• Determine if three vectors lies in the same plane. (Linear Algebra - Introduction)

    Updated: 2009-12-31 15:49:50
    *1. The problem statement, all variables and given/known data* The problem is to decide that the vector *v* = (2, -7, 1) lies in the same plane M as the vectors *u1* = (2, -1, 3) *and* *u2* = (1,...

  • magnetic field within "holey" wire

    Updated: 2009-12-31 14:52:57
    *1. The problem statement, all variables and given/known data* You have a wire running along the z axis with radius a, a hole is drilled in this wire, off-centre, but also in the z-direction. The...

  • Electronic configuration

    Updated: 2009-12-31 13:35:09
    here is my problem. Galium Nitride is an Ionic Compound. Work out the electron arrangement of the Nitrogen ion

  • Super cool atom thermometer

    Updated: 2009-12-30 14:12:07
    As physicists strive to cool atoms down to ever more frigid temperatures, they face the daunting task of developing new, reliable ways of measuring these extreme lows. Now a team of physicists has devised a thermometer that can potentially measure temperatures as low as tens of trillionths of a degree above absolute zero. Their experiment is published in the current issue of Physical Review Letters and highlighted with a Viewpoint in the December 7 issue of Physics (http://physics.aps.org.)........

  • Particle physics experiment construction a boon for Minnesota neighbors

    Updated: 2009-12-22 00:01:40
    This video first appeared in Fermilab Today November 6. In this video, residents of northern Minnesota and the construction workers building the NOvA neutrino detector facility discuss the benefits project construction has brought their communities. The facility will house a multi-ton particle detector that will investigate the role of subatomic particles called neutrinos in the origin of [...]

  • IIT-JEE 2009 Multiple Choice Question (Single Answer Type) on Elastic Collision

    Updated: 2009-12-15 15:08:00
    : physicsplus The Physics Site for Success In science one tries to tell people , in such a way as to be understood by everyone , something that no one ever knew before . But in poetry , it's the exact opposite . Paul A.M . Dirac Tuesday , December 15, 2009 IIT-JEE 2009 Multiple Choice Question Single Answer Type on Elastic Collision The following question which appeared in IIT-JEE 2009 question paper is based on the principle that in an elastic collision between two particles of the same mass the velocities get interchanged : nbsp Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit . Their tangential velocities are v and 2v respectively as shown in the figure . Between collisions , the particles move with constant speeds . After making how many elastic collisions , other than that at A , these two particles will again reach the point A a 4 b 3 c 2 d 1 Particle P 1 after traversing one third AB of the circular track in the anticlockwise direction , will collide with particle P 2 at position B . This collision occurs when the particle P 2 has traversed two thirds ACB of the circular path since the speed of P 2 is twice

  • Magnets, Algae and Biofuels

    Updated: 2009-12-13 18:00:32
    Siemens reported recently on an interesting use of magnets for the harvesting of fast-growing algae that will eventually be turned into biofuels. The use of algae as a potential source of fuels is nothing new within the world of renewable energy. As Siemens says: Algae are a valuable source of raw material. For millions of years throughout [...]

  • How do We Deal With The Pollution Associated With Chinese Rare Earth Production?

    Updated: 2009-12-06 01:14:00
    I’ve just finished writing up a new article over at Rare MetalBlog titled “Chinese Rare Earth Production: A Darker Shade of Green?“.  The article discusses a new Sunday Times report on the extensive pollution caused by the mining and production of rare earths in China, and the effects that they’re having on the local people. It [...]

  • New Downhole Permanent Magnet Generator Tool For Extreme Oil, Gas & Geothermal Drilling

    Updated: 2009-12-03 20:11:43
    Earlier today, my colleagues at Dexter Magnetic Technologies announced the launch of an innovative downhole generator tool, which we have developed for some pretty extreme drilling conditions. This new high pressure – high temperature (HPHT) tool could lead the way to drilling deeper and more productive oil, gas and geothermal wells in the world’s most demanding drilling environments. The tool was [...]

Last Months Items