Other Physics Topics Forum

Post thread
Participate in expert physics discussion. Discussion on the nature and properties of matter and energy. This area is for topics that don't fit the other categories. Mainstream physics only.
B Length, Time, and Velocity -- Which are fundamental quantities?
  • · Replies 50 ·
2
Replies
50
Views
8K
I Work done by a gas in a heat engine which compresses a spring
  • · Replies 14 ·
Replies
14
Views
3K
B Why are gravitons needed to explain gravitational attraction?
  • · Replies 8 ·
Replies
8
Views
3K
I Trouble understanding the SI definition of 1 second
  • · Replies 56 ·
2
Replies
56
Views
6K
I Higher Dimensional Time Implications?
  • · Replies 8 ·
Replies
8
Views
4K
I Understanding iris electrode and iris doublet (Accelerator physics)
  • · Replies 0 ·
Replies
0
Views
3K
I Mass & Density: Unpacking Feynman's Idea
  • · Replies 4 ·
Replies
4
Views
3K
B Why can't gravity be just a form of magnetic attraction?
  • · Replies 6 ·
Replies
6
Views
4K
A Feynman parametrization integration by parts
  • · Replies 1 ·
Replies
1
Views
3K
I Alternate expressions for the uncertainty propagation
  • · Replies 1 ·
Replies
1
Views
3K
I Standard deviation and count rate
  • · Replies 5 ·
Replies
5
Views
3K
I Discussing Information Theory with non-scientists
  • · Replies 23 ·
Replies
23
Views
3K
B Energy: Abstract Concept or Entity?
  • · Replies 36 ·
2
Replies
36
Views
7K
I The Big Bang and the original size of Universe
  • · Replies 1 ·
Replies
1
Views
2K
I Changing or breaking the most fundamental laws and symmetries?
  • · Replies 1 ·
Replies
1
Views
3K
I What wavelength can penetrate soil to 15 feet?
  • · Replies 36 ·
2
Replies
36
Views
5K
I What is meant by 'affine' model in physical sciences?
  • · Replies 3 ·
Replies
3
Views
2K
I Explaining the Hierarchy problem for beginners
  • · Replies 11 ·
Replies
11
Views
5K
I Are there any inexpensive spectrometers?
  • · Replies 18 ·
Replies
18
Views
4K
B Can Push Travel Faster Than Light?
  • · Replies 5 ·
Replies
5
Views
3K
B Are Electrons the Building Blocks of Our Universe?
  • · Replies 40 ·
2
Replies
40
Views
4K
I Is anything in the physical world infinite?
  • · Replies 79 ·
3
Replies
79
Views
9K
B What sort of can would roll the fastest?
  • · Replies 12 ·
Replies
12
Views
8K
B Why are things the color they are?
  • · Replies 3 ·
Replies
3
Views
2K
B Distance between two points on Earth doesn't increase with altitude?
  • · Replies 18 ·
Replies
18
Views
4K
B Does Light Energy contain Heat Energy in a large scale?
  • · Replies 2 ·
Replies
2
Views
3K
I Propagation of uncertainty with some constants
  • · Replies 8 ·
Replies
8
Views
3K
I What does "upright" mean in geometric optics?
  • · Replies 2 ·
Replies
2
Views
3K
A Structural coloration of a zeolite monolayer
  • · Replies 7 ·
Replies
7
Views
2K
B Why exactly do we need the gravitational constant?
  • · Replies 11 ·
Replies
11
Views
3K
B A question about why gravity is only attractive
  • · Replies 7 ·
Replies
7
Views
3K
A SO(3) group, Heisenberg Hamiltonian
  • · Replies 1 ·
Replies
1
Views
2K
B Can You Use a Rubber Bracelet as a Buoyancy Reference for Freediving?
  • · Replies 23 ·
Replies
23
Views
3K
I Help Needed for Lens Selection for Fiber optics
  • · Replies 1 ·
Replies
1
Views
2K
I What happens to photonic molecules?
  • · Replies 5 ·
Replies
5
Views
2K
B Can a fireplace be used as a fallout shelter?
  • · Replies 7 ·
Replies
7
Views
2K
B Can Inductive Reasoning Explain the Movement of Strings on Spools and Bikes?
  • · Replies 47 ·
2
Replies
47
Views
5K
I Permittivity/Permeability, the speed of light, and the meter
  • · Replies 12 ·
Replies
12
Views
4K
B Questions on how helicopters fly
  • · Replies 36 ·
2
Replies
36
Views
6K
B Can Himalayan Salt Dissolve in Candle Wax?
  • · Replies 48 ·
2
Replies
48
Views
22K
B 4 Questions About Lenz's Law Experiment
  • · Replies 20 ·
Replies
20
Views
5K
I How Does the Angle at P1 Change Over Time Until the Object Falls?
  • · Replies 2 ·
Replies
2
Views
2K
I The Job of the Demon: Compressing Gas Without Work
  • · Replies 3 ·
Replies
3
Views
2K
I Rigid body physics (machine learning environment)
  • · Replies 2 ·
Replies
2
Views
2K
B Andy Meadowcroft - Introduction (and a question about nuclear fusion)
  • · Replies 12 ·
Replies
12
Views
2K
I Looking for a Comprehensive Explanation of Natural Units
  • · Replies 2 ·
Replies
2
Views
2K
I Radio waves and height gain in fading zones
  • · Replies 8 ·
Replies
8
Views
2K
I Understanding Tensors & Knot Theory in Physics
  • · Replies 4 ·
Replies
4
Views
3K
I Rotational Orientation of Monatomic Gas: Angular Momentum Effects
  • · Replies 6 ·
Replies
6
Views
2K
B Would a fall from 53 centimeters break the glass from a window?
