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

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

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.

Page1 / 24

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

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online