What is Travel: Definition and 997 Discussions

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. M

    How Fast do Human Feet Travel When Passing Each Other?

    Need some help. How fast are the human feet traveling as they pass each other while walking and running? Thanks.
  2. D

    Exploring the Possibility of Time Travel

    does anyone thinks time travel is possible?
  3. H

    Is the transfer of energy in hydraulics truly instant?

    Hello, This is my first ever post in an entirely science-dedicated forum. On another forum, another user and I theorized that the energy transfer in hydraulics from one point to another is instant. He initially posted about electricity being instant because electrons move at the same speed...
  4. B

    As the waves travel through a medium, they lose velocity

    as the waves travel through a medium, they lose velocity, however the frequency is constant right? thanks
  5. G01

    Where would you like to travel to?

    For me its all about nature. Before I go to any city, I would like to see the arctic tundra (above the tree-line), the savana, the Sahara, the Australian Outback, Antarctica, the rainforests. Human formations can wait! I honestly think that other than my career, seeing the different...
  6. P

    Calculate the resolution in linear travel of the tape

    Nobody replying, so I’ve reframed the question A 24V DC motor has an optical encoder with 500 divisions which outputs the pulse frequency to an electronic counter/timer. The motor has a flat pulley of 31.827mm diameter used as a tape drive. (a) Calculate the resolution in linear travel of...
  7. J

    How fast could the person have to travel?

    a person whose mass is 48 kg wishes to gain 12 kg relativistically with respect to another reference frame. How fast could the person have to travel? the formula is as follows... i Think M is 48 kg mo is 12 kg v=? can anyone help me to do this problem
  8. O

    Cramer's time travel experiment

    There was some publicity recently about John Cramer not being able to get funding for an experiment that he claims could prove "retrocausation" or backward time travel. I'm confused as to what the experiment is supposed to show. Cramer seems to be saying the outcome will depend on whether or not...
  9. G

    Euro Travel Tips: Amsterdam, Florence, Venice, Rome, Madrid & Barcelona

    Amsterdam, Florence, Venice, Rome, Madrid, and Barcelona May25-Jun 10. Any advice on hotels vs. hostels? or recommendations for hotels/hostels? I am going with 3 other people, so if we split the cost of a hotel room it will cost almost the same as a hostel and we get our own...
  10. A

    Any Must-See Places in California for My Upcoming Trip?

    I'm planning a little trip in April to California and I've been asking around a lot to get suggestions for things to do while I'm there. I figure I should ask here too. My plan is to spend one day driving from San Jose to Santa Cruz, Monterey, Gilroy, and back to San Jose, stopping for meals...
  11. M

    Wave travel along a tensioned rope

    Oliver (m=90.0 kg) uses a 4.60 m long rope to pull Jordan (m=53.6 kg) across the floor (μk=0.200) at a constant speed of 1.14 m/s. Jordan signals to Oliver to stop by "plucking" the rope, sending a wave pulse forward along the rope. The pulse reaches Oliver 149.0 ms later. What is the mass of...
  12. M

    Exploring the Twin Paradox: General Relativity & Time Travel

    How many of you over here are familiar with the twin paradox? I am personally quite fascinated with this phenomenon predicted by General Relativity. In a nut shell, since your relative time slows down at speeds close to the speed of light, it implies that if, say, your twin brother were to go...
  13. F

    Von Braun and contribution to space travel [no maths]

    Homework Statement Oh well I'll post here ... There is no mathematics here. It's history based. This question may appear in one of my Physics exams. I just need to verify if my exam response is accurate, as I omitted irrelevant information such as how von Braun forged papers to escape...
  14. B

    Two sinusoidal waves travel in the same direction

    Two sinusoidal waves travel in the same direction and have the same frequency. Thier amplitudes are Y1 and Y2. The smallest possible amplitude of the resultant wave is: a) Y1+Y2 and occurs if they are 180 degrees out of phase b) [Y1-Y2] and occurs if they are 180 degrees out of phase c) Y1 +...
  15. D

    Nanoseconds and Time for Light to Travel

    Homework Statement The problem asks how many nanoseconds does it take for light to travel 1km in a vacuu? Homework Equations I know that 1KM is equal to 1000 meters or 10^3. I also know that 1ns is equal to 10^-9s and light travels at about .3m per ns. The Attempt at a Solution...
  16. U

    Why cant forces travel faster than light speed?

