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Join expert classical physics discussion on the principles developed before the rise of relativity and quantum mechanics. Including mechanics, electrodynamics, thermodynamics, optics.

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Mechanics

A Toy Model of Atmospheric Geophysics
27.6K threads
Undergrad A Toy Model of Atmospheric Geophysics

Optics

Question about computing diffraction patterns
8.2K threads
High School Question about computing diffraction patterns

Thermodynamics

Musing on the Foundations of Statistical Mechanics
7.4K threads
Graduate Musing on the Foundations of Statistical Mechanics

Electromagnetism

A magnetostatics problem of interest 2
16.3K threads
Graduate A magnetostatics problem of interest 2
High School Question about a physical entity (dimensional analysis)
  • simplemind
  • · Replies 9 ·
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9
Undergrad Method for experimental results analysis
  • miraboreasu
  • · Replies 4 ·
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4
High School If I double sound on my PC, how would the sound intensity increase?
  • Lotto
  • · Replies 10 ·
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10
High School How to calculate a random measurement error?
  • Lotto
  • · Replies 3 ·
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3
Undergrad Why is there no frost below a certain temperature?
  • gary350
  • · Replies 4 ·
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4
Undergrad Why is length considered a fundamental (base) quantity?
  • Ahsan Khan
  • · Replies 38 ·
2
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38
High School How does a bathtub/shower diverter valve work?
  • barryj
  • · Replies 8 ·
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8
High School Causation: substance or event?
  • sayetsu
  • · Replies 4 ·
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4
Undergrad Question about Waves -- "frequency" versus "angular frequency"
  • sinus
  • · Replies 4 ·
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4
Undergrad I'm confused on which equation gives percentage uncertainty
  • homeworkhelpls
  • · Replies 7 ·
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7
Undergrad About Bernoulli's equation for fluid flow
  • samy4408
  • · Replies 6 ·
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6
High School Understanding the Doppler Effect at an Angle
  • abdossamad2003
  • · Replies 1 ·
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1
Undergrad I found 2 formulas about surface tension -- which one is correct?
  • samy4408
  • · Replies 3 ·
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3
High School Question about inductive and deductive arguments in science
  • Chenkel
  • · Replies 34 ·
2
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34
High School Rice Field Bubbles: Gotcha! Why?
  • Hornbein
  • · Replies 14 ·
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14
Undergrad Question about elasticity to help my understanding
  • samy4408
  • · Replies 2 ·
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2
Undergrad Brownian motion of charged particles?
  • Suekdccia
  • · Replies 8 ·
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8
Graduate How Can Skeletal Models and Physics Help Us Understand Pain Perception?
  • Grn_Model_Maker
  • · Replies 2 ·
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2
Undergrad What Causes the Initial Acceleration Phase in Molecular Behavior?
  • ndvcxk123
  • · Replies 7 ·
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7
High School Why doesn't helium have any effect on the sound of my voice?
  • Vincentjacobprice
  • · Replies 27 ·
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27
High School How and why can multiplication combine physical quantities?
  • Haris045
  • · Replies 8 ·
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8
Undergrad Number of Sig Figures and Precision
  • fog37
  • · Replies 20 ·
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20
Undergrad Can Magnets Provide Infinite Energy for Weight Training?
  • yungman
  • · Replies 16 ·
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16
Undergrad Understanding Sound Waves in Fluids: Pressure and Velocity Fields
  • Delta2
  • · Replies 6 ·
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6
Undergrad Electromagnetic effects in the brain
  • Arceus
  • · Replies 1 ·
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1
Undergrad Does gravitational energy travel like electrical energy?
  • Orthoceras
  • · Replies 1 ·
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1
Undergrad Does dividing maximum frequency by sound frequency give accurate velocity?
  • Chenkel
  • · Replies 17 ·
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17
Undergrad What is the Order of Integration in a Double Integral?
  • Chenkel
  • · Replies 7 ·
Replies
7
High School Swimming at the Same Reynolds Number as Sperm: A Reflection on Purcell's Talk
  • ergospherical
  • · Replies 1 ·
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1
Graduate Why do we assume harmonic time dependence in wave equation solutions?
  • Enjolras1789
  • · Replies 2 ·
