1. Homework Help

   1. Introductory Physics Homework

      Equivalent resistance of a circuit

   2. Advanced Physics Homework

      Show that the Hamiltonian commutes with Angular momentum

   3. Precalculus Mathematics Homework

      Inverse transformation help

   4. Calculus and Beyond Homework

      Determine function with given properties

   5. Biology, Chemistry and Earth Homework

      Problem about Nitrate electrodeposition

   6. Engineering and Computer Science Homework

      Heat and Mass Transfer: Thermal Radiation Circuit

2. Science Education and Careers

   1. Science and Math Textbooks

      Kevin Brown Math Pages

   2. Academic Guidance

      I need a bit of help (thesis submitted, lack of publications)

   3. Educators and Teaching

      Equations: whiteboard vs slides

   4. Career Guidance

      Job Selection Criteria: Money versus Happiness

3. Physics

   1. General Physics

      Airplane question -- How to compensate for losing engine power on one wing...

   2. Classical Physics

      A view of the double-slit experiment

   3. Quantum Physics

      Qualitative plots of harmonic oscillator wave function

   4. Special and General Relativity

      Covariant Form of $E_{1}E_{2}|\vec{v}|$

   5. Atomic and Condensed Matter

      Question about Powder X-ray diffraction experiment

   6. High Energy, Nuclear, Particle Physics

      SuperKEKB/Belle II start up: First collisions

   7. Beyond the Standard Model

      What false hints of new physics were most notable?

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Will white dwarfs cool down to blue, then yellow, then red?

   2. Cosmology

      Are the 3 space dimensions "equal"?

5. Mathematics

   1. General Math

      Basic trig questions

   2. Calculus

      Demystifying the Chain Rule in Calculus - Comments

   3. Differential Equations

      Confusion about series solutions to differential equations

   4. Topology and Analysis

      Compact subspace in metric space

   5. Linear and Abstract Algebra

      Diagonalization of matrices

   6. Differential Geometry

      Coordinate representation of a diffeomorphism

   7. Set Theory, Logic, Probability, Statistics

      Sample Test | Component Lifetime

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Integrating Trisurf

6. Engineering

   1. General Engineering

      Propane heater behavior

   2. Mechanical Engineering

      Blower fitted with De Laval Nozzle

   3. Electrical Engineering

      How to know when an LC circuit hits resonance

   4. Materials and Chemical Engineering

      Metals for surgical tools

   5. Nuclear Engineering

      How Much Heat is Produced by Radioactive Waste?

7. Other Sciences

   1. Chemistry

      2^k factorial experiment design

   2. Programming and Computer Science

      Question about running "executables" without source code

   3. Biology and Medical

      Effects of 25 minutes of beta radiation exposure?

   4. Computing and Technology

      Tips & Tricks for web searches focusing on discussion forum sites

   5. Earth

      Cloud cropping/plureite sensors

8. PF Lounge

   1. General Discussion

      What kind of flowers are these? (eerie)

   2. Science Fiction and Fantasy Media

      Avengers: Infinity War

   3. Feedback and Announcements

      Thoughts/Questions on the ban of free energy discussion

   4. New Member Introductions

      Hi..I am newbie here

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