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  1. Greg Bernhardt

    Physics Learning Resources

    Oct 23, 2016 at 10:49 AM

    17

    16
    Replies: 17
  2. ZapperZ

    Recent Noteworthy Physics Papers

    ... 10
    Sep 16, 2016

    184

    5
    Replies: 184
  3. Greg Bernhardt

    B Physics FAQ List

    Feb 3, 2016

    0

    1
    Replies: 0
  4. Greg Bernhardt

    List of credible physics journals

    Mar 10, 2015

    3

    3
    Replies: 3
  5. Integral

    NO HOMEWORK/COURSEWORK QUESTIONS HERE

    Apr 22, 2011

    2

    1
    Replies: 2
  1. Jackson Lee

    I Is AC energy really transferred as EM wave?

    Oct 27, 2016 at 11:43 AM

    12

    3
    Replies: 12
  2. StarWarsNerd

    B Calculating Linear and Angular Quantities from Applied Force

    Oct 27, 2016 at 10:58 AM

    15

    1
    Replies: 15
  3. costanzolab

    I Parts per million of vapor above a liquor in a sealed jar

    Oct 27, 2016 at 10:33 AM

    13

    0
    Replies: 13
  4. Sebastiaan

    I Using Gamma Ray reflector to reduce mass of Shadow shield

    Oct 27, 2016 at 10:32 AM

    2

    0
    Replies: 2
  5. Brad Meacham

    I Focault's Pendulum Recreation for Physics Project

    Oct 27, 2016 at 7:25 AM

    6

    1
    Replies: 6
  6. d9esco

    B Mechanical Physics QUestion

    Oct 27, 2016 at 4:14 AM

    1

    0
    Replies: 1
  7. d4rr3n

    B How does a whip break speed of sound?

    Oct 27, 2016 at 3:39 AM

    9

    0
    Replies: 9
  8. Robzoid

    B Movement caused by Centripetal Force

    Oct 27, 2016 at 2:32 AM

    6

    3
    Replies: 6
  9. Pauly Denino

    I Can different forces cancel themselves?

    Oct 26, 2016 at 6:23 PM

    8

    3
    Replies: 8
  10. samueljun

    A Magnetic field of moving charges

    Oct 26, 2016 at 6:19 PM

    3

    1
    Replies: 3
  11. Karan Punjabi

    B Co ordinate bond

    N/A

    –
    Replies: –
  12. xoxomae

    I Divergence Theorem not equaling 0

    Oct 26, 2016 at 2:16 PM

    2

    0
    Replies: 2
  13. Plaetean

    I 4 vector upper and lower indices

    Oct 26, 2016 at 12:36 PM

    2

    0
    Replies: 2
  14. jonjacson

    B Can a force generate rotation with moment arm=0 ?

    Oct 26, 2016 at 12:24 PM

    8

    3
    Replies: 8
  15. Potatoishere

    B In a Full-wave rectification plus smoothing

    ... 2
    Oct 26, 2016 at 12:22 PM

    31

    4
    Replies: 31
  16. FilipLand

    I Induced voltage and current in an odd scenario

    Oct 26, 2016 at 10:40 AM

    3

    0
    Replies: 3
  17. Mary_089

    I Stokes Number for Particle Motion?

    Oct 26, 2016 at 6:16 AM

    0

    0
    Replies: 0
  18. Fatlum

    Vehicle speed calculation from pedestrian throw distance

    Oct 26, 2016 at 2:01 AM

    6

    1
    Replies: 6
  19. nabil25

    I why a conductive shield doesn't block the magnetic field?

    Oct 25, 2016 at 11:48 PM

    2

    0
    Replies: 2
  20. George Albercook

    B Calculate maximum safe volume for headphones

    Oct 25, 2016 at 11:41 PM

    3

    0
    Replies: 3
  21. Chan Pok Fung

    B Introducing SHM to high school students

    N/A

    –
    Replies: –
  22. MxwllsPersuasns

    I Understanding Fourier Transforms

    Oct 25, 2016 at 5:59 PM

    1

    1
    Replies: 1
  23. aiop

    B What medium does light move in?

    ... 2
    Oct 25, 2016 at 5:05 PM

    26

    6
    Replies: 26
  24. andyh3930

    B Why do radioactive materials decay in half-lifes?

    Oct 25, 2016 at 5:05 PM

    6

    0
    Replies: 6
  25. ConfusedRookie

    I Coulomb's law in its vector form !?

    Oct 25, 2016 at 4:40 PM

    7

    0
    Replies: 7
  26. Stoyan Petkov

    I Calcuating retinal irradiance from the sun

    Oct 25, 2016 at 4:37 PM

    10

    0
    Replies: 10
  27. Eltahawy

    B How quickly can an electric switch operate?

    Oct 25, 2016 at 4:27 PM

    1

    0
    Replies: 1
  28. barryj

    I Where does the energy come from?

    Oct 25, 2016 at 1:50 PM

    14

    4
    Replies: 14
  29. Old Geezer

    B Where does the torque come from?

