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Frames k and k' are inertial frames. Frame k' is moving at a velocity of magnitude...

Frames k and k' are inertial frames. Frame k' is moving at a velocity of magnitude v relatively to frame k in the direction of the x-axis. There are rigid rods in each frame oriented along the direction of the relative velocity. Someone in frame k measures the rod that is stationary in k as having a length L1 and the rod stationary in frame k' as having a length L'2. What are the lengths of the rods measured by someone in frame k'?

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Answer #1

Always remember person is stationary in his frame and other frame is moving according to him. Length of moving rod is contracted.

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