让地球停转最少需要做多大的功?——从《流浪地球》谈起

How much work does it take to stop the Earth rotating?——Talking about“wandering Earth”

从一部国产科幻大片《流浪地球》的一项宏大计划出发,针对该计划第一步——让地球停止转动,利用角动量守恒定律、动能定理和第一宇宙速度概念推导并计算出让地球停转所需的最少做功为4.1×1030焦耳,并从能源角度讨论让地球停转的可行性问题.

Starting from a grand plan of a domestic sci-fi blockbuster“The Wandering Earth”,the minimum mechanical work needed to stop the Earth rotating is deduced and calculated by using the law of conservation of momentum moment,the theorem of kinetic energy and the concept of the first cosmic velocity.The result is about 4.1×1030 J.The problem of feasibility of stopping the Earth rotating is discussed from the viewpoint of energy.