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. J

    Time taken for free falling objects to travel a set distance

    The time taken for a free-falling object to fall a set distance (on earth) is, according to Wikipedia, described by the equation: t = √(2d/g). Why is the distance doubled in this equation/ how is this derived?
  2. pinochet

    Will this travel faster than light

    if i throw a ball of matter forward in space will it travel faster than light given enough time and space with nothing what so ever to stop it i.e Newtons first law of motion in effect.i figured it should becuase it will have a force to give it a constant acceleration(change in velocity).my...
  3. KenJackson

    B Connected events at opposite ends of a photon's travel

    Someone started a recent thread with a statement that included "light exists outside of time". That excerpt was flatly rejected, and the post generated such a lively response that it was closed, having "wandered off into philosophy". It made me wonder if "light exists outside of time"...
  4. Cameron MacGillivray

    B Time travel with tachyons cause infinite dilemma?

    Hi. I am a 13 years old and interested in particle science. I was reading on tachyons and how you could hypothetically send them as signals back in time (not that I'm saying we will manage anytime soon or ever). It got me think about it and I realized something. I'm sure somebody has heard about...
  5. EnumaElish

    Aliens as FTL Humans: Scenario from Sci-Fi Novel

    What do you think of the following scenario*? Aliens are future humans who discovered faster than light travel. They propagated throughout the universe. In so doing they traveled back in time, to our time, or even earlier times. *I read this in a popular space opera novel. It may have been...
  6. victorhugo

    B Could information travel faster than C

    I've heard a few times that information can't travel faster than C, but what if you have an extremely dense metal rod that extends for 1 light year in length, the moment you move it here, wouldn't it instantaneously move at the other end 1 light year away? Or would the electrons that make it up...
  7. Tap Banister

    IF you could travel faster than light, would time cease or

    Greetings everyone, I asked my professor about this, recently. I had always heard that if you could gain the impossible amount of energy necessary to run beyond the speed of light, you would travel backwards in time. But he however, told me something that I have never heard before. He said...
  8. F

    I How can photons interact if they travel at the speed of ligh

    I was listening to a podcast about the solar neutrino problem, and they discussed how we have deduced that neutrinos are not massless due to the fact that they interact with other particles (even if this interaction occurs rarely). I paraphrase: "a particle traveling at the speed of light is...
  9. Zahidur

    Does light always travel at light speed?

    I've been told contradicting ideas about this. I've been told that light doesn't travel at a constant speed everywhere (i.e. light slowing down in speed after entering a more dense medium). However, I've also read that light speed is constant everywhere (i.e. if you could travel close to the...
  10. Dakota

    Time Travel to Future: Is There a Minimum Speed?

    Theoretically you can travel back in time by moving faster than the speed of light, or the universal speed limit. Is there a minimum speed? 0. But with gravity you would be moving, so if you move against gravity relative to yourself you are moving. So if there was a place in the universe free of...
  11. A

    How fast must you travel to get to Sirius in 15.5 years?

    Question: Sirius is about 9.50 ly from Earth. To reach the star by spaceship in 15.5 y (ship time), how fast must you travel? Answer in terms of "c". 0.4843c and 0.6129c are incorrect Relevant Equations and Constants: Attempt at solution: Can anyone help out I really don't know what...
  12. K

    How does light travel through semi-opaque surfaces?

    So i was wondering...if you have 2 surfaces of different areas..one bigger and one smaller...and the one with a smaller area disperses light through a lens..does more light travel through the one with the lens or the other or does the same amount of light travel through both? To get further...
  13. V

    How fast must the spacecraft travel? Special Relativity

    Homework Statement [/B] 1. Homework Statement A spacecraft is prepared to visit α-Centauri, which is at the distance 4.37 light years from the Sun. Provisions for the crew are prepared for the duration of 16 years. How fast must the spacecraft travel for this provision to be enough? Answer...
  14. David Mast

    Wheelchair lift concepts for Travel Trailer

    Hello all, i recently purchased a travel trailer, and i want to create a lift to get inside it. a little background on me, i was in a motocross accident, broke my back and am now paralyzed. I currently work at a full fabrication shop as a mechanical drafter, we have the capabilities to make...
  15. ytht100

    I Gradient of travel time in layered media?

    I have a problem of the following picture. x_0, y_0, z_0, V_0, and V_1 are fixed. http://postimg.org/image/6r0ogcx3f/ The travel time is obviously t = \frac{1}{{{V_1}}}{[{({x_1} - {x_c})^2} + D_1^2]^{1/2}} + \frac{1}{{{V_0}}}{[{({x_c} - {x_0})^2} + D_0^2]^{1/2}} According to a high-profile...
  16. memoryerasure1

    How does light interact, and travel through Solid matter as

    How does light interact, and travel through Solid matter as matter gets thicker, in width.?In the absorbion, and emission process of light, hitting electrons, I do not really understand that much, about electron energy levels, and how they change when a lot of atoms become molecules, and them...
  17. A

    How far does the block travel up the incline?

