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Undergrad Does the scale factor need to be normalized?
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3
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2K
Intro Math Learning Mathematical Problem Solving
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16
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788
Alien life, probabilities, and interstellar propagation of human life
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8
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237
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5K
Undergrad Light clock treating horizontal and vertical motion differently?
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27
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436
Undergrad Linear vs rotary motion
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11
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388
Undergrad Why is water pressure increased in a plastic bag in a bucket?
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2
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59
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1K
High School How much lower would a sheep be expected to jump if on a steep upward slope?
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2
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32
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546
Why Is Fan Suction/Intake So Weak Compared to Exhaust?
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16
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1K
Convert Circular motion into figure-8 shaped loop
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11
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574
Random Photos
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115
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166K
Collection of Lame Jokes
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790
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24K
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2M
Wordle Lovers - Play the NYT Daily Game
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271
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245K
Plumbing How do I fix the gap around bathtub faucet?
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2
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136
The Secrets of Prof. Verschure's Rosetta Stones
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5
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141
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29K
Can a flow created by a fan show an Edge effect when hitting a wall?
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844
Praise 2025 PF Member Awards Ceremony
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23
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2K
A mechanical problem with complicated geometry
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5
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333
Undergrad A variant of the Monty Hall problem
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9
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3K
Some Realistic AI Animations That I Like
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4
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277
Undergrad "Alien objects", Stillwell's "Reverse Mathematics"
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0
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64
Undergrad Is a half submerged object submerged in its own displaced water?
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13
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423
Undergrad 2 interpretations of bra-ket expression: equal, & isomorphic, but...
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8
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395
Zeroth Law of Thermodynamics
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5
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382
Graduate Some derivation in QFT in Curved SpaceTime by Birrell and Davies
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2
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245
ChatGPT Examples, Good and Bad
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  • Sticky
Space Stuff and Launch Info
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53
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169K
New Sci-Fi Writer enthusiast joining from a Gemini recommendation
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9
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319
Definite integral involving rational function and 𝜋
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1
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120
Music Talent Worthy of Wider Recognition
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4
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118
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10K
Music Cover songs versus the original track, which ones are better?
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78
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2K
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108K
Tone Bending On Synthesizers
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2
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284
How do I derive an expression for the velocity vector for any α?
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26
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902
News Weird News Compilation
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71
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158K
Graduate How to fix Relativistic QM so it's consistent?
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26
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2K
Graduate Hopf fibration of 3-sphere
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2
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36
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2K
Programming Jokes: Lame, Science & Math Jokes!
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16
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36K
High School The parallel axiom, Stillwell's "Reverse Mathematics"
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16
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579
High School True static equilibrium and effects on time
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2
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High School Pumping water upwards into a large water tank
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6
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2K
Mathematical definition of a rigid body
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23
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747
Undergrad Blueshift in case of the Big Crunch scenario
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9
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281
  • Sticky
Our Beautiful Universe - Photos and Videos
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80
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My name is promise Chibuike, am a graduate of chemical Engineering
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110
Do light bulbs store energy?
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14
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426
How far will we let AI control us?
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4
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Undergrad Are Boltzmann brains predicted by our current cosmological theories?
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484
Physics How to close the gap: From Independent Research to Academic Discourse
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2
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53
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3K
Music Who is your favorite Jazz musician and what is your favorite song?
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12
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330
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24K
Difficulty understanding the reasoning behind constraint equations in mechanical systems
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13
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290
Graduate Understanding Barandes' microscopic theory of causality
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12
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337
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15K
Undergrad The imaginary part of the wave function
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7
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High School Car spinning on a frictionless sheet of ice = absolute motion?
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15
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1K
Music Perfect Rhythm
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2
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289
There are people in biology who really do math
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9
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1K
No freewill?
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5
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146
RIP Scott Adams
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152
Some thoughts about self-education
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2
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37
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9K
How to get peers to review your work?
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12
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262
Graduate Open problems and suggestions of great mathematical journals
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10
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2K
Fukushima Japan Earthquake: nuclear plants Fukushima part 2
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60
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456K
Why must residential electrical systems be connected to Earth (soil)?
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2
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40
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2K
Why is it not allowed to question General Relativity?
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19
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314
Solvents for cleaning soap film?
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7
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307
Graduate What is new with Koide sum rules?
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11
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Graduate The wrong turn of string theory: our world is SUSY at low energies
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12
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High School Electric Fields inside Conductors & Gauss' Law
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6
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390
Chemistry Understanding Reaction Quotient and Molarity
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7
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667
Distinguishing Mathematical Consistency from Physical Realizability
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11
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799
Intro Math Recommendations for Math book series for preschool onward
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18
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2K
Undergrad Understanding permutations and combinations in a coin toss experiment
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6
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891
Analysis Need Self study book for Fourier Series and Generalized Functions
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7
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230
Undergrad Unexpected findings in need of an explanation (retrograde motion of Mars)
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3
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Graduate Consistency of Relativistic QM
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2
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233
What is the fourth dimensional equivalent of volume?
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5
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195
A few questions about RCD
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14
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780
Undergrad Scattering Theory: Difference between use of scattering amplitude and Born approximation?
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0
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168
Electric potential due to shell containing a charge at an offset outside
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5
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536
Pluribus
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0
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196
Intro Physics I need help to pick a physics book (AP Physics 1, algebra based and beyond)
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10
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2K
Hi everyone
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9
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742
Undergrad Vector calculus: line element dr in cylindrical coordinates
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13
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3K
Tungsten Cubes for STEM Education — Looking for Feedback
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2
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491
Tusi couple
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0
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221
Undergrad How can a multiple conjunction occur during a retrograde motion?
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0
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169
Calculators How does multiplication with 2's complement work?
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1
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223
MATLAB MATLAB GPU Cross-Correlation Code Fails with OOM on 8 GB Supercomputer
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4
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589
Graduate Trivial fiber bundle vs product space
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20
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611
Collection of Science Jokes P2
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136
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4K
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448K
Machining Aerogel
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6
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708
Random Thoughts 7
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66
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63K
Rock and Roll Keyboard Players
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2
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30
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1K
Today I Learned
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229
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469K
Favorite Mashups - All Your Favorites in One Place
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3
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9K
Bob Weir died at 78
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3
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309
Undergrad What keeps dark matter in galactic halos?
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28
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4K
Undergrad Rotation curve in spiral galaxy velocity and uniform velocity dispersion
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4
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1K
Physics Career Prospects (outside of academia)
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14
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4K
Conductor with high electron mobility (mean free path)
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1
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244
Engineering Enumeration vs Bisection Strategy
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2
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487
High School Can gravitons be detected?
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2
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36
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3K