  • · Replies 27 ·
Replies
27
Views
3K
I Why in an electric circuit with only a generator the resistance R=infinity?
  • · Replies 4 ·
Replies
4
Views
1K
I Why does light travel slower in water?
  • · Replies 31 ·
2
Replies
31
Views
6K
I Application of failure criteria to viscoelastic materials
  • · Replies 1 ·
Replies
1
Views
1K
I How does the Poynting vector factor into a normal circuit?
  • · Replies 29 ·
Replies
29
Views
7K
I Getting a sauna to a certain temperature - faster with more rocks?
  • · Replies 25 ·
Replies
25
Views
5K
I Usage of First Order Elastic Constants in Soft Body Equations
  • · Replies 3 ·
Replies
3
Views
2K
B Why does a DC motor have a restricted speed?
  • · Replies 40 ·
2
Replies
40
Views
5K
B Work and Friction: How Does Fxv Apply?
  • · Replies 6 ·
Replies
6
Views
2K
B Create an artificial eddy/tornado
  • · Replies 13 ·
Replies
13
Views
4K
I Is There a Connection Between Rainbows and Holograms?
  • · Replies 33 ·
2
Replies
33
Views
7K
B Oberth effect on a slope - experiment idea
  • · Replies 6 ·
Replies
6
Views
2K
I Do you have an example of a truly random phenomenon?
  • · Replies 122 ·
5
Replies
122
Views
13K
I NMR Remote Sensing: Does US Army Detect Buried Weapons?
  • · Replies 2 ·
Replies
2
Views
2K
I Chain on a slope remains still if its end points are of equal height?
  • · Replies 7 ·
Replies
7
Views
3K
B Beam of air: Extending the range of a fan
  • · Replies 17 ·
Replies
17
Views
3K
A Meaning of density of microstates in phase space
  • · Replies 1 ·
Replies
1
Views
2K
B Space propulsion without mass ejecting
  • · Replies 3 ·
Replies
3
Views
1K
B Could satellite be geo-stationary away from equatorial plane?
  • · Replies 5 ·
Replies
5
Views
2K
I Confirm 6ft Tall Boy Throwing Tennis Ball 🎾 in Gym
  • · Replies 27 ·
Replies
27
Views
3K
I Where does Hamilton's Principle come from?
  • · Replies 4 ·
Replies
4
Views
2K
I Hydrodynamics - Wave of Translation
  • · Replies 5 ·
Replies
5
Views
2K
I Designing parabolic dish and feedhorn
  • · Replies 22 ·
Replies
22
Views
6K
B Simple Acoustics Question -- Which neighbor hears the other better?
  • · Replies 6 ·
Replies
6
Views
2K
B Question about magnetizing and the First law of Thermodynamics
  • · Replies 1 ·
Replies
1
Views
1K
A How to calculate the temperature change of a laser-irradiated material
  • · Replies 6 ·
Replies
6
Views
3K
B One way speed of light in one reference frame measurement
  • · Replies 5 ·
Replies
5
Views
2K
I Using Diffraction (i.e., Fresnel Zone Plate) to defocus/diverge light
  • · Replies 2 ·
Replies
2
Views
2K
I Can you practically measure an infinite amount of some quantity?
  • · Replies 10 ·
Replies
10
Views
2K
B Is a Battery-Electric Vehicle Really More Efficient Than a Gas Car?
  • · Replies 5 ·
Replies
5
Views
2K
I Image for increase in gravitational potential energy in radial field
  • · Replies 6 ·
Replies
6
Views
2K
I Theoretical maximum efficiency of a heat engine without Carnot
  • · Replies 1 ·
Replies
1
Views
2K
B Cheapest equipment to boil water at 60℃
  • · Replies 15 ·
Replies
15
Views
3K
I Chemical potential and Fermi level
  • · Replies 1 ·
Replies
1
Views
2K
I Fermi energy definition and Fermi-Dirac distribution
  • · Replies 3 ·
Replies
3
Views
2K
I Is the Fermi-Dirac distribution equal to zero at the state of highest energy?
  • · Replies 1 ·
Replies
1
Views
1K
I What is the Meaning of the Fermi Energy?
  • · Replies 1 ·
Replies
1
Views
2K
I Can iron filings cause permanent eye damage?
  • · Replies 6 ·
Replies
6
Views
3K
B How far do photons travel inside common lasers?
  • · Replies 6 ·
Replies
6
Views
2K
B Regarding electron-positron annihilation
  • · Replies 5 ·
Replies
5
Views
2K
B Projectile motion — Thinking about forces on a curve ball
  • · Replies 11 ·
Replies
11
Views
2K
A What are the rational solutions to the square root of four?
  • · Replies 12 ·
Replies
12
Views
3K
B What if I could see in radio instead of light?
  • · Replies 39 ·
2
Replies
39
Views
6K
I Apparent Poynting vector contradiction
  • · Replies 2 ·
Replies
2
Views
4K
B EM radiation creation within stars
  • · Replies 3 ·
Replies
3
Views
2K
A Looking for the earliest articles about Quantum Gravity
  • · Replies 2 ·
Replies
2
Views
2K
B What Happens If Tachyons Are Detected?
  • · Replies 28 ·
Replies
28
Views
3K
B Electromagnetic force of Electrons
  • · Replies 15 ·
Replies
15
Views
2K
Edward Witten and the Mathematical Multiverse?
  • · Replies 3 ·
Replies
3
Views
2K
Physical Meaning of Time Inverse
  • · Replies 3 ·
Replies
3
Views
17K
B According to current physics, is vacuum still something or nothing?
  • · Replies 40 ·
2
Replies
40
Views
5K