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 Requirement of Holonomic Constraints for Deriving Lagrange Equations
  • · Replies 1 ·
Replies
1
Views
1K
A Basic Question about Gauge Transformations
  • · Replies 12 ·
Replies
12
Views
2K
I Having trouble understanding Tensor Contraction
  • · Replies 14 ·
Replies
14
Views
2K
B Radio waves -- Tissue Refractive Index
  • · Replies 33 ·
2
Replies
33
Views
2K
B Circular wire center of gravity
  • · Replies 9 ·
Replies
9
Views
1K
I Question about the velocity of the center of mass reference frame
  • · Replies 21 ·
Replies
21
Views
2K
A F.E.M and Hamilton's Principle (converting differential equations into integral equations)
  • · Replies 1 ·
Replies
1
Views
1K
I Magnetic Flux - Misleading Definition or what?
  • · Replies 24 ·
Replies
24
Views
2K
I Does gas flow from low to high pressure?
  • · Replies 160 ·
6
Replies
160
Views
10K
I Mechanics problem: A Weight and a Mass Suspended from a String
  • · Replies 10 ·
Replies
10
Views
1K
B How are fractures in airplane structures detected by ultrasound?
  • · Replies 2 ·
Replies
2
Views
1K
I Galilean relativity for 2 frames
  • · Replies 52 ·
2
Replies
52
Views
4K
B What are complex numbers good for?
  • · Replies 13 ·
Replies
13
Views
2K
I Help to model transmission of forces through a medium
  • · Replies 12 ·
Replies
12
Views
1K
B What will be the ball's velocity after a perfectly elastic collision?
  • · Replies 4 ·
Replies
4
Views
1K
Why a mug handle gets very hot when microwaved
  • · Replies 25 ·
Replies
25
Views
16K
B Hydrostatic pressure on top of a cone filled with water
  • · Replies 24 ·
Replies
24
Views
2K
B [SOLVED] Regarding the Superposition of Two Plane Waves
  • · Replies 5 ·
Replies
5
Views
2K
Why is Hamilton's Principle assumed to be valid for non-holonomic systems?
  • · Replies 25 ·
Replies
25
Views
3K
I Calculating Force on a Golf Ball when Putting on a Level Green
  • · Replies 1 ·
Replies
1
Views
2K
B Jaan Kalda kinematics -- Radius of Curvature of a Cycloid
  • · Replies 6 ·
Replies
6
Views
2K
I What power rating do UV-A Tubes have? (tanning salons)
  • · Replies 10 ·
Replies
10
Views
2K
I Balloon experiment - Classical Physics vs. Statistical Physics
  • · Replies 16 ·
Replies
16
Views
2K
A Electrostatic interaction inside and outside the source
  • · Replies 1 ·
Replies
1
Views
1K
I Lagrangian doesn't change when adding total time derivative
  • · Replies 19 ·
Replies
19
Views
4K
A Confused about multipole expansion of vector potential
  • · Replies 4 ·
Replies
4
Views
1K
A If the solution of a field vanishes on-shell does it mean anything?
  • · Replies 1 ·
Replies
1
Views
802
I Hydrogen balloon experiment -- How high can it rise?
  • · Replies 22 ·
Replies
22
Views
2K
I Does the Hamilton-Jacobi equation exist for chaotic systems?
  • · Replies 4 ·
Replies
4
Views
1K
B How does Earth's rotation affect our movement?
  • · Replies 19 ·
Replies
19
Views
2K
I Why momentum is conserved when a gun fires? (conceptual question)
  • · Replies 4 ·
Replies
4
Views
2K
I Compressed air Pushing a Column of Water
  • · Replies 11 ·
Replies
11
Views
3K
B Is the Earth's gravitational pull constant?
  • · Replies 7 ·
Replies
7
Views
2K
I Longest day of the year is June 21 but longest daylight is June 26?
  • · Replies 4 ·
Replies
4
Views
2K
B Explaining Variations of Free-Fall Gravity on Earth?
  • · Replies 22 ·
Replies
22
Views
2K
A Can position and velocity vary independently in Hamilton's Principle?
  • · Replies 2 ·
Replies
2
Views
1K
I Error on a weighing scale due to wrong size
  • · Replies 4 ·
Replies
4
Views
1K
I How Does Landau Justify the Additivity of Lagrangians in Isolated Systems?
  • · Replies 9 ·
Replies
9
Views
2K
B Gas diffusion rates for methane into a vacuum versus into nitrogen
  • · Replies 19 ·
Replies
19
Views
1K
B Units of S/N ratio in some papers
  • · Replies 8 ·
Replies
8
Views
2K
I Using Linear Algebra to discover unknown Forces
  • · Replies 3 ·
Replies
3
Views
1K
B Exact differential and work done
  • · Replies 5 ·
Replies
5
Views
2K
B Can sunglasses fully protect against UV sensitivity?
  • · Replies 7 ·
Replies
7
Views
1K
I Change in Momentum from mass contribution to the moving object
  • · Replies 61 ·
3
Replies
61
Views
4K
I Does mass conservation correspond to a pseudo-symmetry?
  • · Replies 6 ·
Replies
6
Views
2K
A Why are the Navier-Stokes equations inconsistent in this case?
  • · Replies 18 ·
Replies
18
Views
2K
B Can a skateboarder ride faster by holding a water bottle?
  • · Replies 123 ·
5
Replies
123
Views
6K
B How would one draw reflected wavefronts?
  • · Replies 9 ·
Replies
9
Views
1K
B Why don't electrons leave a metal surface?
