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. F

    Light doesn't travel through time?

    According to the special theory of relativity: The combined speed of any object’s motion through space and its motion through time is always precisely equal to the speed of light. But light travels through space precisely at the speed of light. Doesn't that imply that light doesn't travel...
  2. A

    Something I don't understand about FTL travel

    Okay first of all, I know it's impossible to travel faster than light. But they say that IF... IF you could, then you would arrive at your destination before you left. That's what I don't understand. Like for example, it takes light 8 minutes to get to us from the Sun. So if a person...
  3. C

    Earth Travel Speed: 800 km/s in Universe?

    If Earth is moving with the speed of 800 km/s in universe, then do we travel at 1/375 of the speed of light according to a hypothetical static point in universe?
  4. P

    Zero impact vehicle that needs to travel 9 through 12 m

    Homework Statement the vehicle needs to stop as close to a wall that is located anywhere from 9 to 12 m away. (The distance is not given exactly) The vehicle must be self propelled and has other specifications located here...
  5. dbmorpher

    Can Black Holes Be Used for Faster-Than-Light Travel?

    Hello dbmorpher here, I am an avid Halo fan, and in the lore the ability to go faster than light is from the http://halo.wikia.com/wiki/Shaw-Fujikawa_Translight_Engine I wanted to know if miniature black holes and hawking radiation would be able to rip a hole in space-time. If not what are...
  6. A

    Question involving space travel and the expansion of the universe

    From what I understand, the expansion of the universe means that sub-lightspeed travel is sort of like running on a treadmill and eventually the expansion wins out and you'll never get anywhere. So, my question is, Take a point in the universe, and imagine a sphere expanding from that...
  7. S

    Speed of light, and path of travel, in distorted time-space

    How is the speed of light, and path of travel, effected in time-space distorted (by say, gravity)? We know that the sun/earth's gravity distorts time-space. So when a photon travels from sun to earth...as it nears the earth... how much length would the photon travel? Would it be slightly...
  8. M

    Exploring Time Dilation in Space Travel

    Ok, so I just watched the nova fabric of the cosmos (blew my mind). Anyways, suppose I jumped on top of a beam of light and road it as it traveled out into space. Now, suppose that as I was traveling out there, another person is coming at me in the exact opposite direction on another beam of...
  9. A

    Confusion abt relation betwn time travel and speed of light

    i don't know in which section it belongs, so i am putting it here... according to various theories proposed by various researchers, time travel depends on the speed of light. as far as i have read/heard - i) anything traveling faster than the speed of light moves back in time. ii) anything...
  10. S

    How to understand why massless particles must travel at c?

    First of all, i need to say that i have read various threads posted by other users in physicsforum who have asked the same question. However, I still don't have a clear picture of why massless particles must travel at c. Personally, I have came up with an explanation which is rather simple...
  11. S

    Calculating Light Travel Time for 60 cm

    Homework Statement if the velocity of light in the medium is assumed to be 2.10^-8 m/s, how much time does it take the light to travel through the distance of 60 cm? Homework Equations n/a The Attempt at a Solution i tried to do something but not enough.. :(
  12. M

    Time and space travel at light speed

    Apologies if this is a really stupid question but I've never seen it satisfactorily explained although that is perhaps because it is a really stupid question! Bill stays on earth, Ted flies off into space traveling randomly at or very near the speed of light. He's back after a few days and...
  13. J

    Faster than light information travel

    Faster than light information travel aparatus Ok, so I am not a physics pro, but I find it very interesting. And I just finished reading about Bell's theorem and I have a question. As I understand it, the laws are like this for entangled photons: 1. If you measure the polarization of photon 1...
  14. J

    If EM waves travel forever, why do things get dimmer as they get further away?

    Other than nearby light pollution. Or is that the only reason?
  15. N

    Time for a ball on string to travel around a pole.

    Homework Statement A tetherball with a string length of 1.5m is hit in such a way that it completes a circle around the pole with the string at 30 degrees from the pole. Assuming it doesn’t lose a significant length during the trip around the pole and hence takes a perfectly circular orbit...
  16. E

    How far does the object travel horizontally? Two-Dimensional Motion

    Homework Statement A rifle bullet is fired from the top of a cliff at an angle of 30° below the horizontal. The initial velocity of the bullet is 800 m/s. If the cliff is 80 m, high, how far does it travel horizontally? θ = 30° v0 = 800 m/s y = 80 m Homework Equations I may be...
  17. M

    Is space truly empty or is it filled with unseen forces and fields?

    hi is there any proof that light does actually travel?
  18. spacecadet11

    S"Exploring Slow Space Travel: Overcoming the Speed Barrier in Vacuum Flight"

    Hello. Thanks for previous responses. I asked a question about developing a vehicle that 'flies' in a vacumn instead of a rocket. Apparently the issue with space travel is the required speed. Not distance traveled per se above the Earth's surface or the fact that the vehicle has to travel thru a...
  19. B

    Does Electromagnetic radiation travel faster than the speed of light?

