffet there so I could stuff my face silly. I can't wait.
Man! how'd you know? We've been having a few weeks of unconventionally hot weather! Now I know why. Oh boy and the humidity is killer. I better stop driving my car around to remedy the situation.
My question is, who "came" first?
Most studies from what I can remember show that sleep duration is subjective to the individual, but on average 8-9 hours of sleep is sufficient. The subjectiveness is probably why I prefer 9+ while some of my friends go 7-8 per night.
I wonder if it is a good idea to exercise before eating breakfast. Does anyone know if this is good or bad? I find that I will often do much better in sporting events in the late afternoon or evening if I have a good meal with a short time in between to digest it. That leads me to believe that it's best to eat first exercise later, but that's in the afternoon/evening.
You have got to be kidding me. What the heck is alcohol withdrawal? Alcohol has no addictive substances. By addictive I mean it does not alter the bodies chemistry in such a way that the substance becomes necessary to operate normally. When has a person suffered from alcohol withdrawal other than in a psychological sense? Perhaps you should refrain from using the LSD.