Re: beginner thought experiments

Koobee Wublee wrote:
"snapdragon31" <snapdragon31@xxxxxxxxx> wrote in message
news:1151562301.775788.227990@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Ning Hu wrote:
Hi I have a few thought experiments I like to see how other peoples
opinions are on the results,

Experiment 1:

A space ship travelling at close to the speed of light shoots a
constant stream of Laser beam out of it's back end. To a stationary
observer away from the space ship, Does the beam travel at speed of
light or does it travel at the speed of light minus the speed of the
space ship?. What does the people on the space ship see?


To the stationary observer the beam travels at the speed of light minus
the speed of the space ship. Assuming that the space ship is
travelling at 0.9 c.
According to Newton 1.0 c - 0.9 c = 0.1 c
According to Einstein 1.0 c - 0.9 c = 1.0 c
What the people on the space ship will see depends on who is on the
ship.

Let's say if you are one of the passengers. What would you see?

Hi Koobee, I believe simple maths 1 - 0.9 = 0.1

Experiment 2:

point A, B and C lay on a straight line with B being the midpoint of A
& C. Assuming B to be a stationary point in space. 2 friends depart
from point B in similar space ships, 1 heading for point A and the
other heading for point C at same speed/accelleration, When they reach
their destination, they will both turn back and head back towards B.
Have they aged the same amount when they finally unite?

Let A be Newton and C be Einstein. Both of them agrees that they have
aged the same amount.

You have given an answer that is logical and sound. However,
Larmor/Lorentz/Poincare/Einstein's Lorentz Transform will disagree with
you. In order to stand by that answer, you have to turn your back on
Lorentz Transform. Thus, SR. Are you ready to do so?
Koobee, why my answer does not agree with SR or Lorentz Transformation?
Can you explain?

Between A and B, that is a well known case of twin paradox. Assume B
aged 35 years and A aged 15 years. Similarly when B aged 35 years, C
also would aged 15 years thus A and C would age the same amount. I am
not good at Math or Physics but I am good at applying simple logic.

.

Relevant Pages

  • Re: beginner thought experiments
    ... A space ship travelling at close to the speed of light shoots a ... constant stream of Laser beam out of it's back end. ... Replace S with B and with the friend travelling to A and back ... Now, replace a modified with velocities with the friend ...
    (sci.physics.relativity)
  • Re: beginner thought experiments
    ... A space ship travelling at close to the speed of light shoots a ... observer away from the space ship, Does the beam travel at speed of ... travelling at 0.9 c. ... Larmor/Lorentz/Poincare/Einstein's Lorentz Transform will disagree with ...
    (sci.physics.relativity)
  • Re: beginner thought experiments
    ... A space ship travelling at close to the speed of light shoots a ... observer away from the space ship, Does the beam travel at speed of ... travelling at 0.9 c. ... Larmor/Lorentz/Poincare/Einstein's Lorentz Transform will disagree with ...
    (sci.physics.relativity)
  • Re: beginner thought experiments
    ... A space ship travelling at close to the speed of light shoots a ... observer away from the space ship, Does the beam travel at speed of ... travelling at 0.9 c. ... Have they aged the same amount when they finally unite? ...
    (sci.physics.relativity)