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
Why Electromagnetic Waves are Transverse
  • · Replies 2 ·
Replies
2
Views
2K
Gradient of scalar function discontinuous on boundary
  • · Replies 1 ·
Replies
1
Views
2K
Defensive Driving: Reduce Impact Force in Collision
  • · Replies 5 ·
Replies
5
Views
3K
Mythbusters: Blow your own sail review
  • · Replies 40 ·
2
Replies
40
Views
42K
Physics Simulation: Calculating Gravitational Force between Earth and Sun
  • · Replies 6 ·
Replies
6
Views
9K
What Causes the Skin Effect in High Frequency Currents?
  • · Replies 9 ·
Replies
9
Views
9K
What causes the shadow below a whirlpool in a pool?
  • · Replies 1 ·
Replies
1
Views
3K
Gauss law for gravitational fields
  • · Replies 8 ·
Replies
8
Views
5K
Energy to escape gravitational pull
  • · Replies 24 ·
Replies
24
Views
6K
How does a 'open surface' of a closed loop look like?
  • · Replies 1 ·
Replies
1
Views
3K
Verify Laplace equation in rectangular coordinates.
  • · Replies 4 ·
Replies
4
Views
3K
Forces needed to move a sliding door, from the physicsly challenged
  • · Replies 1 ·
Replies
1
Views
4K
What are the physics behind flying discs and disc golf?
  • · Replies 2 ·
Replies
2
Views
2K
The Tilting Glass: Understanding the Dynamics
  • · Replies 4 ·
Replies
4
Views
3K
Optimal Performance of a Water Molecule Vessel in Ocean Conditions
  • · Replies 8 ·
Replies
8
Views
2K
Understanding Eq. 2.18 & Eq. 2.5 in Jackson's ED Book
  • · Replies 2 ·
Replies
2
Views
2K
Gravitational force between everyday objects
  • · Replies 4 ·
Replies
4
Views
5K
What Causes Gravity? Insulation & Density Explained
  • · Replies 3 ·
Replies
3
Views
3K
The Ultimate Performance of the Infinite Conundrum Rifle
  • · Replies 6 ·
Replies
6
Views
3K
Inverse perspective mapping equations
  • · Replies 4 ·
Replies
4
Views
6K
E & B Fields from Moving Charges: The Magnetic Monopole Mystery
  • · Replies 3 ·
Replies
3
Views
2K
Question about Forces and Couples
  • · Replies 1 ·
Replies
1
Views
2K
Question about System of Forces
  • · Replies 2 ·
Replies
2
Views
1K
EM field of dipole derivation from Green's function
  • · Replies 4 ·
Replies
4
Views
8K
If I connect the +ve terminal of one battery to a terminal of a bulb
  • · Replies 10 ·
Replies
10
Views
3K
What causes an object to eventually come to rest after bouncing indefinitely?
  • · Replies 4 ·
Replies
4
Views
2K
Securing a 3D Frame: How to Analyze and Solve for Loads?
  • · Replies 6 ·
Replies
6
Views
2K
Derivation of expression for force
  • · Replies 3 ·
Replies
3
Views
7K
Back of the envelope derivation of Larmor's equation
  • · Replies 6 ·
Replies
6
Views
7K
I once came across a Wikipedia page describing a system where
  • · Replies 2 ·
Replies
2
Views
2K
Why does the colour wheel exist?
  • · Replies 66 ·
3
Replies
66
Views
14K
Measuring Inductance Value of Handmade Inductor
  • · Replies 3 ·
Replies
3
Views
3K
Recurve vs Longbow: Stored Energy & Arrow Velocity
  • · Replies 9 ·
Replies
9
Views
43K
Convertion between MHz and Ångström
  • · Replies 3 ·
Replies
3
Views
7K
What is Shear in Materials Science?
  • · Replies 1 ·
Replies
1
Views
1K
Continuum limit: is it really justifiable?
  • · Replies 4 ·
Replies
4
Views
8K
How could one measure degree of coherence with Fresnel birprism?
  • · Replies 1 ·
Replies
1
Views
3K
Flow rate relation with height
  • · Replies 2 ·
Replies
2
Views
7K
Why Do Objects Appear As We See Them?
  • · Replies 5 ·
Replies
5
Views
2K
Euler-Lagrange equation derivation
  • · Replies 4 ·
Replies
4
Views
4K
Confused with the principles in Vector Moments - with Pictures
  • · Replies 1 ·
Replies
1
Views
2K
Where does the force come from?
  • · Replies 1 ·
Replies
1
Views
2K
How 2 Notes Combine on Piano Keyboard
  • · Replies 39 ·
2
Replies
39
Views
7K
I was just wondering if there is any formal proof that two
  • · Replies 4 ·
Replies
4
Views
2K
How can energy lost due to expansion be minimized in heat engines and ships?
  • · Replies 2 ·
Replies
2
Views
2K
How do I derive the step on the formula of distance of source to field point.
  • · Replies 10 ·
Replies
10
Views
2K
Scientists Discuss Mysteries of Vacuums
  • · Replies 4 ·
Replies
4
Views
2K
Freezing Liquid with Compressed Nitrogen - Is it Possible?
  • · Replies 1 ·
Replies
1
Views
2K
What is a Quasi-Conductor and How Does it Affect Vehicle Ignition Failure?
  • · Replies 2 ·
Replies
2
Views
9K
Potential Difference Between 12V Battery Terminals
  • · Replies 3 ·
Replies
3
Views
2K
Calculating a vector from a known angle and a known vector
  • · Replies 10 ·
Replies
10
Views
3K
Does close systems really exist?
