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relativity

# relativity - Announcements Review for Test#3 Nov 11 Topics...

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1 Announcements Homework #8 due today Test #3 Thursday, Nov 10 Review on Wednesday, Nov 9 from 3:25 – 3:55pm Review for Test #3 Nov 11 Topics: Stars (including our Sun) The Interstellar medium Stellar Evolution and Stellar Death Gamma Ray Bursts Neutron stars, pulsars and magnetars Black Holes and Special Relativity Methods Conceptual Review and Practice Problems Chapters 9 - 13 Review lectures (on-line) and know answers to clicker questions Try practice quizzes on-line Bring: Two Number 2 pencils Simple calculator (no electronic notes) Reminder: There are NO make-up tests for this class Classical Relativity 1,000,000 m/s 1,000,000 m/s How fast is Spaceship A approaching Spaceship B? Both Spaceships see the other approaching at 2,000,000 m/s. This is Classical Relativity. Animated cartoons by Adam Auton DEMO Einstein s Special Relativity 1,000,000 m/s 0 m/s 300,000,000 m/s Both spacemen measure the speed of the approaching ray of light. How fast do they measure the speed of light to be? 4 There was an old lady called Wright who could travel much faster than light. She departed one day in a relative way and returned on the previous night. Stationary Man traveling at 300,000,000 m/s - press A Man traveling at 1,000,000 m/s traveling at 301,000,000 m/s – press B All observers measure the SAME speed for light. Special Relativity 5 Postulates of Special Relativity 1 st Postulate The laws of nature are the same in all uniformly moving frames of reference. Uniform motion – in a straight line at a constant speed Ex. Passenger on a perfectly smooth train Sees a train on the next track moving by the window Cannot tell which train is moving If there are no windows on the train No experiment can determine if you are moving with uniform velocity or are at rest in the station! Ex. Coffee pours the same on an airplane in flight or on the ground. 6

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2 Combining Everyday Velocities Imagine that you are firing a gun. How do the speeds of the bullet compare if you are: At rest with respect to the target? Running towards the target? Running away from the target? 7 The Speed of Light How does the measured speed of light vary in each example to the right? 8 The Speed of Light How does the measured speed of light vary in each example to the right?
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