    Homework Statement In the figure, a block of mass m is moving along the horizontal frictionless surface with a speed of 5.70 m/s. If the slope is 11.0° and the coefficient of kinetic friction between the block and the incline is 0.260, how far does the block travel up the incline? Homework...
  18. B

    Debunking Interstellar Travel: Separating Fact from Fiction

    Hi Folks, What is your opinion on this article? It suggest that interstellar travel is a fantasy. http://www.scientificamerican.com/article/interstellar-travel-as-delusional-fantasy-excerpt/# Yet, I read articles about institutions like NASA investing in various conceptual propulsion...
  19. Ananay Wadehra

    Conditions of Big Bang & Light Speed Travel: Exploring Relativity

    According to Einsteins Theory of relativity if an object traveled at the speed of light, it's mass would become infinite, time would seem to stop relative to others and it length would become absolute zero. The same conditions were thought of at the Big Bang, when time didn't seem to have...
  20. S

    Time Travel Theory: Exploring Particle Entanglement

    So I was writing a short story and I came up with this scenario. Please pardon my Arrogance, but my theory uses several theories. I do have some sort of knowledge in Physics but here it goes. Could you, hypothetically transfer information in the form of gravitational waves between two entangled...
  21. Fraser MacDonald

    Faster than light travel in a vacuum chamber

    If an object is in a large vacuum chamber and is dropped, what is to stop it from accelerating to the point that it passes the speed of light, because there would be no air resistance to stop it from constantly accelerating?
  22. C

    Velocity of a muon if observed travel distance is 800 m?

    Homework Statement For a modern physics class, has to do with relativity In a lab experiment a muon is observed to travel 800 m before disintegrating. The mean lifetime of a muon is Tau = 2E-6 s A muon's travel distance at the speed of light is x = tc = 0.66 km Earth's atmosphere is x = 100 km...
  23. S

    Reverse relay and travel limit switch - PLC

    Homework Statement Hi, I'm currently studding a module on PLC and have a question on "what will happen if you do this ...". Homework Equations I don't have a problem with explaining operation of each rungs of the ladder diagram, I need some help on explaining the function of the reverse relay...
  24. S

    Reverse relay and travel limit switch - PLC

    Hi, I'm currently studding a module on PLC and have a question on "what will happen if you do this ...". As I don't have a problem with explaining operation of each rungs of the ladder diagram I need some help on explaining the function of the reverse relay and travel limit switches. Can anyone...
  25. Cobalt101

    Faster than light travel implications

    A couple of questions around faster than light travel. 1. I don't understand why this implies traveling back in time (as is sometimes suggested). For example : A tachyon traveling at 150% c travels between Point A and Point B and back again. While it will arrive at Point B before it is...
  26. Cobalt101

    Why Does Light Travel the Shortest Path?

    Why does light (or indeed any object) travel the shortest path between two points (whether for flat or curved space/space-time) ?
  27. J

    Choosing best path of travel that maximizes certain parameters....

    Hello All, I only have a vary basic understanding of physical concepts so please bear with me. I'm an object with mass greater than 0, a maximum speed, a maximum rate of acceleration and deceleration. Suppose I want to travel from point A to point B. The path is chosen for me and it leads...
  28. N

    Space Travel Physics: Realistic 2D Simulation

    So, I have been designing a game that uses Lego models to create spaceships that you then maneuver on a floor and do battle with. And one of the goals of this game is to be as realistic as possible, within the limits of a 2D environment. With that in mind, I have created a system that...
  29. T

    Where do cations travel to in a voltaic cell?

    Homework Statement A voltaic cell is set up and a chemical reaction proceeds spontaneously. Which of the following will not occur in this reaction? (A) The electrons will migrate through the wire. (B) The cations in the salt bridge will migrate to the anode half cell. (C) The cathode will...
  30. N

    I Why teleportation, time travel, virtual reality haven't happened yet?

    (I apologize beforehand if I'm asking such an 'amateur' question , I admit that I'm not a physics student / physicist nor scientist / science student ,.. but , as just a 'normal ordinary' person, at least I am very interested in these things ,. and how I deeply wish Humanity / Mankind can 'leap...
  31. A AM ARYA

    I How can Gluon travel at speed of light?

    How can Gluon travel at speed of light when it is bound inside a proton or neutron?
  32. D

    Why Infrared Light Can't Travel Easily Through Air

    Homework Statement "Infrared light doesn't travel through air easily". Why is that? Is it because there are lots of molecules that absorb the energy so that a reaction occurs? Homework EquationsThe Attempt at a Solution
  33. N

    What's happening in glass with the electrons, for light to travel through it?

