摘要 : We demonstrate that suitable initial conditions exist for a particle motion along a curved path, like a circle, without any external forces acting on it. This we achieve by diverting from the popular practice of describing motions... 展开 We demonstrate that suitable initial conditions exist for a particle motion along a curved path, like a circle, without any external forces acting on it. This we achieve by diverting from the popular practice of describing motions of macroscopic bodies through Newtonian mechanics, and instead opt for quantum mechanics. This we do for the hydrogen atom. The validity of the idea is demonstrated by presenting a formula for G, the universal gravitational constant. 收起