Hottest Questions Today

2

votes

1

answer

16

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Why do balloons get cold when they deflate?

thermodynamics

answered 21 mins ago niels nielsen 24.8k

0

votes

3

answers

61

views

What does $\Delta$ stand for? [on hold]

modified 35 mins ago Qmechanic♦ 112k

0

votes

1

answer

15

views

How do I calculate the pressure $p_0$ on top of the water reservoir?

classical-mechanics fluid-dynamics fluid-statics superfluidity

answered 1 hour ago mike stone 9,500

0

votes

1

answer

15

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Interaction picture Sakurai

quantum-mechanics schroedinger-equation hamiltonian time-evolution

modified 36 mins ago Qmechanic♦ 112k

3

votes

3

answers

45

views

Which basis does the wavefunction collapse to?

quantum-mechanics wavefunction wavefunction-collapse

answered 2 hours ago ACuriousMind♦ 75.4k

0

votes

2

answers

23

views

The reason behind circular motion of vehicles

newtonian-mechanics friction centripetal-force centrifugal-force

answered 1 hour ago Philip Wood 10.5k

0

votes

2

answers

53

views

Why do we don't get exact answers to our experiment but rather an approx value to it?

experimental-physics error-analysis approximations statistics

modified 3 hours ago Qmechanic♦ 112k

4

votes

2

answers

87

views

From where do electrons gain kinetic energy through a circuit?

electric-circuits electrons electric-current electrical-resistance conductors

modified 1 hour ago Bob D 11.8k

1

vote

0

answers

15

views

Are black holes affected by tidal forces?

black-holes orbital-motion tidal-effect

asked 2 hours ago DeinFreund 23

1

vote

1

answer

25

views

Intuitive Understanding of Vectors?

vectors

answered 2 hours ago DanDan0101 29

0

votes

2

answers

30

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Friction and Circular Motion

newtonian-mechanics friction

modified 1 hour ago Gert 18.5k

3

votes

1

answer

29

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Is Einstein's Photoelectric effect a reversible phenomenon?

electrons photoelectric-effect reversibility

answered 4 hours ago Gilbert 5,618

1

vote

2

answers

50

views

Why are certain quantities so fundamental to physics

energy momentum energy-conservation work potential-energy

answered 4 hours ago Christyan Condé 18

0

votes

1

answer

56

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Which wave function should I adopt?

quantum-mechanics homework-and-exercises reference-frames wavefunction schroedinger-equation

modified 30 mins ago Cosmas Zachos 20k

-1

votes

1

answer

40

views

Is Loop Quantum Gravity related with loops?

loop-quantum-gravity wilson-loop

modified 4 hours ago Qmechanic♦ 112k

0

votes

1

answer

26

views

Why do we subtract least count in measurement? Trying to understand intuitively

measurements error-analysis statistics

modified 4 hours ago Qmechanic♦ 112k

0

votes

1

answer

27

views

Dispersion under Classical and Quantum regimes

quantum-mechanics frequency dispersion

answered 1 hour ago mike stone 9,500

0

votes

2

answers

42

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Buoyant force of tides and conservation of energy

newtonian-mechanics energy-conservation tidal-effect

modified 4 hours ago Bob D 11.8k

0

votes

1

answer

23

views

Why don't we consider the Gamow factor when configuring the cyclotron?

particle-physics nuclear-physics

answered 4 hours ago anna v 167k

2

votes

1

answer

30

views

Current in RC circuit

electric-circuits electric-current electrical-resistance capacitance voltage

modified 6 hours ago MarianD 1,259

1

vote

0

answers

22

views

Why do we consider the viscous force to be tangential?

fluid-dynamics friction drag viscosity

modified 5 hours ago Qmechanic♦ 112k

0

votes

0

answers

12

views

Faraday disk - Electric fields

electromagnetism classical-mechanics classical-electrodynamics

modified 5 hours ago Aaron Stevens 21k

0

votes

1

answer

56

views

Calculate escape velocity without using energy?

homework-and-exercises newtonian-mechanics newtonian-gravity orbital-motion escape-velocity

answered 9 hours ago James Cochran 61

0

votes

0

answers

17

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Scully’s DCQE paper 1999 - reasons for phase shift

quantum-mechanics

modified 5 hours ago Michael W. 1

0

votes

0

answers

16

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Why is the necessary energy for a photon to lift an electron higher than the band gap energy?

