energy,the first cosmic velocity ,"/> 让地球停转最少需要做多大的功?——<span style="font-size:12px;">从《流浪地球》谈起</span>

大学物理 ›› 2020, Vol. 39 ›› Issue (04): 10-12.doi: 10.16854 / j.cnki.1000-0712.190191

• 教学讨论 • 上一篇    下一篇

让地球停转最少需要做多大的功?——从《流浪地球》谈起

于凤军,贾拴稳,田俊龙,汤振杰   

  1. 安阳师范学院物理与电气工程学院,河南安阳 455000
  • 收稿日期:2019-05-02 修回日期:2019-08-04 出版日期:2020-04-20 发布日期:2020-04-20
  • 作者简介:于凤军(1959—),男,河南安阳人,安阳师范学院物理与电气工程学院教授,主要从事理论物理、天体力学研究和教学工作.
  • 基金资助:
    国家自然科学基金(11961131010,11475004)资助项目

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

YU Feng-jun,JIA Shuan-wen,TIAN Jun-long,TANG Zhen-jie   

  1. College of Physics and Electrical Engineering,Anyang Normal University,Anyang,Henan 455000,China
  • Received:2019-05-02 Revised:2019-08-04 Online:2020-04-20 Published:2020-04-20

摘要:

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.

关键词: 流浪地球, 地球转动, 角动量守恒, 质点系动能定理, 第一宇宙速度

Abstract:

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.

Key words: the wandering Earth, earth rotating, law of conservation of momentum moment, energy')">theorem of kinetic energy, the first cosmic velocity