superleccy
Sep 20, 06:14 AM
All these calls for adding tuners, hard drives and burners are missing the point. Those functions belong in the host computer. iTV is just a method of getting the content from your Mac/PC to your stereo or TV.
Agreed. If you want a Mac Mini on the shelf under your TV, then, er, buy a Mac Mini!
If it's got a hard disk in it that's used for anything more than caching your iTunes Library file and thumbnails, I'd be very surprised.
Agreed again. If the HD was to be used for anything more than this, Steve would have made a bigger deal of it at the presentation.
Cheers!
SL
Agreed. If you want a Mac Mini on the shelf under your TV, then, er, buy a Mac Mini!
If it's got a hard disk in it that's used for anything more than caching your iTunes Library file and thumbnails, I'd be very surprised.
Agreed again. If the HD was to be used for anything more than this, Steve would have made a bigger deal of it at the presentation.
Cheers!
SL
Peterkro
Mar 14, 12:01 PM
And gravity has yet to go up. :p LOL
While the idea is ridiculous Lewis Carroll (who was a mathematician amongst other things:rolleyes:) did some work on the problem and in a fictional work came up with this:
"In Chapter 7 of Lewis Carroll's 1893 book Sylvie and Bruno. The fictional German professor, Mein Herr, proposes a way to run trains by gravity alone. Dig a straight tunnel between any two points on Earth (it need not go through the Earth's center), and run a rail track through it. With frictionless tracks the energy gained by the train in the first half of the journey is equal to that required in the second half. And also, in the absence of air resistance and friction, the time of the journey is about 42 minutes (84 for a round trip) for any such tunnel, no matter what the tunnel's length."
f
While the idea is ridiculous Lewis Carroll (who was a mathematician amongst other things:rolleyes:) did some work on the problem and in a fictional work came up with this:
"In Chapter 7 of Lewis Carroll's 1893 book Sylvie and Bruno. The fictional German professor, Mein Herr, proposes a way to run trains by gravity alone. Dig a straight tunnel between any two points on Earth (it need not go through the Earth's center), and run a rail track through it. With frictionless tracks the energy gained by the train in the first half of the journey is equal to that required in the second half. And also, in the absence of air resistance and friction, the time of the journey is about 42 minutes (84 for a round trip) for any such tunnel, no matter what the tunnel's length."
f
more...
ct2k7
Apr 24, 10:13 PM
no, i haven't been "infringed" by something lol.
i said the ahmadiyyah, a religious minority, are persecuted in indonesia. you said they're not muslims, as if that justifies their persecution.
do you understand now?
Erm, nope - not abuse - infringed by religion.
You didn't mention Indonesia.
Nothing justifies persecution, nor does belief in a religion :)
Right, I'm off to catch a flight home.
Cya laters!
i said the ahmadiyyah, a religious minority, are persecuted in indonesia. you said they're not muslims, as if that justifies their persecution.
do you understand now?
Erm, nope - not abuse - infringed by religion.
You didn't mention Indonesia.
Nothing justifies persecution, nor does belief in a religion :)
Right, I'm off to catch a flight home.
Cya laters!
likemyorbs
Mar 25, 10:36 AM
PS Marriage is a privilege not a right.
Are you speaking religiously or legally? By law, it is a right. However if the church doesn't want to marry gay couples, that's their own stupid business.
Are you speaking religiously or legally? By law, it is a right. However if the church doesn't want to marry gay couples, that's their own stupid business.
more...
*LTD*
Apr 9, 12:51 AM
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Mobile/8G4)
These people are fleeing the "yellow light of death� on PS3 or "red ring of death' on 360.
That's a complete joke, surely? There's no way you can compare console gaming, in basically a home arcade, to swiping your fingers around on a 3.5" screen. No way. I am a gamer, and always will be.
Gaming on the iPhone is good for 2-minute bursts, such as when sitting on the toilet. It's not a great games device. Most of the games are cheap with no replay value.
Oops. Looks like someone hasn't visited the App Store in like, never.
Since you're still in can you grab me a Palm Centro? I'm feelin nostalgic.
These people are fleeing the "yellow light of death� on PS3 or "red ring of death' on 360.
That's a complete joke, surely? There's no way you can compare console gaming, in basically a home arcade, to swiping your fingers around on a 3.5" screen. No way. I am a gamer, and always will be.
