Classical Physics Forum

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

Mechanics

I Is calling fictitious forces "not real" just about terminology?

Optics

I How do I stretch a laser from a beam into a sheet?

Thermodynamics

I What thermal cycle would describe the action of a candle carousel?

Electromagnetism

A Reflections at the source point of a transmission line
I Calculate acceleration from power/torque graphs
  • · Replies 17 ·
Replies
17
Views
554
  • Redirect
Local pressures in turbocharger housing?
  • · Replies – ·
Replies
–
Views
–
B Why higher speeds need more power if backward force is the same?
  • · Replies 35 ·
2
Replies
35
Views
751
B Rockets and power
  • · Replies 13 ·
Replies
13
Views
172
I Confusion about derivation of equation in Gregory
  • · Replies 5 ·
Replies
5
Views
277
I Different Definitions of The Quality Factor
  • · Replies 4 ·
Replies
4
Views
309
I The rocket equation, one more time
  • · Replies 41 ·
2
Replies
41
Views
1K
I Self Energy?
  • · Replies 18 ·
Replies
18
Views
948
I Varying resistance readings depending on how I connect my meter
  • · Replies 17 ·
Replies
17
Views
562
I Does a person's mass affect time?
  • · Replies 6 ·
Replies
6
Views
495
I A question about the origin of Coulomb's law and point charge divergence
  • · Replies 13 ·
Replies
13
Views
559
I Instantaneous electric field solved by extended electrodynamics?
  • · Replies 1 ·
Replies
1
Views
334
B 'splain this hydrostatic paradox in tiny words
  • · Replies 9 ·
Replies
9
Views
556
I Ampere-Maxwell law seems to contradict causality?
  • · Replies 3 ·
Replies
3
Views
391
A Please Explain Elementary Physics Elevator Question
  • · Replies 22 ·
Replies
22
Views
526
I Explain Bernoulli at the molecular level?
  • · Replies 252 ·
9
Replies
252
Views
8K
I Coulomb gauge implies instantaneous radial electric field?
  • · Replies 5 ·
Replies
5
Views
489
B The Effect of Linear and Rotational Motion on Measured Weight
  • · Replies 10 ·
Replies
10
Views
473
I Simple thought experiment with Stefan-Boltzmann law: energy
  • · Replies 7 ·
Replies
7
Views
502
I Does Poisson's equation hold due to vector potential cancellation?
  • · Replies 3 ·
Replies
3
Views
429
I Griffith, Electrodynamics, 4th Edition, Example 4.8. (First part)
  • · Replies 6 ·
Replies
6
Views
539
B A scenario of non-uniform circular motion
  • · Replies 4 ·
Replies
4
Views
340
I Gauss' law seems to imply instantaneous electric field propagation
  • · Replies 29 ·
Replies
29
Views
1K
I Recovering Hamilton's Equations from Poisson brackets
  • · Replies 2 ·
Replies
2
Views
370
I Do electron density waves accompany EM waves in coaxial cables?
  • · Replies 5 ·
Replies
5
Views
388
B Highway: Deriving speed from Doppler shift
  • · Replies 20 ·
Replies
20
Views
2K
I To predict the nature of Normal Reaction in any mechanics set-up
  • · Replies 10 ·
Replies
10
Views
1K
I What areas of maths and physics do I need to understand explosion physics?
  • · Replies 45 ·
2
Replies
45
Views
1K
A Advice for 100 MHz resonator
  • · Replies 11 ·
Replies
11
Views
582
I Off resonance driving of a MW/RF cavity
  • · Replies 9 ·
Replies
9
Views
429
B What qualities does time have other than linearity, motion, and speed?
  • · Replies 8 ·
Replies
8
Views
426
B Can Light Speed Be Increased by Straightening Its Wave Path?
