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# Search results

30 records were found.

## Spherical volume averages of static electric and magnetic fields using Coulomb and Biot-Savart laws

Comment: 9 pages, 3 figures

## Rolling of asymmetric disks on an inclined plane

In a recent papers, Turner and Turner (2010 {\em Am. J. Phys.} {\bf 78} 905-7) and Jensen (2011 {\em Eur. J. Phys.} {\bf 32} 389-397) analysed the motion of asymmetric rolling rigid bodies on a horizontal plane. These papers addressed the common misconception that the instantaneous point of contact of the rolling body with the plane can be used to evaluate the angular momentum $\mathbf L$ and the torque $\boldsymbol\tau$ in the equation of motion $d\mathbf L/dt = \boldsymbol\tau$. To obtain the correct equation of motion, the "phantom torque" or various rules that depend on the motion of the point about which $\mathbf L$ and $\boldsymbol\tau$ are evaluated were discussed. In this paper, I consider asymmetric disks rolling down an inclined plane and describe the most basic way of obtaining the correct equation of motion; that is, to c...

## Can Hall drag be observed in Coulomb coupled quantum wells in a magnetic field?

Comment: LaTeX, 13 pages, 2 figures (to be published in Physica Scripta, Proc. of the 17th Nordic Semiconductor Conference)

## Optical phonon induced frictional drag in coupled two-dimensional electron gases

Comment: Revtex, 14 pages, 2 postscript figures

## Prospecting for the superfluid transition in electron-hole coupled quantum wells using Coulomb drag

Comment: 14 pages, 1 figure

Comment: 4 pages

## Relativistic addition of perpendicular velocity components from the constancy of the speed of light

Mermin [Am. J. Phys. {\bf 51}, 1130--1131 (1983)] derived the relativistic addition of the parallel components of velocity using the constancy of the speed of light. In this note, the derivation is extended to the perpendicular components of velocity.

## Relativistic momentum and kinetic energy, and $E=mc^2$

Comment: 9 pages, 2 Figures, submitted to American Journal of Physics

## Many-body exchange-correlation effects in the lowest subband of semiconductor quantum wires

Comment: 93 pages, REVTEX (LaTex) version 2, 16 Figures (not included, available upon request), UM-CM#0813

## Self-consistent calculation of ionized impurity scattering in semiconductor quantum wires

Comment: 11 pages, 4 Postscript files (appended), Revtex Version 3.0, UMCP-CMT-Hu-9301