Gaming on the iPhone is good for 2-minute bursts, such as when sitting on the toilet. It's not a great games device. Most of the games are cheap with no replay value.
Oops. Looks like someone hasn't visited the App Store in like, never.
Since you're still in can you grab me a Palm Centro? I'm feelin nostalgic.
Huntn
Mar 11, 06:08 PM
Not one but two reactors could be headed for meltdown. U.S. Rushes Coolant to Japan Nuclear Plant to Prevent Meltdown (http://theextinctionprotocol.wordpress.com/2011/03/11/u-s-rushes-coolant-to-japan-nuclear-plant-to-prevent-a-meltdown/). Primary power was lost. A backup generator failed to start. Plant is venting radioactive steam... God, I hope this does not happen.
11.31am: The Associated Press has more details on the state of emergency issued at nuclear plant after its cooling system failed:
Chief cabinet secretary Yukio Edano says the nuclear power plant in Fukushima developed a mechanical failure in the system needed to cool the reactor after it was shut down in Friday's earthquake.
He said the measure was a precaution and there was no radiation leak at the Fukushima No. 1 power plant. He said the facility was not in immediate danger.
----------------------------------------------
Thats pretty bloody serious.... eeeek :eek:
11.31am: The Associated Press has more details on the state of emergency issued at nuclear plant after its cooling system failed:
Chief cabinet secretary Yukio Edano says the nuclear power plant in Fukushima developed a mechanical failure in the system needed to cool the reactor after it was shut down in Friday's earthquake.
He said the measure was a precaution and there was no radiation leak at the Fukushima No. 1 power plant. He said the facility was not in immediate danger.
----------------------------------------------
Thats pretty bloody serious.... eeeek :eek:
more...
Max on Macs
Jul 12, 03:08 AM
I personally believe that in an effort to cut noise and heat on these higher priced machines, two problems that have always plagued them, the Pentium 66 and 75 will be in use in these systems.
more...
Cutwolf
Mar 18, 11:30 AM
Found it:
"Furthermore, plans (unless specifically designated for tethering usage) cannot be used for any applications that tether the device (through use of, including without limitation, connection kits, other phone/smartphone to computer accessories, BLUETOOTH� or any other wireless technology) to Personal Computers (including without limitation, laptops), or other equipment for any purpose. Accordingly, AT&T reserves the right to (i) deny, disconnect, modify and/or terminate Service, without notice, to anyone it believes is using the Service in any manner prohibited or whose usage adversely impacts its wireless network or service levels or hinders access to its wireless network, including without limitation, after a significant period of inactivity or after sessions of excessive usage and (ii) otherwise protect its wireless network from harm, compromised capacity or degradation in performance, which may impact legitimate data flows."
Interesting. All AT&T has to do is believe you're tethering and they can modify your plan? I'm going to keep tethering, and if they try to change my plan, get out of my contract with no ETF. Id also be very curious to see how the "believe" provision would hold up in court if they had no other proof than an increase in data usage. I'm guessing not very well.
"Furthermore, plans (unless specifically designated for tethering usage) cannot be used for any applications that tether the device (through use of, including without limitation, connection kits, other phone/smartphone to computer accessories, BLUETOOTH� or any other wireless technology) to Personal Computers (including without limitation, laptops), or other equipment for any purpose. Accordingly, AT&T reserves the right to (i) deny, disconnect, modify and/or terminate Service, without notice, to anyone it believes is using the Service in any manner prohibited or whose usage adversely impacts its wireless network or service levels or hinders access to its wireless network, including without limitation, after a significant period of inactivity or after sessions of excessive usage and (ii) otherwise protect its wireless network from harm, compromised capacity or degradation in performance, which may impact legitimate data flows."
Interesting. All AT&T has to do is believe you're tethering and they can modify your plan? I'm going to keep tethering, and if they try to change my plan, get out of my contract with no ETF. Id also be very curious to see how the "believe" provision would hold up in court if they had no other proof than an increase in data usage. I'm guessing not very well.
more...
javajedi
Oct 11, 12:50 PM
http://members.ij.net/javajedi
You're more than welcome to download the Java version, or the Mac OS X native one. When I said C, I really should clarify. It's actually a Cocoa version so the source is a .m objective c file, however the math function itself is from the C library. It's really cool how in objective c you can use regular C :)
For integer testing:
int x1,x2,x3;
for (x1=1; x1<=20000; x1++) {
Coating, Gastonia, NC
more...
