• free fall help!

    Updated: 2009-10-20 03:00:04
    *1. The problem statement, all variables and given/known data* a robot probe drops a camara off the rim of a 239 m high cliff on mars, where the freefall acceleration is -3.7 m/s^2. a. fiind the...

  • right hand rule?

    Updated: 2009-10-20 02:48:09
    Assume that a uniform magnetic field is directed into this page. If an electron is released with an initial velocity directed from the left edge to the right edge of the page, which of the following...

  • Forces AND Friction AND Motion O MY!

    Updated: 2009-10-20 02:34:31
    *1. The problem statement, all variables and given/known data* A cart with a mass of 285 kg is pushed horizontally with a force of 1400 N. The acceleration of gravity is 9.8 m/s/s. The coefficient...

  • Need Help Understanding KE, PE and Mechanical Energy lost due to friction

    Updated: 2009-10-20 02:18:40
    *1. The problem statement, all variables and given/known data* A 70 kg base runner begins his slide into second base when he is moving at a speed of 4.0m/s. The coefficient of friction between his...

  • Transformers problem and output voltage

    Updated: 2009-10-20 02:15:58
    *1. The problem statement, all variables and given/known data* Power is generated at 24 kV at a generating plant located 124 km from a town that requires 40 MW of power at 12 kV. The voltage will...

  • Nuclear Energy

    Updated: 2009-10-20 02:07:48
    How does the nucleas of an atom get energy?

  • Critical & Strategic Metals: The Big Pow Wow in Washington D.C.

    Updated: 2009-10-19 23:18:24
    I’m currently in Washington D.C., ahead of a three-day meeting called “Managing Supply Chain Risks for Critical & Strategic Metals”.  This meeting, co-chaired by Jack Lifton of Jack Lifton, LLC, and Lisa Reisman of Aptium Global, will no doubt be an interesting mix of discussions and participants.  It looks to cover rare earth metals, minor metals, platinum [...]

  • Elusive 'Persistent Current' That Flows Forever

    Updated: 2009-10-19 01:48:59
    Physicists at Yale University have made the first definitive measurements of "persistent current," a small but perpetual electric current that flows naturally through tiny rings of metal wire even without an external power source. The team used nanoscale cantilevers, an entirely novel approach, to indirectly measure the current through changes in the magnetic force it produces as it flows through the ring. "They're essentially little floppy diving boards with the rings sitting on top," said team leader Jack Harris, associate professor of physics and applied physics at Yale. The findings are reported in the October 9 issue of Science........

  • One In The Eye For Magnet Therapy?

    Updated: 2009-10-17 17:06:22
    A study on the therapeutic effects of magnetic and copper bracelets was published late this summer in Complementary Therapies in Medicine, and the news of its findings has slowly but surely filtered its way into the mainstream media. Unfortunately for the myriad purveyors of magnetic bracelets, necklaces, rings, insoles and other magnet therapy-related paraphernalia, the [...]

  • EAMCET (Engineering) 2009 Questions on Photoelectric Effect

    Updated: 2009-10-17 07:25:00
    : physicsplus The Physics Site for Success Saturday , October 17, 2009 EAMCET Engineering 2009 Questions on Photoelectric Effect Questions on photoelectric effect are usually interesting . One or two questions in this section often find place in entrance examination question papers . I give below two questions on photoelectric effect which were included in the EAMCET Engineering 2009 question : paper 1 The work function of a certain metal is 3.31 10 19 J . Then the maximum kinetic energy of photo electrons emitted by incident photons of wave length 5000 Ǻ is given h 6.62 10 34 Js , c 3 10 8 ms 1 e 1.6 10 19 coulomb 1 2.48 eV 2 0.41 eV 3 2.07 eV 4 0.82 eV It will be useful as I have mentioned on earlier occasions to remember that a photon of wave length 1000 Ǻ has energy of 12.4 eV . In other words , the product of the wavelength in Angstrom Ǻ and the energy in electron volt eV of any photon is 12400 units . Therefore , the energy of 5000 Ǻ photon is 12400 5000 2.48 . eV You can calculate the energy E of the photon in joule using the equation , E hc λ and then convert it into electron volt by dividing it by 1.6 10 19 as 1 eV 1.6 10 19 joule . But you will have to spend too much of

  • LHC now cooled to superconducting temperatures

    Updated: 2009-10-16 16:29:22
    The Large Hadron Collider's have been cooled to their superconducting operating temperatures at 1.9 kelvin. The online charts of the temperatures show all eight sectors of the LHC cooled.

