Re: Rel. Speed
- From: valls@xxxxxxxxxxx
- Date: Fri, 29 Jun 2007 08:54:59 -0700
On 27 jun, 21:17, "razyrel" <razy...@xxxxxxxxxxxxxxxxxx> wrote:
Suppose a spaceship is moving at a constant speed of 0.8c.Your statement is ambiguous by two different reasons. First, you don't
specify if the mentioned speed correspond to a relative velocity
between the moving ship and another moving entity (sometimes named
"closing velocity"), or to the ship velocity in some specific inertial
frame. Second, whatever the previous case, you don't specify in what
specific inertial frame the speed can be measured.
Then the ship sends a pulse of light to the same direction as of the ship.Your statement is ambiguous by three different reasons. First, in the
direction viewed in what inertial frame?, second, in what medium the
pulse is travelling? (vacuum, air, water, etc.), and third, is moving
the medium?
Questions:You have so many ambiguities, that I prefer to answer the questions
after you resolve them.
[snip]
RVHG (Rafael Valls Hidalgo-Gato)
.
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