  • · Replies 28 ·
Replies
28
Views
2K
B Some questions about humidity and storing DVDs in a closed cardboard box
  • · Replies 3 ·
Replies
3
Views
1K
I Bead on a vertical frictionless ring
  • · Replies 20 ·
Replies
20
Views
2K
I A pendulum with viscous friction
  • · Replies 18 ·
Replies
18
Views
2K
I Mechanism of action of cooling from fans with misters
  • · Replies 2 ·
Replies
2
Views
2K
I Find the constant acceleration of an object that slows down to a standstill
  • · Replies 15 ·
Replies
15
Views
1K
I Best frequency of radio light to penetrate 1 meter of sea water?
  • · Replies 29 ·
Replies
29
Views
3K
B The Sun's Influence on the Moon's Orbit: Is it Negligible?
  • · Replies 4 ·
Replies
4
Views
3K
B Looking for help Understanding Inertia
  • · Replies 14 ·
Replies
14
Views
2K
I I need some support, please, for a gravity assist analysis
  • · Replies 86 ·
3
Replies
86
Views
8K
B Magnetic bottle is said to store hydrogen (and then convert into helium?)
  • · Replies 5 ·
Replies
5
Views
1K
B What is the total kinetic energy of the Earth relative to the Sun?
  • · Replies 40 ·
2
Replies
40
Views
4K
I Wondering how much thrust a drone propeller generates
  • · Replies 6 ·
Replies
6
Views
5K
I The Science Behind Rainbows: Explaining the Center of a Rainbow | Gooood Morning
  • · Replies 19 ·
Replies
19
Views
3K
I Switching polarizer and analyzer: the order matters -- why?
  • · Replies 4 ·
Replies
4
Views
2K
I Confused about applying the Euler–Lagrange equation
  • · Replies 3 ·
Replies
3
Views
1K
I Derivation of ideal gas heat capacity relationship
  • · Replies 6 ·
Replies
6
Views
2K
Research on HV to UHV vacuum gauge and controller build (Amateur scale)
  • · Replies 1 ·
Replies
1
Views
986
A Electric field vs coupling between transmission lines
  • · Replies 12 ·
Replies
12
Views
2K
I Is Hooke's law really not working, or is it me being dummy?
  • · Replies 13 ·
Replies
13
Views
2K
B How is an unstable object balanced?
  • · Replies 15 ·
Replies
15
Views
1K
I Is the energy destroyed in this experiment?
  • · Replies 15 ·
Replies
15
Views
2K
I Can angular motion exist outside of a gravity field?
  • · Replies 10 ·
Replies
10
Views
2K
B If gravity was a force wouldn't going back in time cause us to float?
  • · Replies 13 ·
Replies
13
Views
2K
B Any limit on how fast a Maglev can go?
  • · Replies 33 ·
2
Replies
33
Views
3K
B How will object's velocity change when a frictional force increases?
  • · Replies 16 ·
Replies
16
Views
2K
I Exit velocity through a nozzle: Bernoulli vs. Experience
  • · Replies 7 ·
Replies
7
Views
3K
B Elastic collision - should final velocities be asymmetric?
  • · Replies 17 ·
Replies
17
Views
2K
B Force transition through spring
  • · Replies 14 ·
Replies
14
Views
1K
I Moving Spacecraft propellent less?
  • · Replies 20 ·
Replies
20
Views
1K
I Parallel Capacitor safety at 10 micron plate spacing
  • · Replies 32 ·
2
Replies
32
Views
2K
A IR Laser diode focusing and module selection for CSEL Laser pointer
  • · Replies 6 ·
Replies
6
Views
1K
I DC current flows in a wire when two loops are brought close by?
  • · Replies 14 ·
Replies
14
Views
1K
B Things giving rise to static and dynamic coefficients of friction?
  • · Replies 44 ·
2
Replies
44
Views
2K
A What does it mean when the eom of a field is trivially satisfied?
  • · Replies 4 ·
Replies
4
Views
983
B Velocity of freefalling bodies after 1s, 2s, 3s, etc
  • · Replies 18 ·
Replies
18
Views
2K
I Drawback of dimensional analysis - motion in a resistive medium
  • · Replies 9 ·
Replies
9
Views
1K
B What is meant by "local melting"?
  • · Replies 11 ·
Replies
11
Views
1K
I Speed of Two Falling Ladders (Veritasium Video)
  • · Replies 19 ·
Replies
19
Views
5K
I Proving that the Lagrangian of a free particle is independent of q
  • · Replies 1 ·
Replies
1
Views
1K
I How Is Power Calculated in a Rotating System with Variable Speed?
  • · Replies 7 ·
Replies
7
Views
2K
B Maximum velocity for projectile motion?
  • · Replies 25 ·
Replies
25
Views
4K
I Prony brake calculation help (for determining engine horsepower)
  • · Replies 7 ·
Replies
7
Views
3K
I Fake water spin experiments around the equator
  • · Replies 6 ·
Replies
6
Views
4K
I Solving for Angular Velocity After a Disc Collision
  • · Replies 13 ·
Replies
13
Views
3K
B Electric Flux - confused about integrating over a tilted area
  • · Replies 8 ·
Replies
8
Views
2K
B Calculating non-dielectric reflectance without using complex numbers
  • · Replies 6 ·
Replies
6
Views
1K
I Gravity inside an exponential mass disk
  • · Replies 16 ·
Replies
16
Views
2K
B Why can't we calculate capacitive reactance like u/i?
  • · Replies 9 ·
Replies
9
Views
1K
I How to develop the rocket equation?
  • · Replies 47 ·
2
Replies
47
Views
4K
I Why isn't the Lagrangian invariant under ##\theta## rotations?
  • · Replies 5 ·
Replies
5
Views
2K
I Doubling Ionization of Tungsten: Effects on Energy?
  • · Replies 1 ·
Replies
1
Views
997