1. Homework Help

   1. Introductory Physics Homework

      Number of waves from oscillating source in one period

   2. Advanced Physics Homework

      Bessel Function Zeros - To find Energy Levels

   3. Precalculus Mathematics Homework

      Doubt with geometry problem

   4. Calculus and Beyond Homework

      Basic Integration problem

   5. Biology, Chemistry and Earth Homework

      Boiling point and connection distance of the elements

   6. Engineering and Computer Science Homework

      5G Male

2. Science Education and Careers

   1. Science and Math Textbooks

      STEM Bibles List

   2. Academic Guidance

      physics degrees in the world?

   3. Educators and Teaching

      Theoretical Physics should belong in the math department

   4. Career Guidance

      Advice on next steps

3. Physics

   1. General Physics

      Kinetic energy and momentum in an elastic collision

   2. Classical Physics

      Why can't we apply Gauss's law to a circular disk?

   3. Quantum Physics

      Schrödinger's cat and gravity

   4. Special and General Relativity

      Is this way of understanding Minkowski correct?

   5. Atomic and Condensed Matter

      Noble gases with even nuclear spin form superfluids?

   6. High Energy, Nuclear, Particle Physics

      Conservation of Lepton and Baryon number

   7. Beyond the Standard Model

      What is new with Koide sum rules?

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      White dwarf collapses into a neutron star and Energy is released

   2. Cosmology

      Big Bang Singularity vs Black Hole Singularities

5. Mathematics

   1. General Math

      Basic Math Challenge - July 2018

   2. Calculus

      Differentiating under the integral sign

   3. Differential Equations

      Very simple question about KP hierarchy

   4. Topology and Analysis

      Uniqueness of tangent space at a point

   5. Linear and Abstract Algebra

      Number Line in Synthetic differential geometry

   6. Differential Geometry

      Penrose paragraph on Bundle Cross-section?

   7. Set Theory, Logic, Probability, Statistics

      Uncertainty of coefficients after a least square fit

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Mathematica quits frequently

6. Engineering

   1. General Engineering

      Lift Engine

   2. Mechanical Engineering

      The effect of a flywheel on a car's launch

   3. Electrical Engineering

      Converting impedence response to electrical conductivity

   4. Materials and Chemical Engineering

      Comsol-defining conditions

   5. Nuclear Engineering

      Zirconium in nuclear waste

   6. DIY Projects

      About a load calculation -- Roller selection for a plate straightining maching

7. Other Sciences

   1. Chemistry

      Stability Order of resonating structures

   2. Programming and Computer Science

      Controlling 100 LEDs with a PC?

   3. Biology and Medical

      Why do doctors assume pneumonia is bacterial?

   4. Computing and Technology

      Programmers are complicating the Web culture

   5. Earth

      Why is carbon dating not affected by atmospheric CO2 levels?

8. PF Lounge

   1. General Discussion

      Which music do you dislike the most?

   2. Science Fiction and Fantasy Media

      Alternative energy sources? How about photons?

   3. Feedback and Announcements

      Where to go?

   4. New Member Introductions

      New member

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