Re: beginner thought experiments


Sue... wrote:
PD wrote:
Sue... wrote:
PD wrote:
Sue... wrote:
PD wrote:
Sue... wrote:
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?

Space ships melt long before they achieve relativistic speeds.


Nonsense. Your chair is traveling at a relativistic speed right now.
Oh, I suppose you haven't considered the frame of reference this is
measured in....

What does a luge pilot use as a point of reference and why?

The ground.
Why? Convention.
Not for any physical reason.
Why do you ask?

The luge pilot is concered about what he might interact with
physically (ouch) so the relative speed of ice schards below
his ear lobe tend to be of far greater concen than the ice shards
on Mars, even tho those on Mars are moving much faster.

"Coulomb's Law"
http://farside.ph.utexas.edu/teaching/em/lectures/node28.html
"Railway vacuums" ;-)
http://www-ssg.sr.unh.edu/ism/what1.html

We don't measure light. We measure the motion of a charge.
What a charge is interacting with, can't be ignored by
choosing a distant point of reference any more than the
luge pilot can minimise his injuries by measuring his speed
relative to his sled.

Sue...


And what do spaceships interact with to melt long before they reach c
(measured relative to what?)?

If there is any truth to this business about Coulomb force
objects tend to interact with the nearest matter.
http://www-ssg.sr.unh.edu/ism/what1.html

Luge logic dictatates that is the matter we should
be concerned with.

You didn't answer the question Dennis. If a spaceship is 6 light years
from the Sun and 7 light years from the nearest other star, and the
spaceship's speed is 0.4c with respect to the Sun and 0.55c with
respect to the other star, where is the nearest matter that will make
the spaceship melt?


Why do you keep asking 'measured relative to what'?
Are you under some delusion that physical phenomena
cares a flip for where you measure from? If Sally doesn't
see the cat when it dies, can that alter Jimmy's need
to bury the the cat.

Sue...

.

Relevant Pages

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  • Re: beginner thought experiments
    ... A space ship travelling at close to the speed of light shoots a ... light or does it travel at the speed of light minus the speed of the ... Space ships melt long before they achieve relativistic speeds. ...
    (sci.physics.relativity)
  • Re: beginner thought experiments
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    (sci.physics.relativity)