【 在 shadowmoon.bbs@bbs.cis.nctu.edu.tw (使用者綽號) 的大作中提到: 】
: ==> 在 yduj@cis_nctu (Love in Physics) 的文章中提到:
: > 不會...還會有一段time retard
: 我認為會
: 這又不是波的傳遞
: 兩端會同時移動
所謂 rigid boby 是不存在的
不用說 相對論中沒有 rigid body, 即使 classical meshanics 也是不存在
這只是假設狀況
Let me quote one paragraph from "Special Relativity" by A. P. French
One particular consequence of the physical speed limit equal to c is that the
classical concept of an ideal rigid body finds no place in special relativity.
(And strictly speaking, it cannot be justified in classical mechanics either.)
For by a rigid body we mean an object along which physical information can be
transmitted in an arbitrarily short time, so that the object is set in motion
instantaneouly, as a single unit, when a force is applied to any point in it.
For any ordinary box the information that one end has been struck is
transmitted as an elastic wave, which we know is many orders of magnitude
slower than a light signal.
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