  • · Replies 17 ·
Replies
17
Views
9K
Induced charg by chagr distribution
  • · Replies 3 ·
Replies
3
Views
2K
Parallel axis theorem, cube (Confirm)
  • · Replies 1 ·
Replies
1
Views
2K
Physics of tubing behind a boat.
  • · Replies 1 ·
Replies
1
Views
12K
Waveguides, cavities and circuits
  • · Replies 5 ·
Replies
5
Views
3K
Are Colors Connected to Energy and Infrared Vision?
  • · Replies 23 ·
Replies
23
Views
4K
3D statics - is there a simpler, shorter way to solve problems?
  • · Replies 7 ·
Replies
7
Views
8K
Learn About Harmonic Oscillator - Beginner Physics Guide
  • · Replies 2 ·
Replies
2
Views
2K
Density and the ideal gas equation
  • · Replies 2 ·
Replies
2
Views
3K
Solve World Physics Olympiad (WOPHO) Problems Together
  • · Replies 9 ·
Replies
9
Views
5K
What do I see if I walk forward through a superdense transparent medium?
  • · Replies 6 ·
Replies
6
Views
2K
Equivalence Principle precision
  • · Replies 2 ·
Replies
2
Views
2K
Cancellation of Poynting vector components
  • · Replies 2 ·
Replies
2
Views
7K
Which Burns More? Water or Steam at 100°C
  • · Replies 3 ·
Replies
3
Views
2K
Where is the Phase Diagram for X and XDot?
  • · Replies 2 ·
Replies
2
Views
2K
Using Forces vs. Energy Formulas: Which is Better?
  • · Replies 8 ·
Replies
8
Views
3K
Help UFRJ (Brazillian college) physics exam
  • · Replies 1 ·
Replies
1
Views
2K
Why Do Many Physical Phenomena Exhibit Wave Behavior?
  • · Replies 37 ·
2
Replies
37
Views
7K
Rate of emission from a black body
  • · Replies 2 ·
Replies
2
Views
2K
Calculating Magnetic Field of Square Loop: Questions Answered!
  • · Replies 3 ·
Replies
3
Views
2K
This is perhaps more a maths question, but it's about a piece of maths
  • · Replies 21 ·
Replies
21
Views
5K
Do all bodies radiate at all frequencies?
  • · Replies 2 ·
Replies
2
Views
2K
Clarification on curl and divergence in cylindrical and spherical coordinates.
  • · Replies 17 ·
Replies
17
Views
11K
Is Buoyancy Different on Other Planets Due to Changes in Gravity?
  • · Replies 5 ·
Replies
5
Views
6K
What should the normalization condition be for an energy distribution function?
  • · Replies 4 ·
Replies
4
Views
3K
Skin depth of zero thickness in DC circuits
  • · Replies 3 ·
Replies
3
Views
5K
Inverse square law and infinite intensity
  • · Replies 5 ·
Replies
5
Views
4K
Fluids (Through an IV) Question
  • · Replies 77 ·
3
Replies
77
Views
21K
Converting Lumens to Joules for 1cm Plastic/Glass Sphere
  • · Replies 1 ·
Replies
1
Views
4K
Mechenical method to produce preodic cycles
  • · Replies 6 ·
Replies
6
Views
2K
Can Solenoids Enhance Railgun Performance?
  • · Replies 4 ·
Replies
4
Views
6K
Which shock is dangerous: 1.High V &Low I. 2.Low V & high I.
  • · Replies 24 ·
Replies
24
Views
5K
Self-Diffusion, two versions of mean square displacement
  • · Replies 1 ·
Replies
1
Views
3K
Solving the Mystery of 3D Mechanics: Is the Sum of Moments 0?
  • · Replies 5 ·
Replies
5
Views
4K
Principle of Least Action - not always valid?
  • · Replies 1 ·
Replies
1
Views
3K
How are experiments affected when gravity's changed, compared to Earth?
  • · Replies 1 ·
Replies
1
Views
3K
Smallest radius a flywheel can be and still provide enough energy
  • · Replies 3 ·
Replies
3
Views
4K
Why is force inversely proportional to distance?
  • · Replies 10 ·
Replies
10
Views
12K
Using only intuition, about a locked thread
  • · Replies 21 ·
Replies
21
Views
3K
Physics: Potential Energy Beyond Earth's Surface
  • · Replies 11 ·
Replies
11
Views
3K
Geothermal Energy: Drilling to Magma from Platforms at Sea
  • · Replies 9 ·
Replies
9
Views
2K
Poisson Brackets / Levi-Civita Expansion
  • · Replies 3 ·
Replies
3
Views
4K
Confussion about Del operator for field point vs source point.
  • · Replies 2 ·
Replies
2
Views
5K
Calculate Velocities and Volume Flow Rate?
  • · Replies 1 ·
Replies
1
Views
3K
Real Gas PV Curve: Volume Explained
  • · Replies 3 ·
Replies
3
Views
2K
New to the forum - Stored energy to melt ice
  • · Replies 5 ·
Replies
5
Views
3K
Solving the Wave Equation with Method of Characteristics
  • · Replies 12 ·
Replies
12
Views
2K
Syphoning Effect: Is It Possible?
  • · Replies 66 ·
3
Replies
66
Views
7K
Why Do Planets with the Same Orbital Period Have the Same Average Density?
  • · Replies 3 ·
Replies
3
Views
2K