• Starting torque required in a transmission system

    Updated: 2011-08-31 21:26:57
    I have a driver wheel at 6 meters diameter, expected Rpm=4, Torque=?, using two angle drives, 40:1 and 10:1 inline (in4rpm x 40=160rpmout) & (in160rpm x 10=1600rpm @3,300nm) driven side, can...

  • kinematics problem help

    Updated: 2011-08-31 21:19:13
    *1. The problem statement, all variables and given/known data* A ball is thrown vertically upward from the ground with an initial velocity of 30 m/s. Assume the acceleration due to gravity is g =...

  • Typo in FAQ article about cardinality

    Updated: 2011-08-31 21:14:08
    The FAQ article How does cardinality work? (http://www.physicsforums.com/showthread.php?t=508840) contains a typo. The last sentence of the section titled *The rational numbers are countable* states...

  • Newton's 3rd Law

    Updated: 2011-08-31 20:32:38
    Does anybody know of claims that there is a way to get around Newton's 3rd Law and Conservation of Momentum and have a link to where I might find that write up?

  • Related Rates problem.

    Updated: 2011-08-31 20:23:47
    Could someone verify my answer for this question? 13m ladder is leaning against a wall. If the top of the ladder slips down the wall at a rate of 2m/s. How fast will the foot be moving away from...

  • Homemorphism between the set of circles with rational points and rectangles

    Updated: 2011-08-31 20:16:57
    I am trying to solve a problem in which we need to prove that the set of all circles with rational points and radii is homemorphic to the set of all rectangles with vertices at rational points with...

  • Any OpenFOAM Users Here?

    Updated: 2011-08-31 19:45:58
    Hi all, I recently got OpenFOAM up and running on my Ubuntu OS. I really like this program. Are you a user and if so what do you think of the program? Thanks Matt

  • Living Reviews in Relativity: “Coalescence of Black Hole-Neutron Star Binaries”

    Updated: 2011-08-30 01:43:27
    Living Reviews in Relativity has published a new review article on “Coalescence of Black Hole-Neutron Star Binaries” by Masaru Shibata and Keisuke Taniguchi on August 29, 2011. Please find the abstract and further details below. —————— PUB.NO. lrr-2011-6 Shibata, Masaru and Taniguchi, Keisuke “Coalescence of Black Hole-Neutron Star Binaries” (incl. 30 figures and 232 references) ACCEPTED: 2011-07-07 PUBLISHED: 2011-08-29 FULL ARTICLE AT: http://www.livingreviews.org/lrr-2011-6 ABSTRACT: We review the [...]

  • LHCb experiment sees Standard Model physics

    Updated: 2011-08-29 17:47:07
    Over the weekend, the LHCb experiment at the Large Hadron Collider released new results bolstering the Standard Model of particle physics.

  • LHC results put supersymmetry theory ‘on the spot’

    Updated: 2011-08-28 18:43:16
    The HEP theory community is atwitter over a BBC News story LHC results put supersymmetry theory ‘on the spot’ that reports from the Lepton-Photon 2011 conference in Mumbai, where more null results relevant to supersymmetry were reported. According to the … Continue reading →

  • Essential Cosmology for the Next Generation 2012

    Updated: 2011-08-25 22:26:41
    This is the 4th annual “Cosmology on the Beach” meeting, combining a winter school with the latest research results. Course lectures blend with recent research advances in plenary talks, and student/postdoc participation. We encourage a diverse group of advanced graduate students and postdocs interested in attending to apply; established researchers enthusiastic about interacting are also [...]

  • LHC experiments eliminate more Higgs hiding spots

    Updated: 2011-08-22 15:06:09
    BATAVIA, IL and UPTON, NY - Two experimental collaborations at the Large Hadron Collider, located at CERN laboratory near Geneva, Switzerland, announced today that they have significantly narrowed the mass region in which the Higgs boson could be hiding.

  • This Week’s Hype, Part II

    Updated: 2011-08-21 19:39:18
    String theory hype is still coming fast and furious, so much so that the latest edition of This Week’s Hype needs to be a double issue. Today we learn that Black holes and pulsars could reveal extra dimensions, solving that … Continue reading →

  • New Fermilab experiment to take muons out for a spin

    Updated: 2011-08-19 15:37:32
    A new experiment planned at Fermilab will allow researchers to peer into the sub-atomic world of virtual particles and resolve a decade old mystery. The Fermilab muon g-2 experiment will use an intense beam of muons, short-lived particles that are similar to electrons but 200 times heavier.

  • String Theorists Suggest Space Wormholes Possible

    Updated: 2011-08-18 21:56:24
    I was just out for a bike ride, during which an idle thought came to me about a rule of thumb that might deserve publicity. This rule of thumb is that the mention of wormholes in a popular science book, … Continue reading →

  • Does String Theory Predict Low Energy Supersymmetry?

    Updated: 2011-08-16 23:21:57
    It used to be that string theorists would respond to arguments that string theory predicted nothing with the claim that it predicted supersymmetry. For example, in an interview with Witten done for the PBS Elegant Universe series, one sees: NOVA: … Continue reading →

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