l2p - Today Announcements HW#1 is due Wednesday by 8:00 am...

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ISP209s10 Lecture 2 -1- Today • Announcements: HW#1 is due Wednesday by 8:00 am The first LONCAPA extra credit is due 1/27 by 8:00 am. Register your clickers in LON-CAPA Review from last time (time dilation, etc.) • Units Scalars, Vectors and Tensors Motion and Newton’s Law of Inertia ISP209s10 Lecture 2 -2- Overrides and Add-Drops Override period expired on Friday 1/15 The final overrides I granted were on Thursday. I could not give anymore since we are technically over the room capacity. Now the only option is to get an add/drop slip from the ISP office and ask me to sign it. HOWEVER, I cannot sign this until the enrollment goes down below the room capacity. Check back with me before class on Thursday. If you are eventually able to get me to sign your add slip, it is your responsibility to do extra credits etc. to compensate for the missed HW #1. If you want to DROP the course, you can still do this online. ISP209s10 Lecture 2 -3- Physics Help Room Hours TA = Steven Barthelemy Monday: 1pm - 3pm Tuesday: 4pm - 6pm Friday: 1pm-2pm ISP209s10 Lecture 2 -4- Review: Einstein’s Postulates 1) Principle of Relativity: Laws of Nature are the same in all non-accelerated (aka “inertial”) reference frames. 2) Principle of the constancy of the Speed of Light: The speed of light in empty space is the same for all non-accelerated (aka “inertial”) reference frames: c = 300,000 km/s From these 2 postulates and nothing more, Einstein’s Special Theory of Relativity follows
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ISP209s10 Lecture 2 -5- Review: Relative Motion with Mort and Velma Velma rides a train that is going 50 m/s relative to Mort Velma throws a baseball at a speed 20 m/s (relative to herself ) towards the front of the train From Mort’s perspective, how fast is the baseball going? Ans: 50 + 20 = 70 m/s This is common sense. The velocities of the train and ball add. We call it “Galilean” or “Newtonian” relativity . ISP209s10 Lecture 2 -6- Review: Constancy of Lightspeed “c” You might expect Mort measures the speed of Velma’s light beam to be c + .25c = 1.25c. This is NOT the case. They both get c= 300,000 km/s. c = 300,000 km/s !!! ISP209s10 Lecture 2 -7- Review: Relativity of Time Einstein’s simple thought experiment with “light clocks” implied some mind-blowing consequences about Time: Moving clocks run slow (I.e., Time slows down) Time is relative according to your reference frame 2 2 2 0 1 1 1 1 ! " " # = $ $ % & ( ) # = = c v t t time that elapses on your watch time that elapses on the moving watch “Time-Dilation” ISP209s10 Lecture 2 -8- Review: Confirmation of Time Dilation Airplane experiment: A high-precision clock is taken on a long jet ride that circles the Earth several times. An identical clock stays on the ground. When the 2 are compared after the trip, the one that was on the jet is behind (I.e., slower) than the one on the ground.
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