  • · Replies 11 ·
Replies
11
Views
569
B Question about pressure of a liquid
  • · Replies 8 ·
Replies
8
Views
604
B Why is the 3 body problem unsolvable? And what will happen if someone solves it?
  • · Replies 26 ·
Replies
26
Views
871
I Relationship between nuclear magnetic physics and Maxwell's demon
  • · Replies 1 ·
Replies
1
Views
444
B Why is displacement the integral of acceleration with respect to time? [corrected in thread]
  • · Replies 4 ·
Replies
4
Views
475
I Feynman's derivation of average square distance variation in Brownian motion
  • · Replies 3 ·
Replies
3
Views
518
I Deriving the conformal Laplacian
  • · Replies 1 ·
Replies
1
Views
525
B Understanding Newton's Third Law and the Net Force on Objects
  • · Replies 10 ·
Replies
10
Views
581
B Work done when moving an object
  • · Replies 7 ·
Replies
7
Views
560
B Why Does a Spring Return to Its Original Position After Being Stretched?
  • · Replies 9 ·
Replies
9
Views
2K
B What is the Correct Reading on the Scale in This Mass/Scale Puzzle?
  • · Replies 206 ·
7
Replies
206
Views
5K
B Ultrasonic wave and regular sound wave
  • · Replies 4 ·
Replies
4
Views
663
A When should I analyze optical problems using ray tracing vs. wavefront analysis?
  • · Replies 12 ·
Replies
12
Views
707
I Topic about physics axioms, theory, laws etc..
  • · Replies 93 ·
4
Replies
93
Views
3K
B Why Does Hooke's Law Use a Negative Sign in Scalar Form?
  • · Replies 30 ·
2
Replies
30
Views
2K
I Is ##p^k = \partial L / \partial \dot{x}^k## true for all ##L##'s?
  • · Replies 2 ·
Replies
2
Views
572
B Which technique has been used? (drowning victim recovery in a lake)
  • · Replies 19 ·
Replies
19
Views
774
I Shielding behavior of a steel cuboid in a DC magnetic field
  • · Replies 1 ·
Replies
1
Views
593
I Reframing Light Bending Using Density Instead of Radius
  • · Replies 20 ·
Replies
20
Views
873
I Intuitive look at bending of light by gravity
  • · Replies 25 ·
Replies
25
Views
1K
I A "continous" gravitational field formula r=0 to infinity
  • · Replies 16 ·
Replies
16
Views
911
I Board Breaks: Small or Large Deflections?
  • · Replies 23 ·
Replies
23
Views
1K
I Visualising rotation in 3-D space
  • · Replies 9 ·
Replies
9
Views
867
B (Electric) current is not a vector quantity
  • · Replies 28 ·
Replies
28
Views
2K
B Use Surface-Volume to approximate gravity for planets and protons
  • · Replies 6 ·
Replies
6
Views
812
I Describe the Physics involved in swinging a rope to catch a cow
  • · Replies 6 ·
Replies
6
Views
680
B An explosion under a pile of timber and rocks
  • · Replies 2 ·
Replies
2
Views
689
I Color and appearance of a "pile" of biological viruses
  • · Replies 10 ·
Replies
10
Views
1K
I Boundary conditions for a wooden board used for breaking in martial arts
  • · Replies 20 ·
Replies
20
Views
859
I Explaining the magnetic (cable) paradox
  • · Replies 5 ·
Replies
5
Views
855
I Problem with light-ray construction
  • · Replies 4 ·
Replies
4
Views
837
I What does the Lattice Boltzmann Equation actually say?
  • · Replies 8 ·
Replies
8
Views
939
B EMF induced by Bar Magnet falling through a Coil
  • · Replies 3 ·
Replies
3
Views
841
I Does kinetic friction propel a person walking forward?
  • · Replies 41 ·
2
Replies
41
Views
2K
I Is Mechanical Energy Conservation Free of Ambiguity - follow up
