由于向心力的作用，行星不能离开轨道飞入太空。
Centripetal force keeps the planets from flying off into space.
前提要求就是，具有向心加速度，朝这个方向，向心力的作用。
There is a requirement that there is a centripetal acceleration, which is in this direction, a centripetal.
发现带电粒子以电荷群的作用力为向心力做圆周运动时，有一常数乘以频率等于带电粒子的动能。
It finds that there is a constant multiplied by frequency which is equal to the kinetic energy, when a charged particle does circular motion for the centripetal force product by the charge group.
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