    Why can't "forces" travel faster than light speed? As always, I'll start with a disclaimer that I know next to nothing about physics, just that I have an interest in the subject (actually, relativity kinda scares the hell out of me for some odd reason). Anyways, I am reading through this...
  17. L

    Can photons be accelated or do they always travel at one speed (speed of light)?

    I did a search for optical accelerator but it's not clear to me exactly what is being discussed. If so, has the been an invention to do this?
  18. L

    Radio waves travel at speed of light?

    hi all... Something doesn't quite add up here: A radio wave is an electromagentic wave, right. It therefore travels at the speed of light, right. Then why does it actually take a finite amount time (like secoonds or even miliseconds) to travel a couple of kilometers...
  19. J

    Ageless photon. do photons travel through time?

    when a photon from a distant star arrives on earth, it has not aged. does this mean that it has not traveled through time at all, but only space? thanks!
  20. K

    Do the L4 and L5 points travel in a geodesic?

    Given a two body system like the sun and the earth: Do the L4 and L5 points travel in a geodesic, or is it just the sun and the Earth which do so?
  21. E

    Does wind affect how far sound can travel?

    I feel that this may be a silly question, but, Does wind affect how far sound can travel? I know that the air temperature affects how far a sound can travel (does wind affect air temperature?), but what about wind? I tried to find an answer via google, but I haven't found anything...
  22. C

    Time Travel using the gravitational field of a circulating light beam

    I saw this paper on time travel. Does anyone think its plausible?http://www.physics.uconn.edu/~mallett/main/research_activities.htm
  23. vincentm

    Quantum Entanglement and time travel

    I'm not buying this for reasons of paradoxes, but Brian Greene is saying that time travel backwards is possible. Source what do you guys think?
  24. DaveC426913

    Time dilation in space travel

    Many short story ideas I have involve space travel. I'm looking at the Lorentz transform formula and scratching my head. Is there a relatively straightforward way to use the time dilation formulae and calculate subjective travel times for space travel? Presume a spaceship accelerates at...
  25. A

    How does Gravity travel the speed of light

    How does Gravity travel the speed of light, if it accelerates at 9.8 m/s² on Earth? Shouldn't it travel at a constant c?
  26. S

    Calculating Wave Pulse Travel Time in a Mine Shaft

    1) One end of a rope is tied to a stationary support at the top of a vertical mine shaft 80.0 m deep. The rope is stretched taut by a box of mineral samples with a mass of 20.0 kg attached at the lower end. The mass of the rope is 4.00 kg. The geologist at the bottom of the mine shaft signals a...
  27. C

    Understanding the Concept of Time Travel for Photons

    if photons travel in the speed of light why don't they travel in time
  28. L

    Time Travel book recommendations

    Anyone have any good reads they want to recommend?
  29. K

    Calculating Baseball Travel Time and Distance: 165 km/h, 18.3 m

    A baseball leaves a pitcher's hand horizontally at a speed of 165 km/h. The distance to the batter is 18.3 m. Neglect air resistance. (a) How long does it take for the ball to travel the first half of that distance? s (b) How long does it take for the ball to travel the second half of that...
  30. M

    Light Travel Time from Sun to Earth - HELP-HOMEWORK

    HELP-HOMEWORK...Hi, I have homework that ask "Using the velocity of light find an approximate value for the amount of time that it takes a light ray to travel from the sun to the earth." Now I know the distance between the Earth and the sun is 93 million miles but I'm not catching on to the...
  31. K

    What Sense Does High Velocity Travel Make? - Oh-My-God Particle

    In a description of the discovery of the so-called 'Oh-My-God particle' (http://www.fourmilab.ch/documents/ohmygodpart.html), the following assertion is made: The idea seems to be, essentially, that it would take 21 years to go from Earth to the center of the galaxy at 1516c, while only...
  32. M

    How far will this block travel when launched on the floor?

