- #36

Nugatory

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Spend that time. It will be time well spent.Stephanus said:This quote needs some time to understand.

Well, seeing as how the very first sentence of that wikipedia article say "TheIs ladder paradox similar (perhaps not precise the same) as barn paradox?

**ladder paradox**(or

**barn-pole paradox**)..." i'd have to say yes.

Yes (and I seem to recall some previous posts saying this). In fact, when you're drawing space-time diagrams, if the axes of one inertial frame are perpendicular, then the axes of all other inertial frames will not be. A corollary is that whenever you draw a spacetime diagram, you get to choose which frame's axes are the perpendicular ones... Just remember that this angle has no physical significance whatsoever, and no matter which frame's axes are drawn perpendicular, the spacetime diagram is showing the same events and the same physics. Which frame's axes are perpendicular is about as important as the color of the ink you use to draw them.Axes don't have to be perpendicular. They can be slanted like the red arrow t' and x'. Is this true?

No. They are related but not the same. The train experiment shows why there is relativity of simultaneity and the pole-barn paradox shows why you'll get in trouble if you forget it.Does the ladder/barn paradox take the concept of the famous train experiment? Where the light from the front and the back of the train hits the center observer at the same time.