Kepler's 3rd law for circular orbits; Building up the shell-force by integration; Spring gun.

开普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。

youdao

Kepler's 3rd law for circular orbits; Building up the shell-force by integration; Spring gun.

开普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。

youdao