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Unformatted text preview: Announcements Reading for Friday: TZD 1.7 1.8 Homework #1 is posted; due at beginning of class on Friday next week. First midterm is on Tuesday, February 9, 7:30pm 9:15pm. Contact me immediately 7:30pm-9:15pm. Contact me immediately if you cannot make this date! Need special accommodations? See me! Office hours: Wed. 1pm 3pm. Gamow tower F-527. Upon request: a set of pre-lecture notes are available on the course web-page. Pre-class notes Replace these notes after each class with the actual lecture notes. These notes are not a substitute for the reading assignments! Today Galilean relativity (cont.) Inertial frames in classical physics. Motivation for special relativity Motivation for special relativity Strange things about Speed of light. Interferometers Light: the ultimate yardstick. Compare two reference frames (now in one-dimension only) ... 3 2 1 0 1 2 3 .. Frame S has origin here. x ... -3 -2 -1 0 1 2 3 ... ... -3 -2 -1 0 1 2 3 ... Frame S has origin here, at x=3m according to reference frame S. (The frame S is drawn below S so you can read both axes.) x Compare two reference frames (now in one-dimension only) ... 3 2 1 0 1 2 3 .. x ... -3 -2 -1 0 1 2 3 ... ... -3 -2 -1 0 1 2 3 ... Observer in S measures ball at x = 2m. Observer in S measures ball at x = -1m. x Important conclusion Q: Who is right? a) Observer in S b) Observer in S Observer in S finds the ball at x = 2 m Observer in S finds the ball at x = -1 m Q1 c) Both are right d) Neither is right Two observers in different reference frames can give a different description of the same physical fact (in this case, the location of the ball.) Reading Quiz (closed book, no discussions) An inertial reference frame is one: a) that is not moving b) that is not accelerating Q2 c) in which objects are a fixed distance apart d) in which observers are a fixed distance apart e) in which nothing is moving Inertial reference frames TZD 1.3 Inertial reference frames V Imagine a train car (its always a train!) moving on a straight track with constant velocity with respect to the...
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