    ... compared to a opaque materials electrons. Is it the amount of electrons in the atoms shells ?If you have a four inch cubic block of glass, and carbon, light passes through the glass no problem, but the carbon will absorb some red, yellow, green, and blue light, but if you look at the carbon...
  34. T

    Interstellar travel and Special Relativity

    I always ask myself this question, and I think it is better to ask people that really know about this. Due to the impossibilities that Special Relativity poses, such as any object with mass not being able to travel at the speed of light. If we don't manage to at least scratch that speed, I...
  35. H

    Drop In Passion During Critical Time

    Hello there, So I'm 23 years old, been passionately studying physics for some time now. Oh it's been fun and fascinating, I wouldn't trade it for anything. I could apply for my B.S. in physics any day now. I've always been great at physics. My conceptual understandings, my neat and unique...
  36. Anithadhruvbud

    How does light travel faster in optically rarer medium?

    Is it because that there are less molecules within one unit volume in rarer medium that light is able to travel through it easier?
  37. B

    Why can’t transverse waves travel through a gas or liquid?

    Homework Statement Why can’t transverse waves travel through a gas or liquid? Homework EquationsThe Attempt at a Solution I understand that transverse waves require rigid medium through which to transfer their energy so they can travel through solids. I'll just accept that transverse waves can...
  38. N

    Theoretical Time Travel: Explaining the Possibility

    I am writing a novel about time travel and don't quite understand the theoretical science behind it. If I understand correctly, Einstein's General Relativity theory opened up the door for the possibility of time travel even though he dismissed the idea as impractical. Einstein proved...
  39. ElijahRockers

    EM radiation appearing to travel faster than C

    I just had a flashback to an applied electromagnetic course I took a few years ago. I believe we were learning possibly about waveguides (maybe) or something, but there appeared a phenomenon in the math that made it appear as if the wave was traveling faster than C. When asked about it, the...
  40. K

    How many times will the line travel between A and B

    Hi, I'm new to the forum and have a maths question. So basically, X is the time axis (per minute) and Y is the price axis. I have a data set of 200,000 Y values in excel. If I were to draw two horizontal lines through the sine like wave, how many times will the line travel between A and B?? I...
  41. Saerryan89

    Time Travel: How Far & Fast to Reach Alien Neighbors?

    I was discussing with a friend about speed of light and time traveling and I realized something bizarre. I could be wrong so please correct my mistakes. So let's assume we want to go to our alien neighbour whose planet is 100 light years away. When we travel there with near light-speed, we...
  42. B

    How does air travel after leaving a nozzle?

    I am working on a project which involves air nozzles. I am interested in estimating the time it takes for air particles after they leave the nozzle to reach a particular distance away. I have the following information--- a converging nozzle, the speed with which it is coming out of the nozzle(I...
  43. writer

    I Time dilation time travel for novel - I need a calculation

    Hi! I've written a novel in which my main character travels through time (into the future) 18 years. While the concept of time travel is necessary to the plot, the details are not. Meaning, the book isn't sci-fi, but contains elements that wouldn't normally exist in a contemporary novel, so...
  44. H

    Initial velocity to travel between planets of same m and R

    Homework Statement So there are two planets A and B whose centres are 6r apart. A and B has the same mass M and radius R. What is the minimum velocity(from the surface of B) of the rocket required to launch it from B so that it reaches A ? Homework Equations F=GmM/R^2 The Attempt at a...
  45. Smattering

    Relativistic Speed Travel: What is the Effective Speed?

    Dear all, Let's assume I was planning an interstellar journey with relativistic speed. Being at rest on earth, the distance to the destination is ##d##. Let's further denote the proper time I will need to reach the destination as ##\tau##. Is there an official term for the effective speed...
  46. A

    Watching Earth travel in space....what should be the location

    Dear All, Is it possible to watch Earth orbiting the sun in space like we watch a car coming towards us on a highway ? I mean, I would like to see it coming towards my spaceship at the rate of say 50 km/hr. Now some questions - 1. What should be my location and speed of my spacecraft...
  47. R

    Space Travel to Mars: Overcoming Atmosphere & Creating a Bus Stop in Space

    So off to Mars we go. But really how are we going to get there? The most expensive part of space travel is overcoming atmosphere. So you could say the biggest obstacle of space travel is Earth travel. It takes virtually no energy to cross space but it takes massive amounts to get into space...
  48. E

    Speed of Light: Length Contraction & 20AU Paths

    traveling at the ~speed of light leads to length contraction. based on that wouldn't a 20AU path be shorter if traveled at speeds near the speed of light ?
  49. T

    What is the fastest speed we can travel in space?

    Without taking into consideration any G forces or other phenomena's. So say we slowly and gradually speed up, eliminating any risks of G Force related issues. Fly in empty space without any obstacles in our way and will not be in our way in this scenario, and finally the spacecraft is...
  50. J

    Question about time travel to the past

    Good day to you all, I have been reading Stephen Hawking's book "A Briefer History of Time" (yes, I'm a novice ;)) and I need some verification on if my understanding is correct regarding his theory/conclusion saying that if one travels faster-than-light, he would be able to travel into the...
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