1. Homework Help

   1. Introductory Physics Homework

      Electric field question

   2. Advanced Physics Homework

      Bound state problem

   3. Precalculus Mathematics Homework

      Bond's yield to maturity

   4. Calculus and Beyond Homework

      Dimensionality of the sum of subspaces

   5. Biology, Chemistry and Earth Homework

      IUPAC nomenclature question

   6. Engineering and Computer Science Homework

      Three-phase circuit: Why Z_Ye is parallel with Z_Δ?

2. Science Education and Careers

   1. Science and Math Textbooks

      Books on Physical chemistry

   2. Academic Guidance

      What’s after Physics C?

   3. Educators and Teaching

      How is physics knowledge used in everyday life?

   4. Career Guidance

      Almost done with bachelor of nuclear engineering, now what ?

3. Physics

   1. General Physics

      Photon exchange

   2. Classical Physics

      Uniform Circular Motion and Centripetal Acceleration (non-intuitive)

   3. Quantum Physics

      Difference between an electromagnetic field and a photon?

   4. Special and General Relativity

      Relative Truth

   5. Atomic and Condensed Matter

      Two questions on Feynman diagram and Green's function

   6. High Energy, Nuclear, Particle Physics

      Length Contraction of Protons in the LHC

   7. Beyond the Standard Model

      Simple thought experiment merging GR and QT

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Front Seat to the Galaxy

   2. Cosmology

      First Life

5. Mathematics

   1. General Math

      Gabriel's Horn, Inside vs. Outside Surface area

   2. Calculus

      Evaluating an integral issue

   3. Differential Equations

      solving PDE's with chebychev FFT

   4. Topology and Analysis

      Understanding the "branch cut argument"

   5. Linear and Abstract Algebra

      Forcing conditions in a solution of an under-determined system

   6. Differential Geometry

      Christoffel symbol and einstein summation convention

   7. Set Theory, Logic, Probability, Statistics

      Why is the Axiom of Power Set needed?

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      3D parametric vector plot question

6. Engineering

   1. General Engineering

      Bridge Collapse Genoa - Informed Engineering Perspectives

   2. Mechanical Engineering

      Otto and diesel cycle

   3. Electrical Engineering

      Bench test AC transformer from stereo tube equipment

   4. Materials and Chemical Engineering

      Volume translated Peng-Robinson equation of state

   5. Nuclear Engineering

      Can nuclear weapons destroy the world?

   6. DIY Projects

      Resources for DIY Projects

7. Other Sciences

   1. Chemistry

      When Cl, Br, I turn into Cl+, Br+ and I+?

   2. Programming and Computer Science

      Orbital Mechanics in Unity Game Engine for Augmented Reality - Comments

   3. Biology and Medical

      Carl Woese's Inflence on Modern Biology

   4. Computing and Technology

      Upgrading Ubuntu

   5. Earth

      42% of Sea Level rise due to human water use?

8. PF Lounge

   1. General Discussion

      Lame Jokes

   2. Science Fiction and Fantasy Media

      Effects on the body if cells can't divide

   3. Feedback and Announcements

      Most Likes Page

   4. New Member Introductions

      Free to a good home!

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