    I consider myself good in physics, but I was unable to figure this problem out after working on it for almost an hour and a half. I approached it many different ways, but I always hit a dead end or a solution I knew was wrong. Our teacher gave us a wooden block, a meter, stick, and a timer. He...
  33. C

    Light years-distance or light travel time?

    If I use light years to describe large reception distances,say 10 billion,am I also stateing the light travel time? The way I figure it at these distances you would have to increase the light travel time useing the Hubble constant to quantify the increase in space a photon would have to travel...
  34. A

    Assume I travel near c from a planet 5 light years away

    to the earth. I will arrive at Earth a little over 5 years from the time I depart, correct? How many years will I have aged as a passenger on the spaceship and how long will someone on Earth have aged during my journey?
  35. D

    Exploring the Possibility of Time Travel

    Hi. For a physics project, i was to select a topic that interests me, and give a presentation on it. The topic i chose was: "The possibility of time travel" I started to read more into it, and I am beginning to think that its way out of the scope of my knowledge, as most of the information...
  36. S

    By photon's POV, would light travel infinity in no time?

    According to photon's standpoint, since light travels any distance in 0 time, then doesn't it mean that it can travel infinity in 0 time, but for my mind, that doesn't really made sense b/c I thought nothing could reach infinity, but apparently, light can.
  37. R

    What Do Light Waves Travel Through?

    sound waves travel through air; waves on the sea travel through water; what do light waves travel through?
  38. C

    Can Relativity Explain the Possibility of Aliens Visiting Earth?

    This question might not belong in this category, and it may seem a bit of an out there question also... Based on the principals of relativity, if aliens are real (that i hope so), wouldn’t they come back to their planet far into the future after visiting our own planet?? I ask this because they...
  39. M

    Which elements travel in pairs ?

    Which elements "travel in pairs"? This isn't exactly "homework help", just something that's been on my mind for a while. I know that when writing chlorine, oxygen and hydrogen by itself, you need to add a two. Why is this so? And also, what other elements "travel in pairs"?
  40. N

    Exploring the Possibility of Aerospace Engineering Jobs for Space Travel

    I was just wondering what kind of jobs that people have gotten with Aerospace Engineering... I would like to get a research and development job when I get out with at least my masters, although I might go ahead and get my Doctorate. What my ultimate goal is to be able to make traveling in space...
  41. W

    Possible webpage title: Exploring the Nature of Light: Wave or Particle?

    Hi I actually happen to have two questions and hope someone can help me out :) 1) Light as been established as waves, but how is light a wave? Many of the waves I have seen is of a sineoid shape. How do people know that light is in that form? 2) What does light travel in? Soundwaves travel...
  42. vincentm

    Difficulties with interstellar travel

    According to Relativity, if a ship traveling at nearly the speed of light through interstellar space diffuse atoms (mostly Hydrogen, becase simply that is the most abundant atom in the universe, right?) would strike the front of the ship with increased mass, causing radiation. My question is how...
  43. N

    Do massless particles always have momentum in the direction of travel?

    I'm not sure this is the right forum, but I wanted to ask the following (possibly bizarre) question: Is it implicitly assumed that zero rest mass particles have momentum in the same direction as they travel?
  44. A

    Travel & Astronomy: Exploring the Benefits of Combining the Two

    Is traveling a big deal when your an astronomer?
  45. S

    Interesting article on effects of time travel

    Here is an article I think you might enjoy about a topic that has challanged us for years. Its on paradoxes in time travel explaining a lot of the problems involved. Here is the link... http://ezinearticles.com/?Paradoxes-in-Time-Travel&id=224204"
  46. V

    Is Time Travel Really Possible or Just a Myth?

    What do you think of this theory, time travel will never be created because if it was, then people in the future would have come back to the past and we would know about it by now. Unless of course a select few were able to go to the past, and told nor interacted with anyone. But my idea was...
  47. E

    How to travel faster than light - why wont this work?

    what if the size of our main spaceship was unlimited. Let's say our spaceship is the size of our solar system. Reach the highest speed possible without breaking any laws of physics. Lets say -- 90% the speed of light. Now fly a smaller spaceship INSIDE the main ship as fast as you can...
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