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General Q&A about physics of any type and at any level

57 posts · Subscribe

Activity Age Score Random

81%

+7 −0

Unusual way to write spacetime coordinates/metric: Is there any downside?

1 answer · posted 1y ago by celtschk‭ · last activity 1y ago by dmckee‭

special-relativity

80%

+6 −0

How do constraints work in Lagrangian systems?

1 answer · posted 12mo ago by Ezekiel‭ · last activity 12mo ago by Derek Elkins‭

classical-mechanics lagrangian-formalism constrained-dynamics differential-geometry

80%

+6 −0

What is inflation in cosmology?

2 answers · posted 9mo ago by JohnDoea‭ · last activity 6mo ago by Anonymous‭

inflation cosmology

77%

+5 −0

How does probability conservation work in Dirac's original formulation of relativistic QM?

1 answer · posted 1y ago by Ezekiel‭ · last activity 12mo ago by Derek Elkins‭

special-relativity quantum-mechanics hilbert-space dirac-equation normalization

77%

+5 −0

Should I always write units in equation no matter if it looks like variable?

2 answers · posted 4mo ago by Anonymous‭ · last activity 4mo ago by Canina‭

units

75%

+4 −0

Is it possible to derive the Dieterici equation starting from assumptions about microstates?

0 answers · posted 4mo ago by HDE 226868‭

statistical-mechanics thermodynamics gases

75%

+4 −0

What is the meaning that the universe is flat?

2 answers · posted 5mo ago by JohnDoea‭ · last activity 5mo ago by celtschk‭

universe

71%

+3 −0

Why series springs behave like parallel? A comparison between parallel resistance and series spring.

1 answer · posted 4d ago by Anonymous‭ · last activity 4d ago by Olin Lathrop‭

classical-mechanics springs resistance

71%

+3 −0

What is virtual work?

1 answer · posted 5mo ago by Anonymous‭ · last activity 1mo ago by Anonymous‭

classical-mechanics forces virtual-work

71%

+3 −0

Calculate Center of Thrust

1 answer · posted 2mo ago by Josh Hyatt‭ · last activity 2mo ago by Olin Lathrop‭

force

71%

+3 −0

How can the kinetic energy equation be intuitively understood?

3 answers · posted 1mo ago by gmcgath‭ · last activity 1mo ago by celtschk‭

classical-mechanics energy

71%

+3 −0

What is "order" and "disorder" in entropy?

2 answers · posted 3mo ago by Anonymous‭ · last activity 3mo ago by Derek Elkins‭

thermodynamics entropy

66%

+2 −0

Why we can't find a particle accelerating unless there's some other particle accelerating somewhere else?

3 answers · posted 5mo ago by Anonymous‭ · last activity 5mo ago by Olin Lathrop‭

classical-mechanics force

66%

+2 −0

What happens if an electron collides with a proton?

2 answers · posted 5mo ago by Anonymous‭ · edited 5mo ago by Anonymous‭

electrodynamics atoms electrons protons

66%

+2 −0

Applying Young-Laplace equation on meniscus formed due to rise of liquid on a single plate

0 answers · posted 11mo ago by TripleFault‭

pressure young-laplace

66%

+2 −0

Motion of charged particle inside a magnetic field

0 answers · posted 6mo ago by MissMulan‭ · edited 5mo ago by MissMulan‭

classical-mechanics electrodynamics electromagnetism lorentz

66%

+2 −0

Should Earth's moon colonies being deep underground ensure natural heating?

1 answer · posted 7mo ago by JohnDoea‭ · last activity 7mo ago by Dave Tweed‭

Moon

66%

+2 −0

What is semiholonomic?

1 answer · posted 4mo ago by Anonymous‭ · last activity 4mo ago by HDE 226868‭

semi-holonomic

66%

+2 −0

Interaction terms in Srednicki's proof of spin-statistics theorem

1 answer · posted 10mo ago by Ezekiel‭ · last activity 9mo ago by Mithrandir24601‭

quantum-field-theory spin-statistics

66%

+2 −0

What is Ether theory? (I think the book I read is misinterpreting Ether)

2 answers · posted 4mo ago by A person who doesn't know anything‭ · edited 4mo ago by A person who doesn't know anything‭

special-relativity relativity revolution aether

62%

+3 −1

What does Lagrangian actually represent?

2 answers · posted 5mo ago by Anonymous‭ · last activity 5mo ago by Anonymous‭

lagrangian-formalism

62%

+3 −1

Why should there not be water below 6kms in the Earths crust?

0 answers · posted 10mo ago by Conrado‭ · edited 10mo ago by Conrado‭

pressure

60%

+1 −0

Superconductivity

0 answers · posted 5mo ago by MissMulan‭

solid-state superconductivity

60%

+4 −2

Would we need Alternating Current if superconducting wires existed?

2 answers · posted 11mo ago by theabbie‭ · last activity 11mo ago by celtschk‭

superconductor alternating-current

60%

+1 −0

What's the importance of Poisson brackets?

