1. Homework Help

   1. Introductory Physics Homework

      Balance reading when new object immersed in water

   2. Advanced Physics Homework

      Find the electric field of a point outside sphere

   3. Precalculus Mathematics Homework

      Is my proof by contradiction valid?

   4. Calculus and Beyond Homework

      Constructing a proof

   5. Biology, Chemistry and Earth Homework

      solution distribution on a strip

   6. Engineering and Computer Science Homework

      Parallel Mutual Inductances

2. Science Education and Careers

   1. Science and Math Textbooks

      Advanced condensed matter physics book

   2. Academic Guidance

      In search of motivation

   3. Educators and Teaching

      Thesis like a scientific article

   4. Career Guidance

      Anyone considering a career as a patent attorney?

3. Physics

   1. General Physics

      How are work and KE related?

   2. Classical Physics

      Standing waves on a string experiment -- Relative amplitude of harmonics

   3. Quantum Physics

      Does the Bell theorem assume reality?

   4. Special and General Relativity

      Allowed transformations in General Relativity

   5. Atomic and Condensed Matter

      Atomic Force Microscopy in hard and soft matter physics

   6. High Energy, Nuclear, Particle Physics

      Dead time in triggers

   7. Beyond the Standard Model

      Quantization isn't fundamental

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Exoplanets - Suspicious evidence and fantastical conclusions

   2. Cosmology

      Saddle and flat universe edges?

5. Mathematics

   1. General Math

      How would I write this trig solution?

   2. Calculus

      Questions regarding polynomial divisions and their roots

   3. Differential Equations

      Non_linear Pendulum

   4. Topology and Analysis

      How to think of S1 (circle) abstractly

   5. Linear and Abstract Algebra

      Why the hate on determinants?

   6. Differential Geometry

      Component derivative of a tensor

   7. Set Theory, Logic, Probability, Statistics

      Why does information need probability?

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      WolframAlpha: How to plot a family of curves?

6. Engineering

   1. General Engineering

      Example of a technology that was long underestimated?

   2. Mechanical Engineering

      Most efficient convergent nozzle

   3. Electrical Engineering

      Microhydro project, transmission line loss

   4. Materials and Chemical Engineering

      Stainless steel 304 "Stainless" properties

   5. Nuclear Engineering

      Struggling to understand cell cards in MCNP

   6. DIY Projects

      What kind of projects can I do at home?

7. Other Sciences

   1. Chemistry

      CO2 [ppm] exposure relative to room volume [m^3] and air ventilation

   2. Programming and Computer Science

      More cool automatic differentiation (Hamiltonian)

   3. Biology and Medical

      Cancer risk after CT scan

   4. Computing and Technology

      The best and most secure password manager

   5. Earth

      Global Ice melt and heat balance

8. Lounge at the End of the Universe

   1. General Discussion

      VOTE PF Photo Contest - Parallel Lines

   2. Science Fiction and Fantasy Media

      Aliens as depicted in movies

   3. Feedback and Announcements

      Multiquote Failure

   4. New Member Introductions

      Hi its Jappy

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