Gastonia, North Carolina Real
more...
View Gastonia, NC Detailed
Gastonia, North Carolina
more...
South Gastonia, North Carolina
Gastonia North Carolina.
Gastonia North Carolina.
more...
Gastonia, North Carolina
Gastonia, North Carolina
more...
Zip: 28054 City: Gastonia, NC
more...
more...
more...
more...
You're more than welcome to download the Java version, or the Mac OS X native one. When I said C, I really should clarify. It's actually a Cocoa version so the source is a .m objective c file, however the math function itself is from the C library. It's really cool how in objective c you can use regular C :)
For integer testing:
int x1,x2,x3;
for (x1=1; x1<=20000; x1++) {
Multimedia
Jul 13, 06:10 AM
I've been wondering about this too. Surely they have the source code (or most of it) written in a high level language, right? If I'm not totally mistaken, there shouldn't be that much more work involved than a re-compilation for x86. Even if some filters or other stuff are hand coded in assembler, they already have that code in x86-assembler in the Windows version.Adobe made a strategic decision to go Universal with the CS3 Suite next year and meanwhile not to divert work to Universalize the CS2 Suite. If you need Adobe stuff all the time, just get a G5 Quad and you will be happy as a clam. It's still going to be the second fastest Mac after Mac Pros are out. :)
more...
skunk
Mar 24, 07:14 PM
"When they express their moral beliefs or beliefs about human nature ... they are stigmatised, and worse -- they are vilified, and prosecuted.
"These attacks are violations of fundamental human rights and cannot be justified under any circumstances," Tomasi said. Great description of their own behaviour, justified by a 2,500-year-old book of revisionist history. Anyway, what exactly was the relationship between David and Jonathan?
"These attacks are violations of fundamental human rights and cannot be justified under any circumstances," Tomasi said. Great description of their own behaviour, justified by a 2,500-year-old book of revisionist history. Anyway, what exactly was the relationship between David and Jonathan?
more...
ddtlm
Oct 12, 06:35 PM
MacCoaster:
Ok, here we go. You have a program.c so compile it into compiler.o like this:
gcc -c program.c
You may place flags such as -O before -c, or maybe even after it. But certainly before it. Anyway, you have some asm_func.asm, so compile it into asm_func.o like this:
nasm -f elf asm_func.asm
Now, you can link these two .o files like this:
gcc *o -o exe
Which makes an executable named exe (which of course you can change to be whatever you want).
Anyway, do note that the ASM funcs do the integer "benchmark" and not the float one. Also, I think because I overwrite ebx when I am not supposed to, the asm routines tend to cause program segaults after they exit. :) But they still provide a valid result. I could fix that, but whatever.
Ok, here we go. You have a program.c so compile it into compiler.o like this:
gcc -c program.c
You may place flags such as -O before -c, or maybe even after it. But certainly before it. Anyway, you have some asm_func.asm, so compile it into asm_func.o like this:
nasm -f elf asm_func.asm
Now, you can link these two .o files like this:
gcc *o -o exe
Which makes an executable named exe (which of course you can change to be whatever you want).
Anyway, do note that the ASM funcs do the integer "benchmark" and not the float one. Also, I think because I overwrite ebx when I am not supposed to, the asm routines tend to cause program segaults after they exit. :) But they still provide a valid result. I could fix that, but whatever.
qubex
Mar 19, 08:52 AM
Apple programmed a flawed system - it's only fair somebody has bothered to exploit it. Maybe now they can rebuild it in a manner that is secure.
more...
Backtothemac
Oct 7, 10:57 AM
Originally posted by TheT
I think Mac users just live in their happy little world and think their computers are still the best... well, wake up!
As of now, PCs kick every Mac's ass, they are just simply faster! Mhz may not matter that much, but a 2Ghz DP compared to a 1.25Ghz DP has to be faster, if you configure it right.
The reason I use a mac is the software, no Windows can beat OSX! And, as a matter of fact, my mac looks better than any of the pcs my friends have...
Um, no. You are wrong. Just because the Intel machine is 2GHZ doesn't mean squat. Pipelines, stages, all of this matters. Don't assume anything about the quality of a 25 year old architecture. X86 blows crap, and always will.
I think Mac users just live in their happy little world and think their computers are still the best... well, wake up!
