Travel Definition and 995 Threads

Travel is the movement of people between distant geographical locations. Travel can be done by foot, bicycle, automobile, train, boat, bus, airplane, ship or other means, with or without luggage, and can be one way or round trip. Travel can also include relatively short stays between successive movements, as in the case of tourism.

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  1. B

    Please set me straight about velocity based time travel

    I just finished watching a hawkins program about time travel that theorized that the faster an object travels through space, the slower it moves through time. The example involved a trip to Alpha Centauri at 99.9% light speed. He claimed that although the trip would only take a few years to...
  2. S

    Time Travel and the Conservation of Matter Problem

    Imagine the following experiment: Scientists have made a machine that can create a traversable wormhole and can also accelerate one end at near the speed of light and bring it back. A time machine. Suppose the dilation between the two ends is 10 years. As soon as the experiment brings...
  3. M

    Time travel paradox only due to choice

    The title is the best way I could group this thought. And the following is most likely sloppy so I do apologize. I get the 'feeling' (subjective I know), that the measurement effecting the outcome i.e. only being able to measure position over velocity, collapsing wave functions, etc... comes...
  4. O

    Probability that a molecule will travel a distance at least equal to the mean free pa

    Homework Statement a) Find the probability that a molecule will travel a distance at least equal to the mean free path before its next collision. b)After what distance of travel since the last collision is the probability of having suffered the next collision equal to 1/2? Homework...
  5. B

    Is Time Travel Possible and How Does it Work?

    Hello. I've been on this forum for a while. Though I never really bothered clicking the "register" button until now. I am no scientist (In fact I still haven't reached university yet), so this might be a bit, well, simple-minded. Recently I've had some thoughts and discussions with my friends...
  6. J

    Physics Are there physicists that study time travel

    I wonder if there is a profession in physics where physicists study time travel. If not, are there any research fields that correlate towards the study of time travel. I'm just curious.
  7. C

    Opposing forces but opposite travel = no work?

    Hi, This is something I was wondering about. Can two objects with opposing forces travel in opposite directions without any work(minus friction)? I made a drawing in pdf format to demonstrate what I'm trying to say. My understanding of physics is pretty elementary so I apologize if this is a...
  8. M

    What Are the Most Plausible Theories for Time Travel?

    Hi, I am currently working on a project over the summer, entitled 'The physics of time travel'. One of the first things I need is feedback from academics and students involved in physics. Are there any texts/books I should be reading? Also, it would be great if anyone has the time to fill in...
  9. J

    Does general relativity allow for faster than light travel?

    I understand special relativity enough to know that for anything traveling faster than light, there will exist a reference frame for which it is traveling back in time... However, I've heard claims that general relativity allows for the possibility of traveling faster than light by...
  10. T

    Nothing can travel faster than light

    Is that a completely correct statement? I had a discussion with a co-worker the other day (while checking out a customer at a local grocery store lol) about the statement above. I firmly made the argument that nothing can travel faster than light with the exception of inflation and...
  11. M

    What are some educational activities to do in San Diego?

    Hello~I’m an Atlanta newby to this forum, and am looking for help in planning an educational vacation for my husband and me. We’re both 60(+/-), and yearly we must attend a 4-day work related conference that’s held in different parts of the country. We always get a rental car and tack on a few...
  12. T

    Time taken to travel x meters with constant acceleration

    Hi, I'm trying to solve something that I'm very sure is simple, I just can't seem to find the right equation. A rocket is traveling straight up, with an acceleration of 20m/s^2. I need to know how long it takes to reach a height of 1379.8m (this is the second part of a question). I am...
  13. @

    Can Black Holes Break the Rules of Time?

    hey people..! I need to ask that whether time travel is possible ?.If speed of light is achieved..however besides this i also think that if speed of light is achieved nothing could stay at that speed virtually...what do you people think..?? Secondly, i was thinking that how do we know that...
  14. I

    How to get involved in time travel research?

    Time travel is always something that has deeply interested me... the theory of relativity and modern physics have shed more light on what time is but, even today, is 'time travel' actually a respectable field of research on its own? Thanks.
  15. A

    Distance travel given constant a

    A hot rod can accelerate from 0 to 60 km/h in 5.4 s. (a) What is its average acceleration, in m/s2, during this time? (b) How far will it travel during the 5.4 s, assuming its acceleration is constant? (c) How much time would it require to go a distance of 0.32 km if its acceleration...
  16. L

    How far can 'x' travel at a speed of 'y' assuming 'z' external influences

    I'm trying to determine how far a specific object can travel when ejected at a specific speed assuming specific external influences. Vague, I know, so here's the detailed question. http://en.wikipedia.org/wiki/Cnidocyte" for more information on measuring underwater psi). My question is, how...
  17. A

    Does air molecules travel with the same speed as the sound wave?

