lecture28 - Special Relativity Physics 102: Lecture 28 •...

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Unformatted text preview: Special Relativity Physics 102: Lecture 28 • Make sure your grade book entries are correct! e.g. HOUR EXAMS, “EX” vs. “AB” EX = excused, AB = absent = 0 credit • Honors projects are due today May 3 via email: Word/PDF, file name to include your full name • Please fill out on-line ICES forms More important announcements • No discussion this week! (Disc. 13) • Lecture Wed. (May 5) will cover material – Bring “Physics 102 problem solver” – Quiz (put in TA mailbox by Friday, May 7) • FINAL EXAM May 10 & 11 – Review this Sunday May 9, 3pm, 141 Loomis – Extra practice problems will be posted online – Review will work through these problems Inertial Reference Frame • Frame which is in uniform motion (constant velocity) – No Accelerating – No Rotating • Technically Earth is not inertial, but it’s close enough. 7 Postulates of Relativity • Laws of physics are the same in every inertial frame – Perform experiment on a moving train and you should get same results as on a train at rest • Speed of light in vacuum is c for everyone – Measure c=3x10 8 m/s if you are on train going east or on train going west, even if light source isn’t on the train. 9 Weird! Relative Velocity (Ball) • Josh Beckett throws baseball @90 mph. How fast do I think it goes when I am: – Standing still? – Running 15 mph towards? – Running 15 mph away? 90 mph 90+15=105 mph 90-15=75 mph 12 (Review 101 for help with Relative Velocities) Relative Velocity (Light) • Now he throws a photon (c=3x10 8 m/s). How fast do I think it goes when I am: – Standing still – Running 1.5x10 8 m/s towards – Running 1.5x10 8 m/s away Strange but True! 3x10 8 m/s 3x10 8 m/s 3x10 8 m/s 15 Preflight 28.1 Consequences: 1. Time Dilation D D t c 2 = ∆ c D t 2 = ∆ t is call the “proper time”. Here it is the time between two events that occur at the same place, in the rest frame....
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This note was uploaded on 01/25/2012 for the course PHYS 102 taught by Professor Lee during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture28 - Special Relativity Physics 102: Lecture 28 •...

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