The figure shows a spacetime diagram for two people moving with respect to each

Question

The figure shows a spacetime diagram for two people moving with respect to each other and five events, labelled A through E. The horizontal scale is the x scale, the vertical scale is the t scale, and the tilted axes are the x' and t' scales. I could not upload the image. Point A is on the y-axis up a little bit, point B is at about a 30 degree angle to the right of the y-axis, point C is about 60 degrees to the right of the y-axis, point D is at the origin, and point E is about 30 degrees below the x-axis. (a) Rank the five marked points according to time for the stationary (in this diagram) observer, earliest first. Use the syntax A-B=C-D-E which would mean A happened first, B at the same time as C, followed by D then E. (b) Rank the five marked points according to time for the moving (in this diagram) observer. (c) Rank the five marked points according to position for the stationary observer, from left to right. (d) Rank the five marked points according to position for the moving observer.

Explanation / Answer

(a) E-D-B=C-A

(b) E-C=D-B-A

(c) D=A-B-C=E

(d) A-B=D-C-E

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