  • · Replies 77 ·
3
Replies
77
Views
5K
B Slow Motion Appearance of Flags: Fluid Dynamics or Perceptual Illusion?
  • · Replies 7 ·
Replies
7
Views
921
B Why do sails on a boat generate lift perpendicular to the sails?
  • · Replies 9 ·
Replies
9
Views
1K
I Interception problem with curve (computer simulation)
  • · Replies 9 ·
Replies
9
Views
976
B Problems with modelling the vertical motion of a dust particle
  • · Replies 15 ·
Replies
15
Views
1K
B Deacceleration causes object to move backwards?
  • · Replies 10 ·
Replies
10
Views
1K
B Question about Newton's 3rd law: Two boxes sliding toward each other and colliding
  • · Replies 4 ·
Replies
4
Views
980
I Air flow between sphere/cylinder and membrane
  • · Replies 1 ·
Replies
1
Views
814
B The horizontal speed of an object does not affect the time it takes to fall vertically?
  • · Replies 22 ·
Replies
22
Views
2K
B What limits a rocket's max speed if in space drag is zero?
  • · Replies 68 ·
3
Replies
68
Views
8K
I A thought about visualizing space-time
  • · Replies 24 ·
Replies
24
Views
1K
B Inertia of a rolling dumbell
  • · Replies 2 ·
Replies
2
Views
928
I Permeability of Metglas and Propagation Velocity
  • · Replies 5 ·
Replies
5
Views
1K
B Symbol for temperature on the Fahrenheit scale
  • · Replies 13 ·
Replies
13
Views
1K
Is Velocity Increasing Below the X-Axis?
  • · Replies 17 ·
Replies
17
Views
1K
I Bose-Einstein statistics for μ>ε
  • · Replies 1 ·
Replies
1
Views
1K
I Problems with Blum's Karate Article
  • · Replies 1 ·
Replies
1
Views
1K
I Are 1D Longitudinal Waves Reflected at an Open End?
  • · Replies 11 ·
Replies
11
Views
1K
B Temperature-Dependence of Viscosity of a Fluid?
  • · Replies 1 ·
Replies
1
Views
1K
I Weird Depictions of Birefringence with Angle of Incidence 0°
  • · Replies 2 ·
Replies
2
Views
1K
I Questions about Jean-Rayleigh's derivation of Ultraviolet Catastrophe
  • · Replies 1 ·
Replies
1
Views
1K
B How Did Scientists Develop and Validate the Atomic Model?
  • · Replies 1 ·
Replies
1
Views
1K
First law of this universe
  • · Replies 25 ·
Replies
25
Views
2K
B Why Do Objects Bounce? Exploring Momentum and Energy Conservation
  • · Replies 6 ·
Replies
6
Views
2K
B How to use magnets in levitation?
  • · Replies 3 ·
Replies
3
Views
1K
B Would there be any varying forces acting on individual wells in rotation? (stir/shaker plate)
  • · Replies 9 ·
Replies
9
Views
1K
I Is there action at a distance at the atomic level in physics?
  • · Replies 8 ·
Replies
8
Views
1K
I Two kinds of pressure
  • · Replies 24 ·
Replies
24
Views
2K
I Creating White LEDs: Phosphor vs RGB
  • · Replies 5 ·
Replies
5
Views
2K
B Doubt regarding relative acceleration
  • · Replies 8 ·
Replies
8
Views
1K
I Solving a momentum problem where masses change after the collision
  • · Replies 35 ·
2
Replies
35
Views
3K
B Not sure about the magnetic flux (phi) depending on a cosine function
  • · Replies 9 ·
Replies
9
Views
1K
B Is water pressure on an inclined wall less than the weight of the water?
  • · Replies 31 ·
2
Replies
31
Views
2K
A Flaw in Lagrangian Mechanics for a rotary inverted pendulum system? (Simulation vs. Measured)
  • · Replies 11 ·
Replies
11
Views
2K
B Electric Field Direction: Are We Assuming a Universal Positive Frame?
  • · Replies 20 ·
Replies
20
Views
2K