    Oct 25, 2016 at 11:49 AM

    18

    3
    Replies: 18
  30. EdColider

    I Mathematical model of a phenomenon

    Oct 25, 2016 at 11:02 AM

    12

    10
    Replies: 12
  31. Experience111

    I Measuring advancing contact angle

    Oct 25, 2016 at 10:14 AM

    0

    0
    Replies: 0
  32. tensor0910

    B Physics behind shooting a basketball.

    Oct 25, 2016 at 10:03 AM

    4

    3
    Replies: 4
  33. nomisme

    I How does a floor mat dissipate noise/vibration?

    Oct 25, 2016 at 6:08 AM

    11

    1
    Replies: 11
  34. Draff

    B Basic electronics Concepts. Can you please help me?

    Oct 25, 2016 at 2:33 AM

    7

    0
    Replies: 7
  35. victorhugo

    B What do we know about the formula for air drag force?

    Oct 25, 2016 at 12:53 AM

    4

    1
    Replies: 4
  36. Miopen

    I Legal to inverse an equation?

    Oct 24, 2016 at 1:36 PM

    10

    2
    Replies: 10
  37. Pablo1122

    I Question about Resultant Forces

    Oct 24, 2016 at 1:21 PM

    5

    0
    Replies: 5
  38. OrangeYogi

    I Heat convection in liquid nitrogen

    Oct 24, 2016 at 11:55 AM

    3

    2
    Replies: 3
  39. Shady99

    B Modal analysis

    Oct 24, 2016 at 5:31 AM

    1

    0
    Replies: 1
  40. failexam

    A Casimir effect and dimensional analysis

    ... 2
    Oct 24, 2016 at 3:56 AM

    34

    1
    Replies: 34
  41. jonjacson

    B Fermat and Snell again

    Oct 24, 2016 at 2:58 AM

    3

    0
    Replies: 3
  42. M Grandin

    2D becomes 3D when looked at by one eye

    Oct 24, 2016 at 2:24 AM

    13

    3
    Replies: 13
  43. Tom79Tom

    I Jet Spread Rate K Values- Momentum diffusement

    Oct 23, 2016 at 10:33 PM

    0

    0
    Replies: 0
  44. pug

    B Where does the current go

    Oct 23, 2016 at 6:59 PM

    14

    3
    Replies: 14
  45. GhostLoveScore

    B Electron accelerated in electric field

    Oct 23, 2016 at 5:42 PM

    6

    2
    Replies: 6
  46. James Birt

    I I have a 2-part question about electromagnetism and motors

    ... 2
    Oct 23, 2016 at 4:31 PM

    37

    17
    Replies: 37
  47. David Anton

    B Measuring charge (or potential) with electroscope?

    Oct 23, 2016 at 4:10 PM

    14

    1
    Replies: 14
  48. m_p_w

    I Beta radiation and Alpha radiation

    Oct 23, 2016 at 3:01 PM

    7

    0
    Replies: 7
  49. Silviu

    I Kepler 3rd law for circular orbits

    Oct 23, 2016 at 8:42 AM

    1

    0
    Replies: 1
  50. rashida564

    B Can the theory change over time

    ... 2
    Oct 23, 2016 at 7:07 AM

    27

    11
    Replies: 27
  51. Kurt Couffez

    A forced vibration on mass between two pull springs

    Oct 23, 2016 at 1:41 AM

    6

    0
    Replies: 6
  52. sevitha heshan

    I Lightning Rod

    Oct 22, 2016 at 10:29 PM

    12

    6
    Replies: 12
  53. Ontophobe

    B Publication Bias and Replication Crisis

    Oct 22, 2016 at 7:00 PM

    7

    3
    Replies: 7
  54. DaveC426913

    B toxicity of Fat Man plutonium

    Oct 22, 2016 at 4:20 PM

    11

    0
    Replies: 11
  55. bc1235

    I Storm Wind Force

    Oct 22, 2016 at 7:42 AM

    6

    0
    Replies: 6
  56. Mohammed Shoaib

    I Bragg diffraction

    Oct 22, 2016 at 4:34 AM

    2

    0
    Replies: 2
  57. Dace123

    B Electromagnetic radiation effect on electric field?

    Oct 22, 2016 at 3:48 AM

    4

    2
    Replies: 4
  58. TheCanadian

    A What is the polarization energy?

    Oct 21, 2016 at 11:39 PM

    1

    0
    Replies: 1
  59. magnetics

    I Lenz's Law in action with different length magnets

    Oct 21, 2016 at 4:10 PM

    2

    0
    Replies: 2
  60. Tiger Blood

    I How much could heaviest flying animal weight?

    Oct 21, 2016 at 2:54 PM

    14

    3
    Replies: 14
  61. Voltux

    I What is the approximate impedance of an RF plasma "antenna"?

    Oct 21, 2016 at 1:27 PM

    4

    0
    Replies: 4
  62. Ontophobe

    B Dropping a Black Hole from Tower of Piza

    Oct 21, 2016 at 1:07 PM

    3

    3
    Replies: 3
  63. cmkluza

    B Where does kinetic energy go in inelastic collision?