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2
High School A flip of the Earth on its axis
  • arydberg
  • · Replies 32 ·
2
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32
Undergrad Which units is this conversion factor for (molar volume)? 0.023901488
  • bumblebee77
  • · Replies 16 ·
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16
Undergrad Formula for Doppler effect in moving medium?
  • xxxyyy
  • · Replies 16 ·
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16
Undergrad Gas molecular attraction in the sense of Newton's law
  • Bernadette
  • · Replies 4 ·
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4
High School Why is sea surface water relatively constant?
  • jaumzaum
  • · Replies 3 ·
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3
Undergrad Converting Units: How to Convert 1.6*10^7 N/cm^2 to kg/cm^2
  • kasnay
  • · Replies 13 ·
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13
Undergrad Physics behind making a mango milk shake
  • starpower1824
  • · Replies 2 ·
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2
Undergrad Question about X-ray power emitted by the Coolidge tube
  • samy4408
  • · Replies 2 ·
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2
High School Artificial gravity rotating on two axes
  • DaveC426913
  • · Replies 76 ·
3
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76
Undergrad Does high humidity air transfer sound better than dry air?
  • gary350
  • · Replies 1 ·
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1
Undergrad When is a water surface not dispersive?
  • Daniel Petka
  • · Replies 1 ·
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1
Undergrad An interesting question from Veritasium on YouTube
  • Swamp Thing
  • · Replies 151 ·
6
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151
Undergrad Acoustic wave properties and momentum
  • mohamed_a
  • · Replies 8 ·
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8
Graduate Resonant frequencies of liquid in a cylinder
  • member 428835
  • · Replies 14 ·
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14
Graduate Brownian Motion (Langevin equation) correlation function
  • Tim667
  • · Replies 2 ·
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2
Undergrad Estimating Vertical Wind Speeds: T_a, T_s, & P_a
  • jones1234
  • · Replies 2 ·
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2
Undergrad Shallow Water Wave Equation Simulation: Reverse Shoaling?
  • person123
  • · Replies 1 ·
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1
Undergrad How to deal with these +- values in an equation?
  • Martyn Arthur
  • · Replies 9 ·
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9
High School Does there exist a metal that is 100% unrustable?
  • LightningInAJar
  • · Replies 11 ·
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11
Undergrad Humming Top Acoustics: Unearthing the Mystery
  • Anachronist
  • · Replies 4 ·
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4
Undergrad Surface tension and water (the smallest hole water will flow through)
  • LT72884
  • · Replies 1 ·
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1
Undergrad Sound Frequency & Pipe Wall Thickness
  • Daimion
  • · Replies 5 ·
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5
Undergrad Possibility of PCB Oils in old Diffusion Pumps?
  • jasonlee112
  • · Replies 11 ·
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11
High School Fundamental Units and Supplementary Units — What are the differences?
  • Mr X
  • · Replies 28 ·
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28
Undergrad Changing the tone of a wind chime using slits or cuts
  • twincam
  • · Replies 8 ·
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8
High School Does Gaining Weight Affect Mass?
  • Darrencc
  • · Replies 21 ·
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21
Undergrad Can ground albedo near a highway refract noise upward?
  • Mike S.
  • · Replies 14 ·
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14
Undergrad Projector location in Cinema Theater
  • akerkarprashant
  • · Replies 2 ·
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2
Undergrad Open channel flow: derive function for energy slope on friction?
  • MrS
  • · Replies 1 ·
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1
Undergrad Maximizing Compound Bow Power: The Role of Longer Limbs Explained
  • kingofjong
  • · Replies 1 ·
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1
Undergrad Uncertainty in measurements of the thickness of a pile of pellets
  • nuclearsneke
  • · Replies 3 ·
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3
High School Is the Definition of a Standing Wave Accurate?
  • kasheee
  • · Replies 19 ·
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19
Undergrad Conversion factors derivation.
  • akerkarprashant
  • · Replies 1 ·
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1
High School Stability of Droplet Climbing on a Needle with Varying Contact Angle
  • chingel
  • · Replies 2 ·
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2
Graduate Calculating the mechanical index of applied ultrasound
  • rwooduk
  • · Replies 4 ·
