l6p - Today Announcements HW#3 is due tomorrow Wednesday...

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ISP209s8 Lecture 6 -1- Today • Announcements: – HW#3 is due tomorrow, Wednesday Jan 30 th at 8 am. – Look for the next two extra credit problems starting tomorrow – HW#4 will be due next Wednesday, Feb 6th • Vectors • Special Relativity ISP209s8 Lecture 6 -2- Vector Addition and Subtraction Addition Subtraction ISP209s8 Lecture 6 -3- Example of the use of vectors Velocity of stream Rowing velocity River Actual Velocity River Actual Velocity ISP209s8 Lecture 6 -4- How long to cross the river? Velocity of stream Rowing velocity River ACROSS speed rowing river the across distance time = The rowing speed ACROSS is the magnitude of the boat’s velocity directed toward the opposite bank.
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-5- Vectors You are here. You want to be here. river D Total r+D river K Total r+K ISP209s8 Lecture 6 -6- Albert Einstein • Poor high school student – did not talk till age 5 • Patent clerk in 1905 • In 1905 published three papers that changed scientific thought – Special relativity (moving clocks run slow) – Quantization of light (foundation of quantum mechanics) – Brownian motion (foundation of statistical physics) • Was able to do this, in part, by asking simple questions • Train story… ISP209s8 Lecture 6 -7- The principle of relativity Every nonaccelerated observer observes the same laws of nature. In other words, no experimental performed within a sealed room moving at an unchanging speed and direction can tell you whether you are standing still or moving. ISP209s8 Lecture 6 -8- A consequence – speed of light flashlight Albert What is the speed Albert measures for light? A). 3.0E8 m/s (we often write this as c)
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l6p - Today Announcements HW#3 is due tomorrow Wednesday...

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