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**Physics, Astronomy & Cosmology / Re: Is this a correct spacetime diagram with world lines?**

« **on:**21/01/2022 22:37:40 »

This is related to my original comment about the angles of some of the lines, ct' in particular.

These are not necessarily wrong since the scales of the two axes are not labeled.

They're both in distance (meters say), but maybe the long x axis goes from 0 on the left to 10 meters on the right, and the shorter ct axis goes from 0 at the bottom to 20 meters at the top, in which case the axes, while both in meters, are simply not to the same scale. So the drawing is not necessarily wrong in that way unless the scales are similar.

If they are scaled similarly, then your diagonal yellow 'high speed rock' is moving at considerably faster than c since it goes to the right faster than it goes up.

These are not necessarily wrong since the scales of the two axes are not labeled.

They're both in distance (meters say), but maybe the long x axis goes from 0 on the left to 10 meters on the right, and the shorter ct axis goes from 0 at the bottom to 20 meters at the top, in which case the axes, while both in meters, are simply not to the same scale. So the drawing is not necessarily wrong in that way unless the scales are similar.

If they are scaled similarly, then your diagonal yellow 'high speed rock' is moving at considerably faster than c since it goes to the right faster than it goes up.

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