    Please feel free to move this to the correct forum. After doing some reading, I've found that Electromagnetic radiation travels at the speed of light in a vacuum. EMR also travels in the path of a wave. Whereas, light and/or light photons travel in the path of a straight line. Having said...
  20. X

    FTL Travel - Are we in trouble when the oil runs out?

    Is there a race against time to discover FTL travel? Hey guys. I would like to ask your opinion on a possible crisis for humanity. If humans havn't discovered practical FTL space travel before oil becomes scarce... could we be in trouble? When oil runs out, lots of things will change. Could it...
  21. M

    Time Travel and the space-time continuum

    If someone were able to travel back in time and change an event in history which resulted in a divergent timeline from the one you came from would both timelines be part of the same space-time continuum? I suspected they could be because part of their timelines are shared and connected to...
  22. R

    Record travel along a straight path

    Homework Statement A record of travel along a straight path is as follows: 1. Start from rest with constant acceleration of 2.20 m/s2 for 15.0 s. 2. Maintain a constant velocity for the next 1.65 min. 3. Apply a constant negative acceleration of −9.92 m/s2 for 3.33 s. (a) What was the...
  23. T

    Is Warp Drive a Possibility or Just Science Fiction?

    I chanced upon this article in the Huffington Post and would like to ask if anyone is familiar with this work? Is this even feasible? http://www.huffingtonpost.com/2012/09/17/warp-drive-star-trek-feasible_n_1890679.html
  24. C

    Relativity 101: Near speed of light travel

    I thought I read that if you were in a ship near the speed of light, all the stars would appear to be in front of you. The closer to c you are, the more everything will be collapsed to a cone facing forward. Is that right? Thinking about it a little from the non-moving frame, it seems like...
  25. B

    Question about a monte carlo simulation of car travel patterns

    Hi there, I have a question about probability, conditional expectations, copula functions and their use in a Monte carlo simulation. I'd appreciate any help or comments that you can offer. I'll describe briefly what I am trying to simulate and I'll ask the specific question at the end...
  26. H

    Geometry to work out how fast a bullet would have to travel to

    Hi guys, i was wondering how you calculate how fast a bullet would have to travel to 'overcome' gravity, i.e if it didn't hit anything (and discluding air resistance for now). Mapping the Earth as a circle and knowing things such as the radius of the Earth and gravity acts on the bullet at...
  27. P

    Why does low frequency light appear to travel faster than high frequency light?

    I understand that new findings from the 'magic' telescope, suggest that higher frequency light arrives earlier than low frequency light. The results have been taken from a light source that is very far away. apparently this shows that spacetime is not uniform and that higher frequency light...
  28. B

    Travel patterns distributions of a sample representative of a population?

    Travel patterns distributions of a sample representative of a population?? Hi, I was hoping that somebody might be in a position to advise me on a problem that I have. I am recording the travel patterns of a car for 80 different families for 2 years. Specifically I am recording the...
  29. N

    Faster Than Light Travel, Theories.

    Any one who has been following my other Thread (Simulated Gravity) knows that I've trying to write a Hard(ish) Science Fiction novel. I'm looking for help in firming up my "FTL Drives" and trying to use current Real world knowledge Currently there is two ways to "cheat" the speed of light...
  30. J

    SciFi writer needs space travel help

    My novel is coming together rather rapidly, but I've left some pretty big holes in my descriptions of the setting. It takes place on a generational ship traveling from Earth to a New hypothetically hospitable planet. Essentially I would like to know the amount of time that has passed on both...
  31. 9

    Can light travel faster than the speed of 300,000,000m/s?

    Hello, I am just curious about this physics question. I understand the light can travel 300,000,000 m/s in vacuum but if air, water, or something else would interact with it light will move slower. Here are some questions Using the example when a boat is moving 40 m/s and a ball is shot...
  32. D

    Why does current travel at speed of light rather than speed of sound?

    Here's how I understand the situation: when an electrical current is running through a wire, the individual electrons are moving very slowly. The reason that a light bulb turns on so quickly after the switch is closed, then, is because as the electrons near the switch start moving, they push on...
  33. C

    Time machine/time travel device construction ideas

    Anyone have any ideas how I can make one? Please discuss below!:biggrin: The only thing I know so far is that to time travel you have to go faster than the speed of light...
  34. S

    Turn off the Higg's field and travel at the speed of light?