As of now, PCs kick every Mac's ass, they are just simply faster! Mhz may not matter that much, but a 2Ghz DP compared to a 1.25Ghz DP has to be faster, if you configure it right.
The reason I use a mac is the software, no Windows can beat OSX! And, as a matter of fact, my mac looks better than any of the pcs my friends have...
Um, no. You are wrong. Just because the Intel machine is 2GHZ doesn't mean squat. Pipelines, stages, all of this matters. Don't assume anything about the quality of a 25 year old architecture. X86 blows crap, and always will.
CQd44
May 2, 08:56 AM
"Huge" threat.
About as huge as most windows ones!
About as huge as most windows ones!
NT1440
Mar 16, 10:58 AM
For those of you advocating the elimination or reduction of nuke power, just realize that the only feasible alternative currently is...
Drill baby, drill!
While I have misgivings about Nuclear power I do think it is a good midrange solution to our problems until we can solve our battery problems (thus enabling true renewable energy sources to be viable), drilling isn't a viable solution to anything.
The US doesn't have the resources to provide for our society on our own. Not to mention that the whole process of drilling can take decades (meaning 10+ years, not something like 20+) to play through to the point where steady production can begin. You can't just go out and drill, even if you find something you have to set up the supporting infrastructure first before it is viable.
Drill baby, drill!
While I have misgivings about Nuclear power I do think it is a good midrange solution to our problems until we can solve our battery problems (thus enabling true renewable energy sources to be viable), drilling isn't a viable solution to anything.
The US doesn't have the resources to provide for our society on our own. Not to mention that the whole process of drilling can take decades (meaning 10+ years, not something like 20+) to play through to the point where steady production can begin. You can't just go out and drill, even if you find something you have to set up the supporting infrastructure first before it is viable.
more...
SiliconAddict
Sep 21, 08:48 AM
The more I hear about iTV the lest interested I am in it. I don't need something that integ. with my desktop computer and clogs up my home network. I want a stand alone solution. So it looks like I'm back to building a HTPC sometime next spring. Pitty too. It looks like a slick device. Just not what I'm looking to put under my TV. :(
puma1552
Mar 14, 01:25 AM
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)
You have nothing with no wind.
Even if wind farms were 100% efficient, they don't hold a candle to nuclear output.
Besides, we don't have room here in Japan for wind farms so it makes no difference.
Alternative energy is not a viable source everywhere in the world, plain and simple. That's all I'm saying.
You have nothing with no wind.
Even if wind farms were 100% efficient, they don't hold a candle to nuclear output.
Besides, we don't have room here in Japan for wind farms so it makes no difference.
Alternative energy is not a viable source everywhere in the world, plain and simple. That's all I'm saying.
more...
MacBoobsPro
Sep 20, 04:09 AM
I don't want to have to put yet another box on the shelf under my TV and have yet another remote control kicking around my living room.
I already have a DVD, a VCR, and a Sky+ box (DVR). I know that in theory I should choose just one or two of these, but that doesn't work in practice. What happens when my mum records something on a video for me - I still need a VCR, and until Sky bring out a Sky+ box with a *much* larger hard disk then I'll need a DVD for keeping things long term.
If Apple could include at least a DVD burner and ideally a DVR hard disk as well, then I could actually start replacing the other machines I have rather than just adding to them and cluttering up my living room.
Its probably a moot point anyway as I doubt iTV will be launched in the UK for a long while anyway.
Im hoping Apple bring out a HDTV of there own, with iTV built in. Basically a 50" iMac :D Seriously though that would be cool and I would buy it straight away. Eventually i think thats where Apple will end up.
I already have a DVD, a VCR, and a Sky+ box (DVR). I know that in theory I should choose just one or two of these, but that doesn't work in practice. What happens when my mum records something on a video for me - I still need a VCR, and until Sky bring out a Sky+ box with a *much* larger hard disk then I'll need a DVD for keeping things long term.
If Apple could include at least a DVD burner and ideally a DVR hard disk as well, then I could actually start replacing the other machines I have rather than just adding to them and cluttering up my living room.
Its probably a moot point anyway as I doubt iTV will be launched in the UK for a long while anyway.
Im hoping Apple bring out a HDTV of there own, with iTV built in. Basically a 50" iMac :D Seriously though that would be cool and I would buy it straight away. Eventually i think thats where Apple will end up.
