Travel Definition and 995 Threads

i have a question for your minds to wonder about. i don't know the answer but i would love to hear your opinions or facts if you have any. now i am probably the hugest trekkie a person can be. i love star trek, it is one of the things that got me into science. anyways, what makes Star Trek...

this came to me in a dream state meditaion a few days ago everything from light to sound to time all travel along some line and travel all at different speeds. but if you are able to cause mulitple fission explosion for a brief moment everything around that implossion will be sucked inward...

towing a travel trailer... hello everyone, i belong to several classic trailer sites and there is an issue concerning towing a trailer without brakes. can someone tell me how to determine the force generated, say in pounds per square inch, of a trailer weighing 1400lbs, moving at 65 miles...

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

does anyone thinks time travel is possible?

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...

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

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...

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...

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

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...

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...

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...

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...

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...

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...

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 +...

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...

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...

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?

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...

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!

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?

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...

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

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?

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...

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?

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...

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

Anyone have any good reads they want to recommend?

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...

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...

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...

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...

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...

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?

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...

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.

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

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...

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"?

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...

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...

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...