
List of articles
 Magnetic forces do no (net) work
 EMF in a solenoid
 A time line for VPython development
 Pseudowork and real work
 Feynman and transients
 A taste of geometric algebra
 What is Light? What are Radio Waves?
 Calculus and formal reasoning in intro physics
 Quantum entanglement
 The Feynman Lectures as textbook
 The Higgs boson and prediction in science
 Neutron decay
 Work and energy for an accelerating car
 GlowScript: 3D animations in a browser
 The speed of light in a material
 Good popular physics books
 History of Matter & Interactions
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Magnetic forces do no (net) work
Because the magnetic force on a moving charge is perpendicular to the velocity, the work done by a magnetic force is zero. However, in a multiparticle system it can happen that magnetic forces can rearrange the energy within the system, … Continue reading
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EMF in a solenoid
A colleague identified a puzzle concerning Faraday’s law. A circular loop at the center of a long solenoid with timevarying magnetic field will run a current due to the emf, which is the path integral of the (curly) nonCoulomb electric … Continue reading
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A time line for VPython development
Here is a time line for the development of VPython, an extension to the Python programming language that makes it unusually easy to generate navigable realtime 3D animations (vpython.org). 1997: While at Carnegie Mellon, after writing a volume on introductory … Continue reading
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Pseudowork and real work
I have a story to tell about pseudowork, the integral of a force along the displacement of the center of mass, which is different from the true work done by a force on a system, which must be calculated as … Continue reading
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Feynman and transients
In 19661969 I was active in an experimental particle physics group at Caltech and taught intro physics using the Feynman Lectures on Physics as the textbook, which was a fantastic experience. I often saw Feynman at lunch in the Caltech … Continue reading
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A taste of geometric algebra
David Hestenes’ goal for geometric algebra is to subsume under one umbrella many different kinds of mathematics used by scientists and engineers (see the Hestenes web site, and especially his Oersted Medal Lecture). The key to this unification is to … Continue reading
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What is Light? What are Radio Waves?
A talk given at a Santa Fe Science Cafe, 2013 Jan. 16 Abstract of the talk Video of the talk Interview on KSFR radio (15 minutes; choose the 3rd audio option) The great discovery by Maxwell about 150 years ago … Continue reading
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