1. Homework Help

   1. Introductory Physics Homework

      Roller Coaster Question

   2. Advanced Physics Homework

      Calculate the expectation value of V from Ehrenfest's theorem

   3. Precalculus Mathematics Homework

      Proving that there is no rational number whose square is two

   4. Calculus and Beyond Homework

      Finding the kernel of an action

   5. Biology, Chemistry and Earth Homework

      What makes the DNA Double Helix Possible

   6. Engineering and Computer Science Homework

      Wrong value for voltage across capacitor

2. Science Education and Careers

   1. Science and Math Textbooks

      I need a book to solve Schrodinger's eqn numerically

   2. Academic Guidance

      International Physics Studies Program (IPSP) University of Leipzig program review?

   3. Educators and Teaching

      Certificate in creating virtual labs?

   4. Career Guidance

      How beneficial is a minor in Electrical Engineering?

3. Physics

   1. General Physics

      COM of Cosmos?

   2. Classical Physics

      Momentum of a System and External Forces

   3. Quantum Physics

      Is Simultaneity still alive in QM?

   4. Special and General Relativity

      Deriving Lorentz Transformation

   5. Atomic and Condensed Matter

      Fraunhofer's multiple slits versus atomic scatteres (diffraction theory)

   6. High Energy, Nuclear, Particle Physics

      Effect of errors due to branching and acceptances

   7. Beyond the Standard Model

      Loop-and-allied QG bibliography

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Core collapse supernova: the "void" left by the collapsed core?

   2. Cosmology

      Energy for expanding universe

5. Mathematics

   1. General Math

      Problem about a cone and plane cutting it

   2. Calculus

      Gauss' Theorem

   3. Differential Equations

      Green's functions issue

   4. Topology and Analysis

      Confused by the behavior of sqrt(z^2+1)

   5. Linear and Abstract Algebra

      How to show that commutative matrices form a group?

   6. Differential Geometry

      How are basis vectors defined?

   7. Set Theory, Logic, Probability, Statistics

      How to decide between using the z and t tests?

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Numerical approximation of area under curve

6. Engineering

   1. General Engineering

      Help With Understanding Hooke's Law

   2. Mechanical Engineering

      Understanding Yield Strength & Stress Strain Curve

   3. Electrical Engineering

      Power line EMI filter + feedthrough filter for a Faraday cage

   4. Materials and Chemical Engineering

      Best anode materials for water-based hydrogen generator?

   5. Nuclear Engineering

      Why isn't tungsten used in nuclear reactors?

   6. DIY Projects

      Interference Between Two Speakers -- Real Life Version of a HW problem

7. Other Sciences

   1. Chemistry

      Redox titration

   2. Programming and Computer Science

      relation in file

   3. Biology and Medical

      Degeneration of injured cells: granules in cloudy swelling

   4. Computing and Technology

      Switching clock synchronization off under Debian

   5. Earth

      Are there other variables that control climate change?

8. PF Lounge

   1. General Discussion

      How can we feed 20 billion people

   2. Science Fiction and Fantasy Media

      The Short Story Thread. Post Yours Here!

   3. Feedback and Announcements

      Text limit - character count - in a post?

   4. New Member Introductions

      Hello everyone

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