1. Homework Help

   1. Introductory Physics Homework

      What velocity does a train need to go up and down the hill

   2. Advanced Physics Homework

      Covariant coordinates don't co-vary

   3. Precalculus Mathematics Homework

      finding the inverse of ##y=2^{x}##

   4. Calculus and Beyond Homework

      Find the expression for the sum of this power series

   5. Biology, Chemistry and Earth Homework

      Equal electronegativities and covalent bond formation

   6. Engineering and Computer Science Homework

      Reverse-acting proportional pressure controller

2. Science Education and Careers

   1. Science and Math Textbooks

      Asking for recommendation on Fluid Dynamics and CFD textbooks

   2. Academic Guidance

      Should I start with a basic physics book without calculus?

   3. Educators and Teaching

      Hall's Marriage Theorem

   4. Career Guidance

      Changing my college major to statistics -- Should I?

3. Physics

   1. General Physics

      What constitutes a closed end in acoustic resonance in tubes

   2. Classical Physics

      Conceptual question about the Coriolis force and the weather

   3. Quantum Physics

      Role of determinate states in quantum mechanics

   4. Special and General Relativity

      Newtonian analogue of energy-momentum relation?

   5. Atomic and Condensed Matter

      Selected area diffraction

   6. High Energy, Nuclear, Particle Physics

      Reference for Hadron mass & spin problem?

   7. Beyond the Standard Model

      Quantization isn't fundamental

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Barnard's Star, 6 Light-Years Away, May Have Cold SuperEarth

   2. Cosmology

      What would happen if dark energy density decreased?

5. Mathematics

   1. General Math

      Cancelling zero

   2. Calculus

      How to transform this into partial derivatives? (Arfken)

   3. Differential Equations

      Boundary condition 1D beam

   4. Topology and Analysis

      Completeness of a basis function

   5. Linear and Abstract Algebra

      Representation of elements of the Grassmannian space

   6. Differential Geometry

      Gradient vector without a metric

   7. Set Theory, Logic, Probability, Statistics

      Probability of n consecutive tails in n coin tosses

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Solution to Associate Legendre's Eq

6. Engineering

   1. General Engineering

      Motorcycle Airbox Physics

   2. Mechanical Engineering

      Acceleration of a car and jet plane problem

   3. Electrical Engineering

      Generator tripping on ground fault during load test

   4. Materials and Chemical Engineering

      Tire rubber durometer rating -- stability

   5. Nuclear Engineering

      Spheromak info

   6. DIY Projects

      Using ultrasound to create guitar effects

7. Other Sciences

   1. Chemistry

      Polypropylene question: "high heat tolerance"

   2. Programming and Computer Science

      Do programming trends just go in circles?

   3. Biology and Medical

      RAPD - close proximity of primers

   4. Computing and Technology

      Unopenable laptop

   5. Earth

      Ocean acidification and atmospheric carbon

8. The MC Square

   1. General Discussion

      How to ensure voter ballot integrity

   2. Science Fiction and Fantasy Media

      Are space fighters really impossible in realistic Sci Fi?

   3. Feedback and Announcements

      Possibility of PGN Display

   4. New Member Introductions

      New Member

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