The connection between the local and global conservation laws is provided by a theorem called Gauss’s theorem. In your course on electromagnetism, you learned Gauss’s law, which relates the electric f...The connection between the local and global conservation laws is provided by a theorem called Gauss’s theorem. In your course on electromagnetism, you learned Gauss’s law, which relates the electric flux through a closed surface to the charge contained inside the surface. In the case where no charges are present, it says that the flux through such a surface cancels out.
Since mass and energy are equivalent, we must stop talking about a material object’s kinetic energy and consider instead its total energy E, which includes a contribution from its mass. Massless parti...Since mass and energy are equivalent, we must stop talking about a material object’s kinetic energy and consider instead its total energy E, which includes a contribution from its mass. Massless particles always move at v=c , while massive ones always move at v<c .