Sydde
Mar 15, 06:25 AM
I've largely given up on these threads and arguing about my field with people outside my field, but my god awmazz you need to just stop posting altogether...you haven't once had a clue what you are talking about. Sorry, but it's the truth.
All the fission stopped almost 72 hours ago.
Curious. You are suggesting that the control rods are fully seated (we would hope), absorbing the entire natural neutron flux, thus completely dampening the fission process (apart from the normal spontaneous fission of the 235 in the fuel pellets). Yet, the cores are still producing significant heat, sea water is being pumped over them to cool them, a real danger appears to exist. Where is that heat coming from, why, if the fission process has been choked off, are they not simply losing heat (cooling down like a big hunk of metal)? What are we missing?
All the fission stopped almost 72 hours ago.
Curious. You are suggesting that the control rods are fully seated (we would hope), absorbing the entire natural neutron flux, thus completely dampening the fission process (apart from the normal spontaneous fission of the 235 in the fuel pellets). Yet, the cores are still producing significant heat, sea water is being pumped over them to cool them, a real danger appears to exist. Where is that heat coming from, why, if the fission process has been choked off, are they not simply losing heat (cooling down like a big hunk of metal)? What are we missing?
more...
bradl
Mar 18, 02:01 AM
Wow... was multi-tasking supported that early, or did we not get that until 4.0. It's early here in Florida and I can't remember.
But hey, if its working for you... go with it!
No. it wasn't.
I rarely use it, and when I do, it is work related. I went the MyWi route after the BenM hole was patched up in iOS > 3.1.
BL.
But hey, if its working for you... go with it!
No. it wasn't.
I rarely use it, and when I do, it is work related. I went the MyWi route after the BenM hole was patched up in iOS > 3.1.
BL.
more...
blastvurt
Apr 10, 01:10 PM
This is Apple of and this is the iPad and iOS.
Entirely, entirely different ballgame from any other handheld on the market.
Your right, it is a entirely different ballgame, other handhelds are dedicated for gaming, the ipad and iphone is not.
As far as the limits of touch-based gaming goes . . . come back in 2-3 years and *then* keep telling me about limits.
There are limits to touch based gaming and always will be
The same way the Xbox 360 controller is more limited than the PS3 controller with 6 axis
The same way the Wii controller is limited at with many types of games compared to the Xbox 360 and PS3 conventional button based controllers
Interesting how Apple is turning non-gamers in to gamers, and we're not hearing about the alleged horrid limits of touch-based gaming.
Sort of like what Nintendo did with the Wii. With its excellent libary of good games, oh wait it has a few good games and a large amount of shovelware. Compare that to something like the PS3 or XBOX 360, a lot of good games and some shovelware
Yes, and touchscreens on smartphones will *never* replace physical keyboards. We all know how that turned out, right?
Yes we have, they haven't replaced physical keyboards. They may have become more popular than keyboard based devices, but keyboard based phones are still released.
Fear of change? It's thick in these forums.
There is good change, bad change and what many people want on here change for the sake of change
In January 2010 people looked at the iPad and didn't quite understand what was going on. Didn't know where to put it, what category to fit it into. To some it was amusing at best. To others it was ridiculous and redundant. To a few it was total genius.
Considering tablets had been around for many years before the ipad but never really made it into the consumer realm. It is understandable why many would assume it a failure.
Many people on here are more tech minded, something like the ipad would not look like a successful product due to its limited capabilities, compared to what they want from a device
Today it's a household name and a device millions upon millions of people have and use every day - many of them just average, non tech-savvy folks. And it's the device that drives the post-PC era. And demand by both consumers and developers and content providers is exploding, and will continue unabated for the foreseeable future.
Ipad is for general consumers, the same way the netbook was. Good for consumption of the web, ebooks etc (better than the netbook for ebooks and reading due to form factor). Limited uses for real work though.
PSP Slim? DS? LOL is all I have to say. Like the Palm Centro and Cli� before the iPhone. These aren't even a factor anymore.
Your right they are not factors anymore. It is now 3DS, PSP NGP, HP veer and Pre 3.
Today iphone tomorrow something else. There is nothing stopping Apple from failing. It is sheer blind stupidity to think they can't fail and that they will always be successful.
Entirely, entirely different ballgame from any other handheld on the market.
Your right, it is a entirely different ballgame, other handhelds are dedicated for gaming, the ipad and iphone is not.
