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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (5)

0 answers

Post by Nazrin Japiril on June 4, 2013

Thanks overall.. i understand about 65% for this Thermodynamics topic. Now i have to do exercises :)

3 answers

Last reply by: Muhammad Khoder
Fri Apr 25, 2014 3:46 PM

Post by Riley Argue on April 30, 2012

thank you

Entropy and Second Law of Thermodynamics

  • One-way processes: Some processes will happen only in a certain way: heat flows from hot to cold, not the other way around, and air spreads throughout a room, but never get concentrated in only the left half of the room. Energy conservation is satisfied even if a process goes the wrong way; the fact that it does not mean that there must be another property of the system that defines whether a process occurs. This is entropy.
  • For an irreversible process in a closed system, entropy always increases; in a way, entropy change defines the arrow of time.
  • If an amount of heat Q is added to a system at constant temperature T, the entropy changes by Q/T.
  • The entropy statement of the second law of thermodynamics: The entropy of a closed system never decreases. For an irreversible process the change of entropy is positive; for a reversible process it is zero.
III. Waves

Entropy and Second Law of Thermodynamics

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • One Way Process 0:40
    • Hot to Cold (Conserved Energy)
    • Gas in a Insulated Container
    • Entropy
  • Change in Entropy 16:13
    • System at Constant Temperature
    • Insulated Container
    • Work Done by Gas
  • Second Law of Thermodynamics: Entropy Statement 29:30
    • Irreversible Process
    • Gas Reservoir
  • Extra Example 1: Ice Melting
  • Extra Example 2: Partition with Two Gases
  • Extra Example 3: Radiation from Sun