1. Homework Help

   1. Introductory Physics Homework

      Find the transient current in this circuit

   2. Advanced Physics Homework

      Expectation values and probabilities for spinors in a well

   3. Precalculus Mathematics Homework

      Are two coincident lines the same line?

   4. Calculus and Beyond Homework

      Tensor Covariant Derivative Expressions Algebra (Fermi- Walk

   5. Biology, Chemistry and Earth Homework

      Calculating the pH

   6. Engineering and Computer Science Homework

      Offset slider question

2. Science Education and Careers

   1. Science and Math Textbooks

      Transistor literature (books, links, articles) for learning more about them...

   2. Academic Guidance

      Platform for theoretical physicists?

   3. Educators and Teaching

      Equations: whiteboard vs slides

   4. Career Guidance

      I want to start an Aerospace Company

3. Physics

   1. General Physics

      What is the relationship between gravity and density?

   2. Classical Physics

      Working mechanism of NEFFUL clothing

   3. Quantum Physics

      Measurement problems?

   4. Special and General Relativity

      Is the mass relative?

   5. Atomic and Condensed Matter

      Optical reflection of metals

   6. High Energy, Nuclear, Particle Physics

      Peskin Schroeder page 14

   7. Beyond the Standard Model

      Causal Fermion System and revival of Dirac Sea

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Stellar Thermal Energy with no Nuclear source

   2. Cosmology

      10,000 black holes near Sagittarius A ?

5. Mathematics

   1. General Math

      Limit of an extension

   2. Calculus

      Minimization using Lagrange multipliers

   3. Differential Equations

      What's the difference between 1000e^0.05t and 1000*1.05^t?

   4. Topology and Analysis

      Compact subspace in metric space

   5. Linear and Abstract Algebra

      Eigenproblem for non-normal matrix

   6. Differential Geometry

      Coordinate representation of a diffeomorphism

   7. Set Theory, Logic, Probability, Statistics

      Please explain "enumerable"

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Complex output from a real integral

6. Engineering

   1. General Engineering

      Wind Turbine Hydraulic to Electrical Conversion

   2. Mechanical Engineering

      Is Shear Stress Vertical or Horizontal in I-Beam Webs?

   3. Electrical Engineering

      How many Amp turns around the Earth for this flux density?

   4. Materials and Chemical Engineering

      Material testing machine

   5. Nuclear Engineering

      I want to learn how to do burn up calculations for reactor

7. Other Sciences

   1. Chemistry

      How can I test the ph of foods

   2. Programming and Computer Science

      Large Joins in Large Databases. How to find Keys?

   3. Biology and Medical

      Endocrine glands and emotions

   4. Computing and Technology

      How to erase data?

   5. Earth

      Why is it colder over even a small highland?

8. PF Lounge

   1. General Discussion

      Moonscape Files for 3D printing

   2. Science Fiction and Fantasy Media

      Yellow Submarine: 50 years

   3. Feedback and Announcements

      PF Betterment Survey Staff Responses

   4. New Member Introductions

      Rapscallion neophyte intro

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