Back-of-the-Envelope Physics



Background material readings

  • Reading 1 : Purcell's column on AJP

  • Lecture notes

  • Lecture 1 : dimensional analysis I
  • Supplemental Material : The formation of a blast wave by a very intense explosion. II. The atomic explosion of 1945
  • Lecture 2 : dimensional analysis II
  • Supplemental Material : Flexible bars
  • Lecture 3 : dimensional analysis III
  • Lecture 4 : scaling analysis I
  • Supplemental Material : Life's Universal Scaling Laws
  • Supplemental Material : A gentle introduction to scaling relations in biological systems
  • Lecture 5 : scaling analysis II
  • Lecture 6 : scaling analysis III
  • Supplemental Material : Intermediate Asymptotics and Renormalization Group Theory
  • Lecture 7 : Symmetryprinciple I
  • Supplemental Material : On Symmetry in Physical Phenomena, Symmetry of an Electric Field and of a Magnetic Field
  • Lecture 8 : Symmetry principle II
  • Lecture 9 : Symmetry principle III


  • Homework assignment

  • HW1 : Due Feb 22, 2025 in class
  • HW2 : Due Mar 3, 2025 in class
  • HW3 : Due Mar 10, 2025 in class
  • HW4 : Due Mar 31, 2025 in class









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    Last modified: March 23, 2025.