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staglion 发表于 2013-1-27 23:06
你都用英文吧,我也是念的国外的物理,看中文也要反应一会。。。
还有第一个问题,为什么第二个兄弟一定 ...
An inertial frame of reference is defined as one where the reference is subjected to newton's first law i.e. it stays at rest or moves at constant velocity unless an external force acts upon it.
In the situation of the twin paradox, only the second twin is subjected to an acceleration by the rocket engine, both while he took off and he turns around to go back to earth. Thus the inertial frame of reference is not symmetrical in this sense, as no force acts upon the first twin.
Following the calculations of Lorentz transformation, we can then be able to find the time dilation. Since the second twin is travelling near the speed of light, he would have aged slower. Thus younger when he met his brother. |
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