2018年8月12日 星期日

gravity、 ‘centre of gravity’ 知多少


Gravity - Wikipedia

https://en.wikipedia.org/wiki/Gravity
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another. On Earth,gravity gives weight to physical ...



New findings give some weight to the idea that life was blasted here from another planet.


重力源附近扭曲的時空
1916年,阿爾伯特·愛因斯坦發表廣義相對論,用幾何語言描述的重力理論,它代表了現代物理學中重力理論研究的最高水平。廣義相對論將古典的牛頓萬有引力定律包含在狹義相對論的框架中。在廣義相對論中,重力被描述為時空的一種幾何屬性(曲率);而這種時空曲率與處於時空中的物質輻射能量-動量張量直接相聯繫,其聯繫方式即是愛因斯坦場方程式(一個二階非線性偏微分方程式組)。





“It is perfectly normal in countries that have a tradition of referendums – which we haven’t in the UK – to have confirmatory votes at the end to see whether people are happy with what the government has negotiated.”




THEGUARDIAN.COM

Vince Cable says ‘centre of gravity’ shifting to second Brexit vote






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