As far as the limits of touch-based gaming goes . . . come back in 2-3 years and *then* keep telling me about limits.
There are limits to touch based gaming and always will be
The same way the Xbox 360 controller is more limited than the PS3 controller with 6 axis
The same way the Wii controller is limited at with many types of games compared to the Xbox 360 and PS3 conventional button based controllers
Interesting how Apple is turning non-gamers in to gamers, and we're not hearing about the alleged horrid limits of touch-based gaming.
Sort of like what Nintendo did with the Wii. With its excellent libary of good games, oh wait it has a few good games and a large amount of shovelware. Compare that to something like the PS3 or XBOX 360, a lot of good games and some shovelware
Yes, and touchscreens on smartphones will *never* replace physical keyboards. We all know how that turned out, right?
Yes we have, they haven't replaced physical keyboards. They may have become more popular than keyboard based devices, but keyboard based phones are still released.
Fear of change? It's thick in these forums.
There is good change, bad change and what many people want on here change for the sake of change
In January 2010 people looked at the iPad and didn't quite understand what was going on. Didn't know where to put it, what category to fit it into. To some it was amusing at best. To others it was ridiculous and redundant. To a few it was total genius.
Considering tablets had been around for many years before the ipad but never really made it into the consumer realm. It is understandable why many would assume it a failure.
Many people on here are more tech minded, something like the ipad would not look like a successful product due to its limited capabilities, compared to what they want from a device
Today it's a household name and a device millions upon millions of people have and use every day - many of them just average, non tech-savvy folks. And it's the device that drives the post-PC era. And demand by both consumers and developers and content providers is exploding, and will continue unabated for the foreseeable future.
Ipad is for general consumers, the same way the netbook was. Good for consumption of the web, ebooks etc (better than the netbook for ebooks and reading due to form factor). Limited uses for real work though.
PSP Slim? DS? LOL is all I have to say. Like the Palm Centro and Cli� before the iPhone. These aren't even a factor anymore.
Your right they are not factors anymore. It is now 3DS, PSP NGP, HP veer and Pre 3.
Today iphone tomorrow something else. There is nothing stopping Apple from failing. It is sheer blind stupidity to think they can't fail and that they will always be successful.
jmcrutch
Mar 18, 08:51 AM
If AT&T were to allow tethering with unlimited, they know that ASAP people would start dropping their home internet en masse. Not saying everyone would, but plenty would for the same reason they dropped their home landline telephone. Will this happen eventualy anyway - yes. But AT&T, as the provider has the right to do as they see fit for their business and their shareholders.
While you might not use more data via tethering, if it were allowed with no extra charges, and on unlimited plans, AT&T would see a huge spike in usage that would not go down - and they would be doing so without any increase in their revenues (in fact, they'd see a decrease as noted above).
While you might not use more data via tethering, if it were allowed with no extra charges, and on unlimited plans, AT&T would see a huge spike in usage that would not go down - and they would be doing so without any increase in their revenues (in fact, they'd see a decrease as noted above).
more...
Peterkro
Mar 14, 12:01 PM
And gravity has yet to go up. :p LOL
While the idea is ridiculous Lewis Carroll (who was a mathematician amongst other things:rolleyes:) did some work on the problem and in a fictional work came up with this:
"In Chapter 7 of Lewis Carroll's 1893 book Sylvie and Bruno. The fictional German professor, Mein Herr, proposes a way to run trains by gravity alone. Dig a straight tunnel between any two points on Earth (it need not go through the Earth's center), and run a rail track through it. With frictionless tracks the energy gained by the train in the first half of the journey is equal to that required in the second half. And also, in the absence of air resistance and friction, the time of the journey is about 42 minutes (84 for a round trip) for any such tunnel, no matter what the tunnel's length."
f
While the idea is ridiculous Lewis Carroll (who was a mathematician amongst other things:rolleyes:) did some work on the problem and in a fictional work came up with this:
"In Chapter 7 of Lewis Carroll's 1893 book Sylvie and Bruno. The fictional German professor, Mein Herr, proposes a way to run trains by gravity alone. Dig a straight tunnel between any two points on Earth (it need not go through the Earth's center), and run a rail track through it. With frictionless tracks the energy gained by the train in the first half of the journey is equal to that required in the second half. And also, in the absence of air resistance and friction, the time of the journey is about 42 minutes (84 for a round trip) for any such tunnel, no matter what the tunnel's length."
f
more...