大学物理 ›› 2021, Vol. 40 ›› Issue (01): 12-16.doi: 10.16854 /j.cnki.1000-0712.200049

• 教学讨论 • 上一篇    下一篇

再谈“流浪地球” ———让地球脱离太阳系最少需要做多大的功?

于凤军,田俊龙,汤振杰,鞠林   

  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:2020-02-23 修回日期:2020-04-24 出版日期:2021-01-07 发布日期:2021-01-07
  • 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) 资助; 河南省科技攻关项目( 172102210092) 资助

Talking about“wandering earth”again———How much work does it take to make the earth out of the solar system?

YU Feng-jun,TIAN Jun-long,TANG Zhen-jie,JU Lin   

  1. College of Physics and Electrical Engineering,Anyang Normal University,Anyang,Henan 455000,China
  • Received:2020-02-23 Revised:2020-04-24 Online:2021-01-07 Published:2021-01-07

摘要: 从一部国产科幻大片《流浪地球》的一项宏大计划出发,针对该计划第二步———让地球脱离太阳系,利用动量守恒定律、动能定理和逃逸速度、有效反冲喷射速度概念,计算了在地球质量能够满足生命存在的需要的条件下,让它脱离太阳系所需的最少做功为2.72×1032焦耳,并从能源角度讨论让地球脱离太阳系的可能性问题.

关键词: 流浪地球, 做功, 动量守恒, 动能定理, 逃逸速度, 有效反冲

Abstract: Starting from a grand plan of a domestic sci-fi blockbuster“The Wandering Earth”,the minimum mechanical work needed to take the earth out of the solar system is deduced and calculated by using the law of conservation of momentum,theorem of kinetic energy,and concept of escape velocity and effective recoil jet velocity. The result is 2.72×1032 J,and the possibility of separating the earth from the solar system is discussed from the perspective of energy.

Key words: wandering earth, doing work, law of conservation of momentum, theorem of kinetic energy, escape velocity, effect recoil