    Hi all, As sound travels through air, does the air molecules travel with the same speed as well? In other words, if sound is traveling in air at 340m/s, does it also then mean that the mean speed of all the affected air molecules is 340m/s? I personally do not think so. I guess that...
  18. A

    How Can Spacecraft Travel Faster Than Light?

    Lets just pretend we have a spaceship traveling in the vacuum of space with no friction from space dust whatsoever. It accelerates at a meager 10m/s. Eventually in millions of years it will near the speed of light. If nothing can go faster than the speed of light than what prevents said...
  19. M

    Why do waves(in general) travel in different frequencies?

    Why does a wave go up and down? What forces cause waves to go up and down? In order for a particle to be a specific frequency would depend on what?
  20. T

    How fast would a 163 Hz wave travel

    Homework Statement A 1575 Hz wave is passing through a medium and has a speed of 823 m/s. How fast would a 163 Hz wave travel through the same medium? Assume both waves are the same type and that the medium doesn't change in any significant way. Homework Equations...
  21. L

    Why doesn't infrared radiation travel through glass

    Lower frequency should have an easier time getting through glass than that of visible light. However remote controls for electronic devices to not work when glass is in the way. Then you go down even further into the spectrum to my wireless router and it has no problem going through glass...
  22. S

    Is blue shift a potential problem for near light speed travel?

    I've heard that future spaceships traveling at near the speed of light will have to deal with massive amounts of radiation due to interstellar gas. I think these spaceships might also have to deal with radiation from star light being blue shifted. How close to the speed of light would one have...
  23. L

    How far did the car travel in the fourth second?

    Homework Statement A car accelerates from 14 m/s to 26m/s in 4s. How far did the car travel in the fourth second? Homework Equations a=vf-vi/t = 26-14/4=3 d=vf^2-vi^2/2a=26^2-14^2/3=80 The answer is 24.5, but I keep getting 80 and I don't know why.
  24. N

    Noob question: If you travel as fast as light, time freezes so

    Noob question: Physicists say if you travel as fast as light, time is frozen/stops, if so, how come we can see light coming towards us, when in reality that light is supposedly "frozen" in time?
  25. EnumaElish

    Time travel and Asimov's Eternals

    Time travel and Asimov's "Eternals" I was reading Asimov's The End of Eternity over the weekend. The plot: Through time travel, the Eternals have been manipulating history so as to avoid tragic events (wars, etc.) that happened in the pre-manipulation version of history from having happened...
  26. L

    Travel time for a space ship at relativistic speeds

    Hi I'm writing a science fiction novel, and I'm trying to figure out how to make an approximation on the travel time of a hypothetical spaceship traveling at relativistic speeds. Given the following: The spaceship is capable of accelerating at a constant 1G, until it reaches a top speed of...
  27. B

    How long can a light ray travel

    I was wondering and have looked for a while on the internet to find out, in the end i found this site so i made an account. Can anyone tell me if light rays from stars fade out over time or if they travel for an infinite amount of time. Incase I am not clear enough, I am asking if light rays...
  28. Jonnyb42

    Is Time Travel the Key to Achieving Immortality?

    Please excuse the far-fetched nature of this thread. I only ask of your opinions. If you do not like these kinds of threads, then don't read it! In your opinion, would it be worth the effort to strive to build a time machine, so that you could go to the future where the medical field has...
  29. M

    Calculating the Direction of a Block's Travel from Multiple Forces

    Simple question: 20 kg block pushed from the east with 100 N, from the west with 20 N, and from south with 150 N. In what direction does the block travel. net x = 100-20 = 80 towards west net y = 150 towards north tan (x) = 150/80 x = 61.9 degrees For some reason, the book says...
  30. jaketodd

    What do Bosons travel through?

    Do Bosons travel just through each other, or through matter as well? Thanks, Jake
  31. Jonnyb42

    Is Instant Data Travel Possible Through Quantum Teleportation?

    Instant Data Travel?? Ok so I just read something and I am utterly confused... INSTANT data travel? It had to do with quantum entanglement and quantum teleportation. Is this stuff real?? I see the news on PhysOrg saying quantum teleportation of photon achieved at 16 km... THIS IS...
  32. F

    How to Set Up Algebraic Expressions for Car Travel Problems?

    Homework Statement Two cars start at the same time from the same place and travel along the same road. Car A has a constant speed of 50mph. Car B travels with the constant speed V for 100 miles, then stops to rest for a time, T, then travels again with constant speed V for another 100 miles...
  33. T

    What does electricity & magnetism travel through

    I understand that the electromagnetic field and light are tied together, and they all travel through big groups of photons and they all travel at the speed of light. And I get that light travels through empty space. But I am wondering what does electricity and magnetism travel through...
  34. A

    Time taken for wave to travel up rope.