0 answers · posted 4mo ago by Anonymous‭ · edited 4mo ago by Anonymous‭

hamilton-dynamics hamilton-formalism poisson-brackets

60%

+1 −0

What happens if an electron collides with another electron?

0 answers · posted 5mo ago by Anonymous‭

electrodynamics atoms electrons protons

60%

+1 −0

Find jerk of time varying force

1 answer · posted 5mo ago by MissMulan‭ · last activity 5mo ago by Mithrandir24601‭

newtonian-mechanics potential-energy acceleration

60%

+1 −0

Find position of a particle at a time

1 answer · posted 5mo ago by MissMulan‭ · last activity 5mo ago by celtschk‭

time newtonian-mechanics forces

60%

+1 −0

What does Laplace operator represent?

1 answer · posted 3mo ago by Anonymous‭ · last activity 1mo ago by Anonymous‭

laplace

60%

+1 −0

Signal modeling as only digital, only analogue, or as both

3 answers · posted 5mo ago by JohnDoea‭ · last activity 5mo ago by Lundin‭

signal-processing

60%

+1 −0

Clear up confusion on Minkowski signature

1 answer · posted 1mo ago by Anonymous‭ · edited 1mo ago by Anonymous‭

special-relativity minkowski-metric coordinate-systems metric-tensor

60%

+1 −0

Is $E=mc^2$ true for all frame of references?

1 answer · posted 1mo ago by Anonymous‭ · last activity 1mo ago by Anonymous‭

special-relativity mass energy relativistic-mass

60%

+1 −0

What's the equation of kinetic energy of charged particle?

0 answers · posted 29d ago by Anonymous‭

kinetic-energy lagrangian particles

60%

+1 −0

What's the meaning of "outdated" in physics?

1 answer · posted 29d ago by Anonymous‭ · last activity 6d ago by Mithrandir24601‭

terminology

57%

+2 −1

Why would a 1.74 index lens be more prone to chip and be less resilient than 1.67?

1 answer · posted 11mo ago by VLDR‭ · last activity 11mo ago by Olin Lathrop‭

lenses

50%

+0 −0

Is that electron which jumps from one stationary state to another?

1 answer · posted 1d ago by Anonymous‭ · last activity 1d ago by Olin Lathrop‭

quantum-mechanics atoms electrons particle-physics bohr-model

50%

+0 −0

What is $\mathcal{O}$ in integration of potential?

1 answer · posted 1mo ago by Anonymous‭ · last activity 1mo ago by Anonymous‭

electromagnetism potential-energy potential

50%

+0 −0

How electric displacement is proportional to surface charge?

1 answer · posted 24d ago by Anonymous‭ · last activity 15d ago by Anonymous‭

electrostatics charge conductor gauss-law dielectric

50%

+0 −0

May it be that there are more than 8/9 planets in our solar system?

0 answers · posted 5h ago by JohnDoea‭ · edited 5h ago by JohnDoea‭

planet

50%

+0 −0

Prove differential form of Lagrangian

1 answer · posted 5mo ago by Anonymous‭ · last activity 5mo ago by celtschk‭

lagrangian-formalism

50%

+0 −0

Where did the measuring systems (metric & imperial) originate and how? [closed]

0 answers · posted 6mo ago by IDoYTSoSubHaha‭ · closed 4mo ago by Mithical‭

measurement metric-system imperial-system

50%

+0 −0

What is Apsidal Vector?

0 answers · posted 4mo ago by Anonymous‭

apsidal vectors

50%

+0 −0

Magnetic charges to solve interaction between 2 magnetic dipoles

1 answer · posted 6mo ago by MissMulan‭ · last activity 6mo ago by Olin Lathrop‭

electrostatics

50%

+1 −1

Natural ways to acquire gravity for a colony on earth's moon

2 answers · posted 7mo ago by JohnDoea‭ · last activity 5mo ago by Canina‭

Moon Gravity

42%

+1 −2

Is it plausible to desire a "universal" calendar applicable everywhere in our universe?

3 answers · posted 5mo ago by JohnDoea‭ · edited 1mo ago by Trilarion‭

time

42%

+1 −2

Book suggestion for Classical Mechanics

1 answer · posted 5mo ago by Anonymous‭ · last activity 4mo ago by Anonymous‭

classical-mechanics book-suggestion

42%

+1 −2

Are there areas in the observable universe which surely cannot support life as we know them?

1 answer · posted 1mo ago by JohnDoea‭ · last activity 1mo ago by Olin Lathrop‭

terminology

42%

+1 −2

Does folding glasses increase the probability of separating at the hinge?

1 answer · posted 10mo ago by VLDR‭ · last activity 10mo ago by Olin Lathrop‭

lenses

40%

+0 −1

How can I turn a floor lamp, that lights upward, into a reading light? [closed]

0 answers · posted 1y ago by VLDR‭ · edited 6mo ago by VLDR‭

light

40%

+0 −1

Explain like I'm 5 – After glancing at a clock, why does the first second sometimes feel longer than the rest? [closed]

0 answers · posted 11mo ago by VLDR‭ · closed 11mo ago by Mithrandir24601‭

time

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