1. Homework Help

   1. Introductory Physics Homework

      What is the answer to this mcq question

   2. Advanced Physics Homework

      Quantum version of Larmor Precission

   3. Precalculus Mathematics Homework

      How do we solve this cubic equation

   4. Calculus and Beyond Homework

      Implicit differentiation problem

   5. Biology, Chemistry and Earth Homework

      -OH when used as -I effect and +I effect?

   6. Engineering and Computer Science Homework

      Combination circuit

2. Science Education and Careers

   1. Science and Math Textbooks

      Book about optimization problems

   2. Academic Guidance

      Preparation for university level physics

   3. Educators and Teaching

      Learning How To Teach

   4. Career Guidance

      Too early to panic about having no plan post-graduation?

3. Physics

   1. General Physics

      Looking for a cheap digital scale with accuracy <1 g

   2. Classical Physics

      What are non-inertial frames of reference?

   3. Quantum Physics

      How to shorten this speech about BH?

   4. Special and General Relativity

      What is the fastest time can go?

   5. Atomic and Condensed Matter

      Viscosity from DFT (VASP) using the Green-Kubo relation

   6. High Energy, Nuclear, Particle Physics

      Amplitude of Decay of mesons

   7. Beyond the Standard Model

      Summing not over configurations, but over theories

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      History question -- The choice of the North Pole being up or down

   2. Cosmology

      Antiparticles and Cosmology

5. Mathematics

   1. General Math

      Region of convergence of a Laplace transform

   2. Calculus

      Constrained variational problem

   3. Differential Equations

      Generalization of hypergeometric type differential equation

   4. Topology and Analysis

      Reshetikhin-Turaev Invariant of Manifolds

   5. Linear and Abstract Algebra

      What is orientation or shear transform collectively termed?

   6. Differential Geometry

      Properly embedded submanifold

   7. Set Theory, Logic, Probability, Statistics

      2 samples T test in case of non-normal distribution

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Trying to calculate an integral

6. Engineering

   1. General Engineering

      Compressed air, heat and pressure?

   2. Mechanical Engineering

      Centrifugal fans in parallel

   3. Electrical Engineering

      Best PCB pad finish for repeated solder jobs?

   4. Materials and Chemical Engineering

      Heterogeneities of the material properties

   5. Nuclear Engineering

      Is it correct to calculate the number of particles

   6. DIY Projects

      Using photos for project front panel labels/artwork

7. Other Sciences

   1. Chemistry

      Has anyone ever dealt with limescale in a bathroom sink?

   2. Programming and Computer Science

      Non-negative matrix factorization code

   3. Biology and Medical

      Psychology: The Stanford Prison Experiment was a Fraud

   4. Computing and Technology

      The best and secure password manager

   5. Earth

      May 2018 was Warmest in Recorded History

8. PF Lounge

   1. General Discussion

      Lame Jokes

   2. Science Fiction and Fantasy Media

      Reality check on SF action scenes

   3. Feedback and Announcements

      pf culture is toxic

   4. New Member Introductions

      hi there

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