• Balloon rocket- What happens inside and why the reaction?

    Updated: 2021-08-30 15:00:35
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  • Stepper motor current/torque model

    Updated: 2021-08-30 14:52:07
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  • Entropy after removing partition separating gas into two compartments

    Updated: 2021-08-30 14:51:42
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  • The Probability Distribution and 'Elements of Reality'

    Updated: 2021-08-30 14:40:34
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  • Where is the quantum system prior to measurement?

    Updated: 2021-08-30 14:40:09
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  • Find the value of ##\theta## when the Vx and Vy components are the same

    Updated: 2021-08-30 13:06:15
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  • Is the Big Bang only about the observable Universe?

    Updated: 2021-08-30 11:54:42
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  • Cosmological constant for the Universe's expansion

    Updated: 2021-08-30 08:55:51
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  • The Fate of the Universe -- Expansion or Collapse?

    Updated: 2021-08-30 08:49:56
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  • Questions about dark matter, matter and elements

    Updated: 2021-08-30 08:44:18
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  • Dark matter mass and halos

    Updated: 2021-08-30 08:20:54
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  • Best layman non mathematical interesting book on Ray and wave optics

    Updated: 2021-08-30 07:11:52
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  • Does the classical aberration formula make sense?

    Updated: 2021-08-30 07:00:17
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  • Dissipative and dispersive derivatives

    Updated: 2021-08-30 07:00:13
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  • Analytical expression of Cosmic Variance - Poisson distribution?

    Updated: 2021-08-30 05:40:19
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  • Disk hit by two masses

    Updated: 2021-08-30 00:05:30
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  • Why are absorption spectra continuous?

    Updated: 2021-08-29 22:00:44
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  • Measuring change in g with height (TV program many years ago)

    Updated: 2021-08-29 22:00:41
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  • Confusion with the direction of E-fields near conductors

    Updated: 2021-08-29 22:00:39
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  • Time needed to cross a delta potential barrier inside an infinite square well

    Updated: 2021-08-29 22:00:37
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  • Evolutionary Computing

    Updated: 2021-08-29 16:13:07
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  • A gradient field (analysing a picture)

    Updated: 2021-08-29 13:03:12
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  • Critical points of a multivariable function (wave equation)

    Updated: 2021-08-29 11:00:09
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  • Electrostatic charge build up in environmental electron microscopy

    Updated: 2021-08-29 04:08:22
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  • Violation of Special Relativity Principle (thought experiment)

    Updated: 2021-08-29 04:08:21
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  • A question on proper time in special relativity

    Updated: 2021-08-29 04:08:19
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  • Trouble simplifying the Lagrangian

    Updated: 2021-08-29 04:08:17
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  • Vapor - Liquid Equilibrium Equation (VLE)

    Updated: 2021-08-28 19:24:19
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  • Why this triple integral is not null?

    Updated: 2021-08-28 19:24:16
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  • Does a photon travel freely through the CMB photon gas?

    Updated: 2021-08-28 19:24:14
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  • Problem understanding the nature of this equation: z=sqrt(2-x^-y^2)

    Updated: 2021-08-28 19:24:13
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  • How long did inflation last in an eternal inflating universe?

    Updated: 2021-08-28 19:24:07
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  • Searching for a book like Evolution of Physics or Physics for the Inquiring Mind

    Updated: 2021-08-28 19:24:06
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  • Vibrations in building a cavity

    Updated: 2021-08-28 10:04:59
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  • Relation of ionisation voltage vs. pressure for hydrogen

    Updated: 2021-08-28 01:27:51
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  • Is an experiment planned to discern determinism and randomness in QM

    Updated: 2021-08-27 16:03:53
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  • Definition of single-pole and pole-dipole particles

    Updated: 2021-08-27 16:03:46
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  • Conversations on Quantum Gravity

    Updated: 2021-08-26 23:32:04
    Things for many years now have been going badly for string theory on the public relations front. Today the Economist has Physics seeks the future: Bye, bye, little Susy, where one finds out that: But, no Susy, no string theory. … Continue reading →

  • Conservation of momentum in a collision

    Updated: 2021-08-26 22:52:25
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  • Some algebra in Schutz's textbook

    Updated: 2021-08-26 14:24:20
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  • New take on Tegmarks MUH --Geometric Transformation Internalization

    Updated: 2021-08-25 21:31:30
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  • Are there more theories about the start of our Universe?

    Updated: 2021-08-25 04:36:22
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  • Multiverse Quantity

    Updated: 2021-08-25 04:36:04
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  • Parity operator in 2D

    Updated: 2021-08-25 04:35:17
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  • More of the Same (Physics, Math and Unification)

    Updated: 2021-07-29 21:57:25
    I was going to just provide the following links with a some comments, but decided it would be a good idea to put them into what seems to me the larger context of where we are in fundamental physics and … Continue reading →

  • Steven Weinberg 1933-2021

    Updated: 2021-07-24 16:03:50
    I heard this morning the news that Steven Weinberg passed away yesterday at the age of 88.  He was arguably the dominant figure in theoretical particle physics during its period of great success from the late sixties to the early … Continue reading →

  • The Problem of Quantization

    Updated: 2021-07-12 22:09:55
    I’ve been watching Witten’s ongoing talks about geometric Langlands mentioned here, and wanted to recommend to everyone, mathematician or physicist, the first of them, on The Problem of Quantization (pdf here, video here, the question session is very worthwhile). For … Continue reading →

  • Deterioration of the World’s Thinking About the Deepest Stringy Ideas

    Updated: 2021-07-12 20:53:27
    For quite a few years now, I’ve been mystified about what is going on in string theory, as the subject has become dominated by AdS/CFT inspired work which has nothing to do with either strings or any visible idea about … Continue reading →

  • Even More Langlands

    Updated: 2021-07-06 20:54:41
    Various news at least tangentially related to the Langlands program: Cambridge University Press this month is publishing a volume edited by Julia Mueller, entitled The Genesis of the Langlands Program. The chapters by various authors concentrate on Langlands himself and … Continue reading →

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