    Hi all ! Firstly, I am a computer science student, and I have very very very little idea about what I am talking about. That's why I am here. I don't understand what Higg's boson is, but after the recent confirmation, I watched a huge number of videos on the internet to get an intuitive...
  35. S

    Is the Travel Time to Reach the Speed of Light Really Only 2 Years?

    http://scienceblogs.com/startswithabang/2011/06/01/striving-for-the-speed-of-ligh/ In this article, the author claims that it would take a little over 1.25 years to reach 90% the speed of light if we accelerate at 1g. However, if I let F=dp/dt, where p=γmv, and then integrate F with...
  36. L

    What are the three situations in which light does not travel in a straight line?

    what are the three situations in which light does not travel in a straight line? I know two situations; Superposition and Spectrum. What is the last situation?? Is that Wavelength?
  37. Artlav

    Why light does not travel in wires?

    Asking in most general shape, why do signals from upper Ghz and above don't seem to travel in wires? Radio frequency waves can propagate in wires - you can have a signal like that being induced from the wave interacting with the wire, being generated, measured directly, and so on. But...
  38. S

    If you could travel faster than light

    Supposing that you could travel faster than the speed of light, what would you see, feel, or experience? Since an object travels slower in time as it approaches light speed, wouldn't the object, if it did travel faster than light, enter into a complete and absolute void because nothing else in...
  39. R

    Creating Artificial Gravity for Spacecraft Travel

    I wrote a brief technical paper on the research and concepts for creating artificial gravity in space using centrifuges for my Mechanical Engineering class. I would just like to share it with the Physics world...
  40. D

    Time Travel Paradox Involving Couples

    Has Anyone ever thought of this time travel paradox before? That a couple or more (some men and some women ok) went back in time via a Time Machine and started, i.e. seeded the Human race? That is the Human Race is a Perpetual Loop? What would this be called?? A feedback loop?
  41. D

    Is Our Current Existence Already Predestined by Time Travel?

    I have had this question and nobody can answer it, so I decided to REGISTER here. If time travel was possible, would a person living in the year 3000, time traveled back to year 1000 AD. Does that mean that life has already been played out? Meaning people living in the year 1000, feel as...
  42. R

    Exploring Physical Theories of Interdimensional Travel

    I'm wondering if their are any unified physical theories that predict our universe to be a part of a multiverse in our own dimension? I'm looking for anything along the lines of stating that our universe is a star in a 'galaxy' of other universes that we can theoretically travel to if we could...
  43. W

    (Find time it takes a block to travel) Dynamics

    Homework Statement How long would it take for the block to travel 10m starting from zero velocity? (i.e. T =?) (Look the the attached picture for the block and the position of it on the plane at 45 degree and 10 m from ground with the same slope) Theta = 45 degrees m = 1.0 kg f = 0.3...
  44. F

    Will The Theory of Relativity allow me to travel Backwards in Time?

    Hello, I have been wondering about this for a bit of time now, but forgive me for not being entirely clear with this, if that does happen. I once heard that the relativity of space and time is like a graph. If you are not moving in space, that does not affect your time, with space being on...
  45. P

    Exploring Backwards Time Travel with My 16 Y/O Son

    Hi - Physics is not something I studied in school and to be fair to myself, not doing so saved me from failing the class... Over the years, my 16 y/o son and I have watched Nova and we do some light reading on Quarks, String Theory etc. My son seems to understand things that I do not and from...
  46. C

    Distance of travel in circular motion?

    I'm trying to figure out the distance traveled in a circular motion. This is for a traffic court case, I need to figure out how far my car traveled in an intersection. So far, I've only been able to find equations for determining speed. I have speed. I have time. I also have the radius of the...
  47. T

    Future Space Travel referring to Electromagnetic Induction

    Homework Statement I have a question for homework which is. "Chemical rockets are unsuitable for travel beyond close planets. Describe a method of propulsion based on electromagnetic induction which could be used for long distance space travel beyond the nearest planets." Homework Equations...
  48. V

    Engineering Do Chemical Engineers get to travel the world?

    Do Chemical Engineers get to travel the world? Hi, just wondering if chemical engineers get to travel the world for their job? Like if you think of civil engineers, their companies will regularly contract them to do projects overseas, similar to mech and elec engineers, but for chemical...
  49. S

    Can Exceeding the Speed of Light Really Mean Time Travel?

    Your opinion on"exceeding the speed of light means the ability to return to the past" I personally think this assertion is absurd, so I'm wondering why so many people(including physicists) think this is true.
  50. D

    Does SR actually forbid FTL travel?

    Does SR actually imply that FTL travel would allow for violations of causality? Here is some reasoning to suggest that it does not: (I would be surprised if there were no holes in the reasoning. My desire to find these holes is what motivated me to post this here.) Consider the following...
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