1. Homework Help

   1. Introductory Physics Homework

      How to fix this electric circuit

   2. Advanced Physics Homework

      Eigenvector of raising operator

   3. Precalculus Mathematics Homework

      Probablity of Opening a Pushbutton Lock

   4. Calculus and Beyond Homework

      What is the probability of getting r heads before s tails?

   5. Biology, Chemistry and Earth Homework

      Microscopy magnification problem

   6. Engineering and Computer Science Homework

      Conduction with thermal energy generation

2. Science Education and Careers

   1. Science and Math Textbooks

      What are you reading now? (STEM only)

   2. Academic Guidance

      Currently available free online graded/interactive courses

   3. Educators and Teaching

      Teaching high school students for the first time

   4. Career Guidance

      Searching for jobs in the USA, should I quit?

3. Physics

   1. General Physics

      Feasibility of a L1 Gravity Swing Cold Launch?

   2. Classical Physics

      Doubts about the mechanics of walking

   3. Quantum Physics

      Would this experiment disprove Bohmian mechanics?

   4. Special and General Relativity

      Relativistic billiard balls.

   5. Atomic and Condensed Matter

      Solid-liquid critical point

   6. High Energy, Nuclear, Particle Physics

      Tachyon and antiparticle difference

   7. Beyond the Standard Model

      Hardy's approach to quantum gravity and QM interpretation

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Integrating partial derivatives in a field equation

   2. Cosmology

      What are these diagrams showing about GR?

5. Mathematics

   1. General Math

      Magnitude and Size

   2. Calculus

      2nd derivative of angular displacement wrt time

   3. Differential Equations

      Finite Difference Scheme - Plume Entrainment

   4. Topology and Analysis

      Doubt on function of sets

   5. Linear and Abstract Algebra

      Lagrange multipliers on Banach spaces (in Dirac notation)

   6. Differential Geometry

      Defining a Contact Structure Globally -- Obstructions?

   7. Set Theory, Logic, Probability, Statistics

      Proof of the identity A\(A\B)=B

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Matlab toolboxes essential for every physicist

6. Engineering

   1. General Engineering

      Modern Manufacturing Engineering

   2. Mechanical Engineering

      Help with Geometric Dimensioning and Tolerancing...

   3. Electrical Engineering

      Performance of a complimentary antenna?

   4. Materials and Chemical Engineering

      Industrial production of a drug host

   5. Nuclear Engineering

      Cesium 137 Half-Life vs. Chernobyl Contamination

   6. DIY Projects

      Motor and Batteries

7. Other Sciences

   1. Chemistry

      Problems with Raman Spectroscopy

   2. Programming and Computer Science

      Python not recognizing MAX value in a list

   3. Biology and Medical

      Treatment for the cause

   4. Computing and Technology

      "Gaming" motherboards

   5. Earth

      Why is carbon dating not affected by atmospheric CO2 levels?

8. PF Lounge

   1. General Discussion

      Lame Jokes

   2. Science Fiction and Fantasy Media

      Outside Space-time sci-fi genres

   3. Feedback and Announcements

      How to make a poll?

   4. New Member Introductions

      New member

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