M Dash Foundation: C Cube Learning

Category: Teaching

  • The angular parameters of celestial mechanics !

    Define an Hour Circle. Its a bit tricky to define some astronomical parameters and not run into innocent looking misrepresentations of facts. One needs to cool his amber more times than there are parameters, then one gets a feel where and how to begin and give a good description. Hour Circle is a GREAT Circle,…

  • Star Motion, an interesting star concept.

    To budding astronomers. A difference between true velocity and proper velocity. Proper velocity (proper motion) is the motion of a star apparent to the center-of-mass of the solar system. That is, how fast any object (a star) is moving wrt the sun’s position. (in terms of its center-of-mass) So if a star is close to…

  • 3 myths of physics, especially in textbooks.

    2. Last year in a text book in Indian High School curriculum, I spotted and corrected with my students, the following: Myth; there are only 3 quarks that have been detected or FOUND/confirmed so far, in nature. Its based on a knowledge that was true more than 3 decades ago. All quarks, 6 of them,…

  • Why is the helicity for a mass-less particle Lorentz invariant?

    Result; now that photons are mass-less, their energy, momentum, speed, etc are no more variables, in the sense of arbitrariness. They are constants, taking only a few values, but constant in a given situation. But other particles have these properties; arbitrary. So electrons energy and momentum are not fixed, but arbitrary. But as long as…

  • A particle that defies classical mechanics !

    A photon has no mass but energy and it has speed and it has momentum although it does not have mass. Thats impossible in Classical Mechanics. Because Classical Mechanics associates with every mass; momentum and kinetic and potential energy. All those would be zero if mass were to be zero. Also the speed of the…