scholarly journals Kinetic energy and momentum distribution of isotopic liquid helium mixtures

2018 ◽  
Vol 148 (10) ◽  
pp. 102308 ◽  
Author(s):  
Massimo Boninsegni
Keyword(s):  
Kinetic Energy ◽  
Liquid Helium ◽  
Momentum Distribution ◽  
Helium Mixtures ◽  
Energy And Momentum

Kinetic energy and momentum factors for rough pipes

1969 ◽  
Vol 47 (6) ◽  
pp. 515-517 ◽  
Author(s):  
Robin G. Booth ◽  
Norman Epstein
Keyword(s):  
Kinetic Energy ◽  
Energy And Momentum

scholarly journals The theory of the chain fountain revisited

2021 ◽  
Vol 2090 (1) ◽  
pp. 012166
Author(s):  
Dragos-Victor Anghel
Keyword(s):  
Energy Transfer ◽  
Kinetic Energy ◽  
Significant Role ◽  
Mechanical Work ◽  
Scientific Consensus ◽  
Energy And Momentum ◽  
Work Done

Abstract We analyze the chain fountain effect-the chain siphoning when falling from a container onto the floor. We argue that the main reason for this effect is the inertia of the chain, whereas the momentum received by the beads of the chain from the bottom of the container (typically called “kicks”) plays no significant role. The inertia of the chain leads to an effect similar to pulling the chain over a pulley placed up in the air, above the container. In another model (the so called “scientific consensus”), it was assumed that up to half of the mechanical work done by the tension in the chain may be wasted when transformed into kinetic energy during the pickup process. This prevented the chain to rise unless the energy transfer in the pickup process is improved by the “kicks” from the bottom of the container. Here we show that the “kicks” are unnecessary and both, energy and momentum are conserved-as they should be, in the absence of dissipation-if one properly considers the tension and the movement of the chain. By doing so, we conclude that the velocity acquired by the chain is high enough to produce the fountain effect. Simple experiments validate our model and certain configurations produce the highest chain fountain, although “kicks” are impossible.

THE ZERO-POINT KINETIC ENERGY OF LIQUID HELIUM

1955 ◽  
Vol 33 (12) ◽  
pp. 797-800 ◽  
Author(s):  
D. G. Henshaw ◽  
D. G. Hurst
Keyword(s):  
Kinetic Energy ◽  
Neutron Diffraction ◽  
Liquid Helium ◽  
Latent Heat ◽  
Interatomic Potential ◽  
Zero Point ◽  
Potential Functions ◽  
Point Temperature ◽  
Heat Of Vaporization ◽  
Latent Heat Of Vaporization

The zero-point kinetic energy of liquid helium has been calculated from the interatomic potential, the latent heat of vaporization, and atomic distributions derived from neutron diffraction measurements. Calculations were carried out for two liquid temperatures and several published interatomic potential functions. The resulting values of the "zero-point temperature" lie between 9.0°K. and 12.6°K.

Holism: mental and semantic

2018 ◽  
Author(s):  
Ned Block
Keyword(s):  
Kinetic Energy ◽  
Real Difference ◽  
Theoretical Terms ◽  
Inferential Role ◽  
The World ◽  
Energy And Momentum ◽  
Small Parts ◽  
The Web ◽  
Belief Content

Mental (or semantic) holism is the doctrine that the identity of a belief content (or the meaning of a sentence that expresses it) is determined by its place in the web of beliefs or sentences comprising a whole theory or group of theories. It can be contrasted with two other views: atomism and molecularism. Molecularism characterizes meaning and content in terms of relatively small parts of the web in a way that allows many different theories to share those parts. For example, the meaning of ‘chase’ might be said by a molecularist to be ‘try to catch’. Atomism characterizes meaning and content in terms of none of the web; it says that sentences and beliefs have meaning or content independently of their relations to other sentences or beliefs. One major motivation for holism has come from reflections on the natures of confirmation and learning. As Quine observed, claims about the world are confirmed not individually but only in conjunction with theories of which they are a part. And, typically, one cannot come to understand scientific claims without understanding a significant chunk of the theory of which they are a part. For example, in learning the Newtonian concepts of ‘force’, ‘mass’, ‘kinetic energy’ and ‘momentum’, one does not learn any definitions of these terms in terms that are understood beforehand, for there are no such definitions. Rather, these theoretical terms are all learned together in conjunction with procedures for solving problems. The major problem with holism is that it threatens to make generalization in psychology virtually impossible. If the content of any state depends on all others, it would be extremely unlikely that any two believers would ever share a state with the same content. Moreover, holism would appear to conflict with our ordinary conception of reasoning. What sentences one accepts influences what one infers. If I accept a sentence and then later reject it, I thereby change the inferential role of that sentence, so the meaning of what I accept would not be the same as the meaning of what I later reject. But then it would be difficult to understand on this view how one could rationally – or even irrationally! – change one’s mind. And agreement and translation are also problematic for much the same reason. Holists have responded (1) by proposing that we should think not in terms of ‘same/different’ meaning but in terms of a gradient of similarity of meaning, (2) by proposing ‘two-factor’ theories, or (3) by simply accepting the consequence that there is no real difference between changing meanings and changing beliefs.

Quantum Momentum Distribution and Kinetic Energy in SolidHe4

2004 ◽  
Vol 93 (7) ◽  
Author(s):  
S. O. Diallo ◽  
J. V. Pearce ◽  
R. T. Azuah ◽  
H. R. Glyde
Keyword(s):  
Kinetic Energy ◽  
Momentum Distribution

The role of drift mass in the kinetic energy and momentum of periodic water waves and sound waves

1997 ◽  
Vol 331 ◽  
pp. 429-438 ◽  
Author(s):  
CHIA-SHUN YIH
Keyword(s):  
Kinetic Energy ◽  
Water Waves ◽  
Three Dimensional ◽  
Periodic Waves ◽  
Sound Waves ◽  
Linear Waves ◽  
Energy And Momentum ◽  
Linear Water Waves ◽  
Wave Momentum

For two-dimensional periodic water waves or sound waves, the kinetic energy per wavelength is ½mdc2, and the momentum per wavelength is ±mdc, where c is the wave velocity, and md is the drift mass per wavelength. These results also hold for three-dimensional periodic waves, for which the kinetic energy, momentum, and drift mass are all for one wave cell, the area of which is the product of the wavelengths in two perpendicular directions.The results obtained are rigorous, and not restricted to linear waves or even to nonlinear symmetric waves. For linear water waves, in particular, the kinetic energy can be shown to be equal to the sum of the potential energy and the surface energy (due to surface tension), so that the total energy E is twice the kinetic energy, andformula hereMcIntyre's (1981) contention that wave momentum is a myth is discussed at length for both water waves and sound waves.

Negative ions at an interface between liquid helium mixtures

2011 ◽  
Vol 37 (10) ◽  
pp. 803-805 ◽  
Author(s):  
A. M. Dyugaev ◽  
P. D. Grigoriev ◽  
E. V. Lebedeva
Keyword(s):  
Liquid Helium ◽  
Negative Ions ◽  
Helium Mixtures
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