class5_simultaneityTimeDilation_asGiven

class5_simultaneityTimeDilation_asGiven - Announcements...

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Announcements • Reading for Wednesdy: Sec. 1.10 • Help room Monday, 3-5pm, today . • Homework #2 due Wed. at 10AM.
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Simultaneity Today: • Now we’ve got clocks under control • Do events occur at the same time (i.e., simultaneously?) • Says who?
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Time Proper Time between two events is: a) The time measured between the two events by pairs of observers in any inertial reference frame. b) The time measured by two clocks that are local for each event. c) The time measured between the events in a frame where the two events happen at the same place. d) The time measured between events by the observer at the origin of any inertial frame.
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Synchronizing clocks At the origin, at three o’clock, the clock sends out a light signal to tell everybody it’s three o’clock. Time passes as the signal gets to the clock at x = 3m. ... -3 -2 -1 0 1 2 3 ... When the signal arrives, the clock at x=3m is set to 3:00 plus the 10 ns delay .
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Simultaneity in one frame ... -3 -2 -1 0 1 2 3 ... Using this procedure, it is now possible to say that all the clocks in a given inertial reference frame read the same time. Even if I don’t go out there to check it myself. Now I know when events really happen, even if I don’t find out until later (due to finite speed of light).
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Reliable Observers with synchronized clocks Lucy Ricky Ethel Fred (does not appear in this course)
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Two firecrackers sitting on the ground explode. Lucy, sitting on the ground halfway between the firecrackers, sees them explode at the same time. Ricky is sitting on the ground next to firecracker 2. According to Ricky, which firecracker explodes first?
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This note was uploaded on 11/12/2011 for the course PHY 317L taught by Professor Ritchie/lang during the Fall '08 term at University of Texas at Austin.

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class5_simultaneityTimeDilation_asGiven - Announcements...

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