1. Homework Help

   1. Introductory Physics Homework

      Calculate density at centre of the Sun

   2. Advanced Physics Homework

      Propagating degree of freedom (GR)

   3. Precalculus Mathematics Homework

      Angle between a plane and a line

   4. Calculus and Beyond Homework

      Integral Test

   5. Biology, Chemistry and Earth Homework

      Medication accumulation

   6. Engineering and Computer Science Homework

      Python. Simulation of the Solar System. Total energy

2. Science Education and Careers

   1. Science and Math Textbooks

      Mechanical Metallurgy by George Dieter

   2. Academic Guidance

      What books are good to learn the math in intro physics?

   3. Educators and Teaching

      Order of pre-college (high school) physics textbooks

   4. Career Guidance

      Chance of getting a teaching gig with just an MS?

3. Physics

   1. General Physics

      Electricity and electrons in the wire

   2. Classical Physics

      Bresse formula

   3. Quantum Physics

      Are there proposed physical processes for superposition

   4. Special and General Relativity

      Most accurate verification of gravity effect on time

   5. Atomic and Condensed Matter

      Calculation in Plasmons

   6. High Energy, Nuclear, Particle Physics

      Influence on Neutron spectrum due to energy loss of beam

   7. Beyond the Standard Model

      Quantization isn't fundamental

4. Astronomy and Cosmology

   1. Astronomy and Astrophysics

      Buy binoculars or telescope?

   2. Cosmology

      Dark matter and energy explained by negative mass

5. Mathematics

   1. General Math

      Why can't I reach every cell in a 3x3 square?

   2. Calculus

      Derivative of the area is the circumference -- generalization

   3. Differential Equations

      How to solve an ODE to find its solution

   4. Topology and Analysis

      Trying to understand why a set is both open and closed

   5. Linear and Abstract Algebra

      Proof of a simple concept , have i done this right?

   6. Differential Geometry

      Tangent spaces at different points

   7. Set Theory, Logic, Probability, Statistics

      Can this be called 'a coincidence'?

   8. MATLAB, Maple, Mathematica, LaTeX, Etc

      Problem with line integrals in Mathematica

6. Engineering

   1. General Engineering

      Balloon-lifted pressurized carbon fiber smokestack to carry chemicals into the upper atmosphere?

   2. Mechanical Engineering

      How effective is a pocket car window breaker?

   3. Electrical Engineering

      Induction motors

   4. Materials and Chemical Engineering

      Searching for a strong inflexible plastic that is transparent

   5. Nuclear Engineering

      Geiger (or other ionizing ray) Probe for Vacuum Conditions

   6. DIY Projects

      Lifting vehicles with 4 points of contact

7. Other Sciences

   1. Chemistry

      Is this another hydrogen vehicle scam?

   2. Programming and Computer Science

      How is PF's "CONTACT US" Button made?

   3. Biology and Medical

      Question about SETI.

   4. Computing and Technology

      Question on what I can do with tablets

   5. Earth

      2018-12-16 Another day of storms

8. Uncategorized Thought Field

   1. 2018 PF Member Award Polls

      Physics Award

   2. General Discussion

      Random Thoughts part 6

   3. Science Fiction and Fantasy Media

      Weapons of the future in Sci-Fi

   4. Feedback and Announcements

      2018 PF Member Awards Are Coming!

   5. New Member Introductions

      Hi everyone I'm new in Physics Forums

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