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[Phys-L] Re: "moving clock runs slower" (yes)



Bob Sciamanda wrote:
Apply JD's analogy to the momentum-energy four vector of a particle. In its
proper frame its 3-momentum and 3-velocity are zero. In another inertial
frame, it has non-zero 3-momentum/velocity. This spatial component of the
momentum-energy four vector is merely a projection (a shadow) of the
magnitude invariant 4-vector upon the space axes of the new frame. It must
follow, by the JD analogy, that the particle is not really moving.

Huh?

Some analogies are better than others.

IMHO the analogy between space and time is rather tight.
The analogy between the length of a ruler and the timing
of a clock is rather tight. In particular proper length
is analogous to proper time.

The analogy between length and velocity is not nearly so
tight.

Arguing that analogy "A" is bad because analogy "B" is bad
is a worthless form of argumentation. I come up with an
unlimited number of bad analogies; that does not mean that
all analogies are bad.
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