Wilki Amieva wrote: That is correct if you assume a constant speed and an instantaneous acceleration. I suppose you used Lorentz transformations.
....OR we could just assume an average speed. :/
Saif
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Fireplace
Holly2003 wrote:
You can't know that unless you know his itinerary: for example, maybe he stopped for a while to watch attack ships on fire off the shoulder of Orion? Or to see C-beams glitter in the dark near the Tannhauser gate? Too many variables...
Or did he perhaps stop off at some corner of Alpha Centauri to pick up his copy of The Cosmos Rocks?
You can't know that unless you know his itinerary: for example, maybe he stopped for a while to watch attack ships on fire off the shoulder of Orion? Or to see C-beams glitter in the dark near the Tannhauser gate? Too many variables...
Or did he perhaps stop off at some corner of Alpha Centauri to pick up his copy of The Cosmos Rocks?
magicmatze
Time delation from the special relativity theory works at all speeds. But best speed would be a speed which is very close to the speed of light. The faster you are, the more time you're "travelling into the future".
Most important matter is, that speed has to be constant (acceleration=0).
If you want to know more read the wiki-article about the "Twin-Paradox" or similiar articles on the net.
http://en.wikipedia.org/wiki/Twin_paradox
By the way, this is also a problem in GPS-navigation, with a satellite-speed of 4000 m/s, but this has just a very small inflence.
Most important matter is, that speed has to be constant (acceleration=0).
If you want to know more read the wiki-article about the "Twin-Paradox" or similiar articles on the net.
http://en.wikipedia.org/wiki/Twin_paradox
By the way, this is also a problem in GPS-navigation, with a satellite-speed of 4000 m/s, but this has just a very small inflence.
Saif
magicmatze wrote: Time delation from the special relativity theory works at all speeds. But best speed would be a speed which is very close to the speed of light. The faster you are, the more time you're "travelling into the future".
Most important matter is, that speed has to be constant (acceleration=0).
Yeah, there would be no need for further acceleration once it reached the requisite speed(inertia of motion). But I think Wilki mentioned instantaneous acceleration in order to account for any curvilinear direction changes because instantaneous acceleration is present even when there is no change of magnitude(vector algebra). We can minimize it by assuming the only direction change is while reversing the space ship's path(to return to Earth).
Most important matter is, that speed has to be constant (acceleration=0).
Yeah, there would be no need for further acceleration once it reached the requisite speed(inertia of motion). But I think Wilki mentioned instantaneous acceleration in order to account for any curvilinear direction changes because instantaneous acceleration is present even when there is no change of magnitude(vector algebra). We can minimize it by assuming the only direction change is while reversing the space ship's path(to return to Earth).
Wilki Amieva
Exactly.
Wilki Amieva
I have just found what I have written roughly five years as an answer to "How exactly is '39 about time travel?" posted in this very forum: http://queenzone.com/queenzone/forumnew/forum_topic_view.aspx?Q=615254 - long deleted now.
"Well, it has to do with the Time Dilation phenomenon as explained by Einstein's Theories of Relativity.
Let's say that you board a spaceship and accelerate to a very high speed in relation to a resting frame. If you do so, an observer in the resting frame will notice that your time will run slower than his/her own time. This time dilation is not an artifact that will only affect the moving clocks (or any other time-measuring devices) - in fact, it will affect ALL physical processes, including biological, so it will effectively delay aging ('For so many years have gone though I'm older but a year').
The most common way to calculate the time as measured in the moving clock from the one measured in the resting frame and vice-versa is to apply the so called Lorentz Transformations: http://www.bartleby.com/173/11.html
This is a simple set of ecuations (believe me - there are complex generalizations of those, such as the Poincaré Transformations) in which you input the measured time interval and also the relative speed.
If we believe that the volunteers returned one hundred years later ('In the year of '39 assembled here the volunteers' and 'In the year of '39 came a ship in from the blue', but 'In the land that our grandchildren knew' and 'Your mother's eyes from your eyes cry to me') then we can only calculate the equivalent speed of the volunteers' spaceship (unfortunately, the song does not give us any information about its acceleration), which is roughly 99,995% of the speed of light!!!
So, we can conclude that the spaceship's captain is either Captain Kirk or Mr. Fahrenheit!"
"Well, it has to do with the Time Dilation phenomenon as explained by Einstein's Theories of Relativity.
Let's say that you board a spaceship and accelerate to a very high speed in relation to a resting frame. If you do so, an observer in the resting frame will notice that your time will run slower than his/her own time. This time dilation is not an artifact that will only affect the moving clocks (or any other time-measuring devices) - in fact, it will affect ALL physical processes, including biological, so it will effectively delay aging ('For so many years have gone though I'm older but a year').
The most common way to calculate the time as measured in the moving clock from the one measured in the resting frame and vice-versa is to apply the so called Lorentz Transformations: http://www.bartleby.com/173/11.html
This is a simple set of ecuations (believe me - there are complex generalizations of those, such as the Poincaré Transformations) in which you input the measured time interval and also the relative speed.
