1. Homework Help

   1. Introductory Physics Homework

      Fractional uncertainty of g on the surface of the Sun

   2. Advanced Physics Homework

      Infinitely long molecular zipper

   3. Precalculus Mathematics Homework

      How do I find the value of n?

   4. Calculus and Beyond Homework

      Area under a curve-positive and negative area cancellation

   5. Biology, Chemistry and Earth Homework

      How to get moles from MO having % of mass?

   6. Engineering and Computer Science Homework

      3-link planar manipulator: a statics conceptual question

2. Science Education and Careers

   1. Science and Math Textbooks

      Motivating definitions from differential geometry

   2. Academic Guidance

      I need a bit of help (thesis submitted, lack of publications)

   3. Educators and Teaching

      How is physics knowledge used in everyday life?

   4. Career Guidance

      Jumping to engineering

3. Physics

   1. General Physics

      How to measure the distribution of weight across a solid object

   2. Classical Physics

      Thought Experiment from a Non-Physicist

   3. Quantum Physics

      Free particle: Quantum and Classical treatment

   4. Special and General Relativity

      Would a black hole whose density is lower than water sink?

   5. Atomic and Condensed Matter

      Doubly excited Atom of Helium

   6. High Energy, Nuclear, Particle Physics

      In the beginning, how did elementary particles form?.......

   7. Beyond the Standard Model

      Simple thought experiment merging GR and QT

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      NASA Parker Solar spacecraft question

   2. Cosmology

      How certain is dark matter?

5. Mathematics

   1. General Math

      What math is used the most in cosmology/astrophysics?

   2. Calculus

      Evaluating an integral issue

   3. Differential Equations

      solving PDE's with chebychev FFT

   4. Topology and Analysis

      Understanding the "branch cut argument"

   5. Linear and Abstract Algebra

      Forcing conditions in a solution of an under-determined system

   6. Differential Geometry

      Christoffel symbol and einstein summation convention

   7. Set Theory, Logic, Probability, Statistics

      The Drunkard's Walk: A Discussion of the Text

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Best fit line for data points

6. Engineering

   1. General Engineering

      Bridge Collapse Genoa - informed opinions invited

   2. Mechanical Engineering

      The right reason for lift force on an aerofoil

   3. Electrical Engineering

      Arcs in a microwave oven

   4. Materials and Chemical Engineering

      Mass and energy balance equations for a tank filled with H20

   5. Nuclear Engineering

      Can nuclear weapons destroy the world?

   6. DIY Projects

      Soldering steel

7. Other Sciences

   1. Chemistry

      When Cl, Br, I turn into Cl+, Br+ and I+?

   2. Programming and Computer Science

      Comparison of high-level computer programming languages

   3. Biology and Medical

      Atoms in a cell

   4. Computing and Technology

      One Step Closer to a Universal Quantum Computer

   5. Earth

      Getting the average of several typhoon trajectories

8. PF Lounge

   1. General Discussion

      A cure for gray hair is on the way?

   2. Science Fiction and Fantasy Media

      Upgrade and new good original Sci-Fi

   3. Feedback and Announcements

      PF Server Move

   4. New Member Introductions

      Introduction thread

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