semiconductor-physics

asked 6 hours ago Ben 342

0

votes

0

answers

15

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Plasma Condensation

plasma-physics

asked 6 hours ago Joeseph123 19

0

votes

2

answers

64

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Basic Special Relativity Question

special-relativity inertial-frames observers

modified 5 hours ago Qmechanic♦ 112k

-1

votes

0

answers

36

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$z$ component of angular momentum under Lorentz transformation for massless particle

special-relativity group-theory lorentz-symmetry group-representations helicity

modified 6 hours ago amilton moreira 310

0

votes

0

answers

22

views

Thermal average of fermionic operators in QFT

condensed-matter many-body greens-functions

asked 7 hours ago physicist23 8

2

votes

1

answer

20

views

How to figure out the distribution of Normal Force on a body?

newtonian-mechanics rigid-body-dynamics

answered 6 hours ago Bob D 11.8k

0

votes

0

answers

16

views

Why is the Fermi level (energy) shfited in doped semiconductors?

semiconductor-physics fermi-energy

modified 6 hours ago MarianD 1,259

-2

votes

0

answers

37

views

Is there an equation that describes the spacetime inside an event horizon?

black-holes event-horizon

asked 9 hours ago Digcoal 6

1

vote

1

answer

22

views

Definition of electron density in DFT

quantum-mechanics physical-chemistry density-functional-theory

answered 8 hours ago gingras.ol 686

0

votes

1

answer

21

views

Finding Electric Field Outside Solid Sphere of Charge (Treated as Many Discs of Charge)

electrostatics

answered 6 hours ago G. Smith 19.8k

1

vote

1

answer

27

views

Isn't inertia experience by person in moving bus is Torque

newtonian-mechanics reference-frames inertia

answered 9 hours ago Bob D 11.8k

1

vote

0

answers

15

views

Why is this way of deducig the 1 dimensional Maxwell-Boltzmann Distribution wrong?

thermodynamics particle-physics energy statistical-mechanics

asked 8 hours ago JohnnyGui 261

15

votes

6

answers

706

views

What is the most precise physical measurement ever measured?

experimental-physics measurements

answered yesterday amateurAstro 486

22

votes

13

answers

4k

views

Escape Velocity - Won't the orbital path just become larger with higher initial velocity?

newtonian-gravity orbital-motion escape-velocity

modified yesterday mchammer 1

1

vote

0

answers

18

views

How to find the terms of Post-Newtonian approximation

general-relativity approximations post-newtonian

asked 9 hours ago Mauro Giliberti 308

0

votes

0

answers

25

views

Effectiveness of heating nitrogen gas for purging moisture

thermodynamics

asked 10 hours ago h.a995 3

7

votes

8

answers

754

views

Physical Interpretation of an Overdamped Pendulum

homework-and-exercises friction harmonic-oscillator dissipation

modified 22 hours ago Martijn Weterings 141

2

votes

2

answers

76

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Divergence of a Vector Field - Surprising Result [on hold]

homework-and-exercises vectors vector-fields

modified 14 hours ago Aaron Stevens 21k

0

votes

0

answers

29

views

Infinitesimal Perturbation in a potential well

quantum-mechanics potential-energy perturbation-theory

asked 11 hours ago Baibhab Bose 6

1

vote

2

answers

28

views

The effect of tension force on a pendulum swinging in simple harmonic motion

harmonic-oscillator centripetal-force

modified 9 hours ago Eli 1,473

42

votes

3

answers

9k

views

Doesn't the speed of light limit imply the same electron can be annihilated twice?

quantum-mechanics special-relativity speed-of-light

modified 2 days ago Peter Mortensen 2,017

9

votes

5

answers

3k

views

Has the speed of light ever been measured in vacuum?

general-relativity speed-of-light measurements vacuum cosmic-microwave-background

answered yesterday Justin 121

-1

votes

0

answers

23

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The problem was found in the book of mechanics by Kleppner and Kolenkow [on hold]

homework-and-exercises newtonian-mechanics rotational-dynamics reference-frames

modified 10 hours ago Qmechanic♦ 112k

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