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l12 - Today Announcements HW#5 is due by 8:00 am tomorrow...

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ISP209s8 Lecture 12 -1- Today • Announcements: – HW#5 is due by 8:00 am tomorrow, Wednesday February 20th. HW#6 is due next week. – The third extra credit problem is due tomorrow at 8:00am Entropy and the Second Law of Thermodynamics Electric and Magnetic Forces
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ISP209s8 Lecture 12 -2- Energy and Entropy - Pendulum Example Energy The thermal energy (heat) is “lost”
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ISP209s8 Lecture 12 -3- Entropy Entropy is a measure of the number of ways a system can be arranged. S = Heat/T – thermal energy goes toward increasing the entropy Second Law of Thermodynamics – The entropy of a closed system always increases. As the pendulum swings useful energy is lost to increasing the random motion of the air and pivot If this is true, we can’t go back in time. There is no way to recollect the thermal energy and make the pendulum swing higher (that is with a closed system).
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