If we believe that the volunteers returned one hundred years later ('In the year of '39 assembled here the volunteers' and 'In the year of '39 came a ship in from the blue', but 'In the land that our grandchildren knew' and 'Your mother's eyes from your eyes cry to me') then we can only calculate the equivalent speed of the volunteers' spaceship (unfortunately, the song does not give us any information about its acceleration), which is roughly 99,995% of the speed of light!!!
So, we can conclude that the spaceship's captain is either Captain Kirk or Mr. Fahrenheit!"
Holly2003
The only danger is if they send us to that terrible Planet of the Apes. Wait a minute... Statue of Liberty... that was our planet! You maniacs! You blew it up! Damn you! Damn you all to Hell!
ParisNair
[QUOTE]
Saif wrote:
ParisNair should be able to do this effortlessly. :D
[/QUOTE]
LOL! Not at all man. 10 years ago, I might have tried...but now I am absolutely clueless. I am an engineer by education, and physics and maths were my fav subjects in school. But I know less with every passing year. And I am more interested in arts and history now.
[QUOTE]
Saif wrote:
I've made a big career mistake.
[/QUOTE]
I was thinking this too :-) Is your knowledge of medicine as good as your physics?
Saif wrote:
ParisNair should be able to do this effortlessly. :D
[/QUOTE]
LOL! Not at all man. 10 years ago, I might have tried...but now I am absolutely clueless. I am an engineer by education, and physics and maths were my fav subjects in school. But I know less with every passing year. And I am more interested in arts and history now.
[QUOTE]
Saif wrote:
I've made a big career mistake.
[/QUOTE]
I was thinking this too :-) Is your knowledge of medicine as good as your physics?
GratefulFan
ParisNair wrote:
LOL! Not at all man. 10 years ago, I might have tried...but now I am absolutely clueless. I am an engineer by education, and physics and maths were my fav subjects in school. But I know less with every passing year. And I am more interested in arts and history now.
=====================================
It's funny how that works isn't it. I could not wait to hurry up and finish my one compulsory and completely tedious grade 9 history credit so I could get on with the hard sciences for the rest of my education and career. But my pleasure reading has flipped and is almost exclusively related to political and cultural history and the soft, social sciences. I now really, really kick myself for ignoring that part of my formal education because sometimes I feel like I'm flapping around and flying blind in my continuing learning. I know there must be wonderful, foundational, definitive books in these areas that I know absolutely nothing about.
LOL! Not at all man. 10 years ago, I might have tried...but now I am absolutely clueless. I am an engineer by education, and physics and maths were my fav subjects in school. But I know less with every passing year. And I am more interested in arts and history now.
=====================================
It's funny how that works isn't it. I could not wait to hurry up and finish my one compulsory and completely tedious grade 9 history credit so I could get on with the hard sciences for the rest of my education and career. But my pleasure reading has flipped and is almost exclusively related to political and cultural history and the soft, social sciences. I now really, really kick myself for ignoring that part of my formal education because sometimes I feel like I'm flapping around and flying blind in my continuing learning. I know there must be wonderful, foundational, definitive books in these areas that I know absolutely nothing about.
Saif
ParisNair wrote:
Saif wrote:
ParisNair should be able to do this effortlessly. :D
LOL! Not at all man. 10 years ago, I might have tried...but now I am absolutely clueless. I am an engineer by education, and physics and maths were my fav subjects in school. But I know less with every passing year. And I am more interested in arts and history now.
Saif wrote:
I've made a big career mistake.
I was thinking this too :-) Is your knowledge of medicine as good as your physics?
Well, it obviously is(my medicine knowledge). It was a grueling 5.5 years("officialy" four). We had daily exams in the Medical College. The goddamn item exams. And we had some horrible professors. Now I'm an intern at a local clinic and will probably have to continue for a year. It pays like crap. Even auto-rickshawallas earn more than us. That's why many of my friends are teaching at those medical/engineering coaching centres. Heard they pay like Rs. 1000/lecture in the biggest ones. I've been forced to tutor a few of my Grade 11-12 cousins so I had to catch up with my Physics/Chemistry/Math.
Saif wrote:
ParisNair should be able to do this effortlessly. :D
LOL! Not at all man. 10 years ago, I might have tried...but now I am absolutely clueless. I am an engineer by education, and physics and maths were my fav subjects in school. But I know less with every passing year. And I am more interested in arts and history now.
Saif wrote:
I've made a big career mistake.
I was thinking this too :-) Is your knowledge of medicine as good as your physics?
Well, it obviously is(my medicine knowledge). It was a grueling 5.5 years("officialy" four). We had daily exams in the Medical College. The goddamn item exams. And we had some horrible professors. Now I'm an intern at a local clinic and will probably have to continue for a year. It pays like crap. Even auto-rickshawallas earn more than us. That's why many of my friends are teaching at those medical/engineering coaching centres. Heard they pay like Rs. 1000/lecture in the biggest ones. I've been forced to tutor a few of my Grade 11-12 cousins so I had to catch up with my Physics/Chemistry/Math.
Micrówave
The answer is 42.
Saif
All right then, find the equation whose only roots are 42 and the magnitude of lightspeed. :P