Physics Help Forum regarding the length contraction and time dilation in special theory of relativity
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 Oct 5th 2016, 10:57 AM #1 Junior Member   Join Date: Oct 2010 Posts: 10 regarding the length contraction and time dilation in special theory of relativity Respected Sir, as i read in relativity, some writer use inverse Lorentz's transformations equations and some other use Lorentz's transformations for solving length contraction and time dilation expressions with any logic that which one used in which situation. clear me this. with regards vikas
Oct 5th 2016, 12:27 PM   #2
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 Originally Posted by vikas katoch Respected Sir, as i read in relativity, some writer use inverse Lorentz's transformations equations and some other use Lorentz's transformations for solving length contraction and time dilation expressions with any logic that which one used in which situation. clear me this. with regards vikas
You are going to need to be more specific. I don't know what you are asking for here.

-Dan
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 Oct 5th 2016, 01:34 PM #3 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,354 I think the OP is saying that sometimes you divide by the Lorentz factor and sometimes you multiply by the Lorentz factor. In observing an object in a different inertial frame we determine the apparent length of the moving object by dividing the rest length of the object by the Lorentz factor, gamma: $\displaystyle \gamma = \frac 1 {\sqrt{1-v^2/c^2}}$ $\displaystyle L = \frac {L_0}{\gamma}$ This yields L < L_0, so the length of the moving object appears contracted. But for a clock observed in a different inertial frame we multiply the proper time of the moving clock time by the Lorentz factor: $\displaystyle T = T_0 \gamma$. Hence the moving clock appears to move slower, and time is dilated (made longer). topsquark likes this.
 Oct 8th 2016, 07:00 AM #4 Junior Member   Join Date: Oct 2010 Posts: 10 thanks thanks means depend on proper

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