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4
Undergrad Calculating an increasing angle in Spherical Coordinates for a curve
  • Peter-
  • · Replies 21 ·
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21
Undergrad Can Graphite Sheets Replace Carbon-Loaded Teflon in Millimeter Wave Dosimeters?
  • cuallito
  • · Replies 1 ·
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1
Graduate Betz Law & Submerged Turbines: Is it Applicable?
  • aladinlamp
  • · Replies 9 ·
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9
Undergrad Geometric Interpretation of Turbulence
  • George444fg
  • · Replies 13 ·
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13
Undergrad General physics question -- How can massless photons have momentum?
  • spacecadet11
  • · Replies 9 ·
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9
Undergrad Explain how soil is not frozen after 3 weeks of below freezing weather
  • gary350
  • · Replies 15 ·
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15
Undergrad Second Tonga shockwave - why a drop in the pressure?
  • Borek
  • · Replies 47 ·
2
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47
High School A doubt regarding vectors, scalars and their role in physics
  • JackFyre
  • · Replies 4 ·
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4
Graduate Is fluid mechanics (aerodynamics) still being discovered?
  • Jurgen M
  • · Replies 17 ·
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17
Undergrad Equivalent formula for a Sound wave in a medium like an EM wave
  • chowdhury
  • · Replies 5 ·
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5
Undergrad Resonant Frequency Formula for a given object
  • btb4198
  • · Replies 2 ·
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2
Graduate Does gravity affect Brownian Motion?
  • dedocta
  • · Replies 3 ·
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3
High School What type of wave is described by y'' = -k*y^2
  • jaydnul
  • · Replies 15 ·
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15
High School White noise frequencies and Audio Speakers
  • arivel
  • · Replies 25 ·
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25
Undergrad Help Designing a Resonance Box for Tuning Forks
  • KedarMhaswade
  • · Replies 1 ·
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1
High School Thought experiment (debate with friend)
  • Joe seki
  • · Replies 9 ·
Replies
9
Undergrad What Specifications Are Needed for a Plasma Device Power Supply?
  • naviakam
  • · Replies 24 ·
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24
Undergrad What is the orgin of Gauss' law?
  • feynman1
  • · Replies 7 ·
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7
Undergrad Classical particle in a Penning trap
  • kelly0303
  • · Replies 8 ·
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8
High School Creep and its effects on a material
  • Aurelius120
  • · Replies 1 ·
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1
Undergrad What Are the Uncommon Coordinate Systems in Physics Beyond the Basics?
  • Falgun
  • · Replies 16 ·
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16
Undergrad Color Theory - What does blue + yellow make?
  • jaumzaum
  • · Replies 21 ·
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21
Undergrad What is the role of frequency in music?
  • Pattern-chaser
  • · Replies 12 ·
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12
Undergrad How is the popular estimate of the Earth's atmospheric mass correct?
  • Dreksler
  • · Replies 8 ·
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8
Undergrad Micro Sound Waves: Can 1 Hear What Only Another Can?
  • LightningInAJar
  • · Replies 6 ·
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6
High School Fundamental Questions about Atoms
  • Sciencelad2798
  • · Replies 2 ·
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2
Undergrad Sound and apparent wind -- Any Doppler effect?
  • Kairos
  • · Replies 13 ·
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13
Undergrad Are Newton's Laws of physics compatible with thermodynamics?
  • Thytanium
  • · Replies 6 ·
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6
Undergrad How does sound reflect from an interface at an angle?
  • snorkack
  • · Replies 17 ·
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17
Undergrad How Does Surface Tension Balance Small Objects on Water Surface?
  • Dario56
  • · Replies 5 ·
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5
Undergrad Du Nouy Method for Measurement of Surface Tension
  • Dario56
  • · Replies 23 ·
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23
Undergrad Can We See the Moon From 238,900 Miles Away?
  • gary350
  • · Replies 5 ·
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5
Graduate Free boundary conditions on vibrating rectangular membranes
  • abilolado
  • · Replies 20 ·
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20
Undergrad Escape of Hydrogen from the Earth's Atmosphere
  • MartinG
  • · Replies 15 ·
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15
Undergrad Behavior of a curved 2D sheet and a curved 1D wire under acoustic wave
  • Seanskahn
  • · Replies 3 ·
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3