    Oct 21, 2016 at 12:22 PM

    12

    0
    Replies: 12
  64. Hunter235711

    I Two Diffraction Gratings - Rotation

    Oct 21, 2016 at 12:19 PM

    1

    0
    Replies: 1
  65. Richard92

    A Resistance calculation on right angle current flow

    Oct 21, 2016 at 12:00 PM

    6

    0
    Replies: 6
  66. ddddd28

    I Can a wave of light activate a force on a physical object?

    Oct 21, 2016 at 11:47 AM

    1

    1
    Replies: 1
  67. victorhugo

    B Air friction and speed & temperature

    Oct 21, 2016 at 10:11 AM

    3

    0
    Replies: 3
  68. Porsha

    B Need confirmation of planetary distances

    Oct 21, 2016 at 9:57 AM

    3

    0
    Replies: 3
  69. Mohammed Shoaib

    I Electric field inside a conducting wire

    Oct 21, 2016 at 8:48 AM

    3

    2
    Replies: 3
  70. Mary Space

    B What does a magnetic field consist of?

    Oct 21, 2016 at 7:33 AM

    17

    10
    Replies: 17
  71. ilik

    B Where can i buy an ordinary optical collimator

    Oct 21, 2016 at 6:56 AM

    4

    0
    Replies: 4
  72. Timtam

    B Bernoullis & Pressure Gradient force

    Oct 21, 2016 at 5:54 AM

    3

    0
    Replies: 3
  73. Condiec391

    I Calculating frictional heat from rotating mass

    Oct 21, 2016 at 5:50 AM

    1

    0
    Replies: 1
  74. ATY

    I Lyapunov Exponent

    Oct 21, 2016 at 3:28 AM

    2

    0
    Replies: 2
  75. dUDEonAfORUM

    B Isobaric formula

    Oct 21, 2016 at 2:03 AM

    1

    0
    Replies: 1
  76. MiLara

    I Why do some but not all derivatives have physical meaning?

    Oct 20, 2016

    12

    1
    Replies: 12
  77. Timtam

    I Bathtub Vortex Pressure difference

    Oct 20, 2016

    3

    0
    Replies: 3
  78. StatGuy2000

    A Relations between statistical physics and theoretical CS

    Oct 20, 2016

    3

    0
    Replies: 3
  79. StevenJacobs990

    B Large Amplitude Pendulum Equation

    Oct 20, 2016

    11

    0
    Replies: 11
  80. Gabriel Ulisses

    I Does a humam body movement generate a vacumm trail? and more

    Oct 20, 2016

    2

    0
    Replies: 2
  81. Metals

    B A statistical definition of Young's Modulus?

    Oct 20, 2016

    8

    1
    Replies: 8
  82. Abel Cavaşi

    A The information about the curvature on the rest

    ... 2
    Oct 20, 2016

    23

    2
    Replies: 23
  83. kith

    I Non-reversibility of '2nd Law' processes

    Oct 20, 2016

    3

    1
    Replies: 3
  84. Dace123

    B Superimposing 2 sources of light slightly out of phase

    Oct 20, 2016

    4

    1
    Replies: 4
  85. Jafar Hussain Shah

    Charge Separation and solar cells?

    Oct 20, 2016

    1

    1
    Replies: 1
  86. PFfan01

    I Is Fermat’s principle appicable to a plane wave?

    Oct 20, 2016

    12

    0
    Replies: 12
  87. Raddy13

    B Entropy unavailable to do work

    Oct 20, 2016

    2

    0
    Replies: 2
  88. Iceified

    B Difference between rate and frequency?

    Oct 20, 2016

    4

    2
    Replies: 4
  89. orthogonal1

    B Net force on 'ground' with object on top of it...?

    Oct 20, 2016

    3

    1
    Replies: 3
  90. Clara Chung

    B Line absorption spectrum and stars

    Oct 20, 2016

    9

    6
    Replies: 9
  91. bugatti79

    Conservation of Angular Momentum

    Oct 20, 2016

    4

    0
    Replies: 4
  92. Jlat

    I Mixing CO2 and N gasses.

    Oct 20, 2016

    1

    0
    Replies: 1
  93. madmax87

    A I need to understand the following E&M points

    Oct 20, 2016

    1

    0
    Replies: 1
  94. Alfreds9

    B Water wicking up porous media and air humidity ?

    Oct 19, 2016

    3

    1
    Replies: 3
  95. JB321

    B Why are there only 6 colors?

    ... 3
    Oct 19, 2016

    57

    22
    Replies: 57
  96. stevepham

    B What is the *truth* of the electrostatic force

    Oct 19, 2016

    15

    5
    Replies: 15
  97. Vikramaditya

    A Lifting a car of 1500 Kg through air compressor

    Oct 19, 2016

    3

    0
    Replies: 3
  98. Mr Davis 97

    I Conservation of momentum sign

    Oct 19, 2016

    6

    0
    Replies: 6
  99. aiop

    B Acceleration to reach space

    Oct 19, 2016

    17

    3
    Replies: 17
  100. kayan

    A Why does Planck's BB emissive power increase with n?

    Oct 19, 2016

    9

    0
    Replies: 9
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