Explanation Sometimes it is helpful When describing events on a spacetime diagram as in Figure 2.21. It will be more helpful when only one spatial coordinate x will be used and describe position in x -direction. For having dimension of length as have x use ct instead of time. Spacetime diagrams are also known as Minkowski diagrams because it was first used by H. Minkowski in 1908. In relativity it is important to denote both time and space to describe an event. Thus, it is known as fourth dimension for an event. In figure 2.25a both past and future has been shown, past is the something that happened earlier in time than t = 0 . Something that happened after t = 0 is known as future. present can only be affected by the events within the shaded area below t = 0

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Chapter 2, Problem 14Q

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Reason for not including the spatial coordinate z when drawing the light cone.

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Chapter 2 Solutions

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Reason for not including the spatial coordinate z when drawing the light cone.

Solution Summary: The author explains why it is not possible to draw a 4D diagram due to presence of three axes spatial coordinates x, y, and z in spacetime.

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Reason for not including the spatial coordinate z when drawing the light cone.

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Chapter 2 Solutions