    Homework Statement "Geologist A" at the bottom of a cave signals to his colleague "Geologist B" at the surface by pushing a 13kg box of samples from side to side. This causes a transverse wave to propagate up the 63.0m rope. The total mass of te rope is 12.0kg. Take g=9.8m/s2 How long does it...
  35. E

    Engineering Engineering Careers with Travel Opportunities

    Hey all, Firstly, I'm just finishing my second year of mechanical engineering. I've been thinking about my career options recently, and as I enjoy traveling, both domestically and internationally, I thought I'd try to gauge what type of opportunities there are for travel in engineering. I...
  36. S

    How long does a ray of light travel for based on ITS time scale

    Hi, Ive been readin about relativity, I am a little confused. The faster speed an object has, the faster time passes on the object. So how long does say a ray of light take to get from teh sun to the earth? It is ~8.5 of our minutes, but say I were on the ray of light; traveling with...
  37. J

    Do photons travel in straight lines?

    If a photon is detected at point B having been emitted at point A, can one deduce with near certainty that it must have traveled continuously in a straight line from A to B at velocity c?
  38. T

    Scenario allowing a signal to travel at superluminous speeds?

    Hi, new here. I'm a physics major undergraduate and just got through a class dealing with special relativity. I also learned about it a bit in high school. My question is regarding Einstein's second postulate that, paraphrased, grants that no particle can be accelerated to a speed greater...
  39. Jadaav

    Exploring the Possibilities of Time Travel: The Science and Theories Behind It

    is time travel possible? If yes, how is it possible to travel through time? Can we travel in the future? Can we travel back in the past?
  40. Z

    Time Dilation in Space Travel: Observations from Earth and the Spacecraft

    Hi there Can members please review my understanding of the problem. [b]1. The problem A star is 522 light years away from Earth. Imagine that the spacecraft was able to travel to the star at a speed pf 0.9999c a) How long does the trip take, as observed from Earth? b) How...
  41. I

    What determines distance a baseball will travel when hit?

    As you can see, this is my first post on the forum. I'll admit right now I'm here as an "asker" and not as an "answerer"... I realize my topic was vague, and I realize there are many factors including trajectory, pitch speed, bat material, wind, altitude, ball rotation, the bat's "sweet spot"...
  42. Q

    Warp Space Travel: Is the Light Always Ahead?

    ok last dumb question for tonight i promise... i have read that you can theoretically warp space (on paper not in a lab). let's say we built a warp drive however... if you were traveling through warped space say on the enterprise and shined a flashlight off the front of the ship would it still...
  43. J

    Tube Railing Travel: Can Small Gear Track Support 6' a Second?

    I am considering a tube railing system to transport a carriage. It will incorporate gear track/gear drive motion. I wish to support this on 1" to 1 1/2" steel tubing. the rate of travel will be 6' a second. Is this possible on such small deminsions. I have had experience on much larger...
  44. E

    Space Travel Videos: Find 10-20 min Video for Seminar

    Anyone know of a good 10-20 minute video on space travel? Anything that provides sufficient information on space crafts, progression of space travel, future space travel? Much appreciated, thanks. I need to show a video for my Space Travel seminar.
  45. V

    Highest point an object can travel?

    Can anyone (obviously someone can) tell me what the highest altitude an object in motion with no more potential energy to rise any further by itself can travel upward before it descends is called? I will appreciate your insight.
  46. M

    Can Time Travel Reveal Tasks Before Completion?

    About Me: I am not a physics student, but I do have a physics question. Question: The question is, assuming it is possible to travel into the future: could it be possible to learn whether a task performed in the future had occurred before it had been performed? Theory: You are capable of...
  47. jtbell

    For travel or train buffs with a lot of time on their hands

    http://www.google.ru/intl/ru/landing/transsib/en.html Videos of the entire Trans-Siberian Railway, shot out of train windows. Each video has its own YouTube page, which you can get to by clicking the link at the top left of the embedded videos, here or on the map page. There are hours and...
  48. P

    Why do massless objects travel at c?

    Why do photons, gluons, and all massless particles move at c? and will this fail if the Equivalence principle is disproved?
  49. I

    Using Black Holes for FTL travel

    So... my first post, and bear in mind, all I know of Black Holes is what I've read of Black Hole and Penrose Effect articles on Wikipedia. (don't hate me) Would it be possible to use Black holes' Ergosphere for FTL travel? And this is all on the "if" that we, or some other race, achieved...
  50. J

    The total travel time along a frictionless path?

    Hi, I have this problem about an object moving along a track due to a uniform gravitational field. It moves from being at rest in the higher position A (xA,yA) to the lower position B (xB,yB). There is no friction at all. What I am supposed to be doing is showing that the total time from A to B...
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