  • BLOG: US DoD to assess risks to its rare earth materials supply chain

    Updated: 2009-10-13 13:12:37
    : : RareMetalBlog : EDITORS Stew Cowans Ian London , P . Eng Tracy Weslosky Fred Cowans Virginia Morgan Gareth Hatch , Ph.D Jack Lifton Enter your email : address Delivered by FeedBurner Categories Arafura Resources Limited Avalon Rare Metals . Inc Great Western Minerals Group . Ltd Lynas Corporation . Ltd Molycorp Minerals , LLC Neo Materials Technology . Inc Quest Uranium Corporation Rare Element Resources . Ltd RareMetalBlog RareMetalMedia RareMetalNews RareMetalStock Recent Comments Gareth Hatch on There Really is a Periodic Table Advantage LED Signs on BLOG : Mitsubishi installs world’s largest high-definition LED display Gareth Hatch on Ask the RareMetalTeam : Here Goerge(Penny Stock Investor on NEWS : Great Western Minerals Group Announces 10 Million Special Warrant Financing Tim on NEWS : Great Western Minerals Group Announces 10 Million Special Warrant Financing Gary Imburg on MEDIA The Rare Earth Metal's Shortage James on Ask the RareMetalTeam : Here fran on BLOG : US Geological Survey finds global rare earth metals reserves currently sufficient to meet needs ablazev on Thin Film Photovoltaics is growing , but will it win out Bill on MEDIA The Rare Earth Metal's Shortage

  • Wind Turbines – Up Close And Personal

    Updated: 2009-10-12 16:56:17
    Last week I was in Denmark, and while there I had an opportunity to pay a visit to some wind turbines operated by Aalborg University in Northern Denmark.  Getting to finally see and hear a fully functional 2.3 MW wind turbine “in the flesh” was pretty cool, I have to say. There was a reasonable wind [...]

  • Correlated Magnetics Research Launches “Programmable” Permanent Magnet Materials

    Updated: 2009-10-04 08:53:22
    I saw an intriguing news item over at the Magnetism & Electromagnetics Interest Group yesterday, and I see that it’s starting to make its way into the press.  The Huntsville Times is reporting that “Larry Fullerton, formerly of Time Domain, has developed a process to ‘program’ magnetic and electromagnetic materials so they will only attract [...]

  • Permanent Magnet Topics At SMMA Fall Technical Meeting

    Updated: 2009-10-03 17:36:04
    The SMMA (Motor and Motion Association) Fall Technical Conference takes place Nov 3-5, 2009 in Arlington Heights, Illinois this year.  Dr. Stan Trout of Spontaneous Materials will be giving a half-day pre-conference seminar titled “Permanent Magnets Fundamentals“ in the afternoon of Nov 3.  As I’ve said before, Stan is one of the best instructors I know [...]

  • Reminder: China Magnetics 2009 Is Around The Corner

    Updated: 2009-10-03 17:13:11
    Just a reminder folks, that the China Magnetics 2009 conference, organized by IntertechPira and the 8th in the series, takes place October 27-28, 2009 in Shanghai, China. This event brings the permanent magnets supply chain to Shanghai for “an in-depth discussion of recent trends and developments within China’s magnet and magnetic materials industry”. With the media frenzy [...]

  • The Beginning Of The End For Rare Earth Permanent Magnet Motors?

    Updated: 2009-10-02 06:22:09
    Okay, okay, so maybe I’m exaggerating just a little… but if the news from Japan today is anything to go by, perhaps we’re not far off. According to a report at TradingMarket.com, Japan’s Daikin Industries has teamed up with Professor Shigeo Morimoto from Osaka Prefecture University, to create an electric motor that produced high torque from [...]

  • Thorium Energy Joins United States Magnet Materials Association

    Updated: 2009-09-30 05:01:37
    Earlier today, the United States Magnet Materials Association [USMMA] announced that Thorium Energy, Inc. has joined its ranks.  Thorium Energy owns rare earth resources in Lemhi Pass, located in Idaho and Montana. According to the USMMA, this move “expands the coalition’s focus on rare earth materials and the rare earth magnet supply chain”. The USMMA was [...]

  • Running the Gauntlet: Rare Earths, Specialty Metals and Turf Wars Inside the Beltway – Part 4

    Updated: 2009-09-27 07:49:05
    This is the last in a four-part series of articles on the current scrutiny being given to rare earths by the US Congress and US Department of Defense, in the context of national security considerations.  The third part can be accessed here. The full white paper can be downloaded as a PDF file from here. Strategic [...]

  • Running the Gauntlet: Rare Earths, Specialty Metals and Turf Wars Inside the Beltway – Part 3

    Updated: 2009-09-27 07:36:11
    This is the third in a four-part series of articles on the current scrutiny being given to rare earths by the US Congress and US Department of Defense, in the context of national security considerations.  The second part can be accessed here. The full white paper can be downloaded as a PDF file from here. Strategic [...]

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