posted on May, 20 2003 @ 12:14 PM
Originally posted by seedy_sid
for this example ill use planet A and planet B ok?
right
light takes 1 year exacally to travel from Planet A to Planet B, say you travel from Planet A to Planet B in 6months, leaving on january 1st 2004 and
arriving june 1st 2004, you have traved 2 times the speed of light, yet you have still gone forward in time, see simple mathmatics
Well, not quite. You're basing this assumption off of the priciple of Galilean Relativity (whether you know it or not). This is used in everyday
observations and is consistent with our intuitive notion of time in space.
Dealing with events that occur at or near the speed of light, this theory goes out the window, so to speak.
Example: Suppose a light pulse is sent out by an observer ( S' ) standing in a boxcar moving with velocity v relative to a stationary observer (S)
standing alongside the track. The light pulse has speed c relative to S'. According to Galilean relativity, the pulse speed relative to S should be
c+v. This is not the case and is where Einstein's Special Theory of Relativity comes into play.
From here, there are a lot of things like time dilation, length contration and other mind-bending things that contribute to Einstien's Special Theory
of Relativity.
The math involved in proving this is not difficult and uses what is called Lorentz Velocity Transformation Equations. Here is an example from one of
my old physics books:
Problem: Imagine a motorcycle moving with speed 0.80c past a stationary observer. IF the rider tosses a ball in the forward direction with a speed
of 0.70c relative to himself, what is the speed of the ball relative to the stationary observer?
Solution: The speed of the motorcycle relative to the stationary observer is v=0.80c. The speed of the ball in the frame of reference of the
motorcyclist is u'x=0.70c. Therefore, using the Lorentz velocity transformation equation the speed ux of the ball relative to the stationary
observer is:
ux=(u'x+v)/(1+(u'x*v/c^2))=(0.70c+0.80c)/(1+((0.70c*0.80c)/c^2)) = 0.96c
Q.E.D.
This PROVES that faster than light travel is IMPOSSIBLE contrary to what many people who have posted in this forum believe. If you can prove
otherwise, go for it. You'll be famous.
[Edited on 20-5-2003 by SeaBass]