l11p - Today Announcements: HW#5 is due by 8:00 am...

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ISP209s7 Lecture 11 -1- Today • Announcements: – HW#5 is due by 8:00 am Wednesday February 20th. – The third extra credit problem is also due Feb 20 at 8:00am. This is a super bonus problem. • Temperature • Second Law of Thermodynamics ISP209s7 Lecture 11 -2- C.P. Snow – Lecture on the Two Cultures 1959 Two Cultures: Humanities and the Sciences There is a danger if the two can not understand each other. Paraphrase of a famous quote: Not knowing what the second law of thermodynamics means is the equivalent of never having read Shakespeare. “I now believe that if I had asked an even simpler question — such as, What do you mean by mass, or acceleration, which is the scientific equivalent of saying, 'Can you read?' … So the great edifice of modern physics goes up, and the majority of the cleverest people in the western world have about as much insight into it as their Neolithic ancestors would have had.” ISP209s7 Lecture 11 -3- Clicker Questions: Bead on a wire Where is the potential energy the highest? Where is the kinetic energy the highest? Where is the speed the same as E? What direction is the acceleration at B? Hint: the track is circular. A) Down B) Up C) Left D) Right h mgh mv = 2 2 1 E ISP209s7 Lecture 11 -4- Time Travel • Einstein's theory of General Relativity explains the origin of gravity by mass distorting space-time • Time is a dimension in a 4-dimensional universe • If time is a dimension like the other three, can we move back and forth in time? Why does time have a direction? Arrow of time • If we can travel back in time, it would be possible for us to
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l11p - Today Announcements: HW#5 is due by 8:00 am...

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