| 41. | From the standpoint of physical measurement, a more natural notion of distance between two world lines is the " radar distance ".
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| 42. | One usually takes the proper time of an object or an observer as the curve parameter \ tau along the world line.
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| 43. | It does this by sending a signal along the world line of a person and detecting the echo from the far end.
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| 44. | I was wondering, has anyone followed all the world lines and checked whether they make sense, according to the rules of the film?
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| 45. | For six decades, travelers from around the world lined up at the United States passport office in the International Building at Rockefeller Center.
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| 46. | Following the same argument the range below the origin and between the photon world lines is the absolute past relative to the origin.
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| 47. | Men and women from around the world lined up for hours Monday to pass by the rebbe's walled-in grave in a Queens cemetery.
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| 48. | The globe was divided between America and the Soviet Union, with most of the world lined up in predictable, if occasionally shifting, alliances.
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| 49. | By integration of the equations of motion one obtains the world lines of accelerated bodies corresponding to a sequence of momentary inertial frames.
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| 50. | So far a world line ( and the concept of tangent vectors ) has been described without a means of quantifying the interval between events.
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