单词	escape speed
释义	escape speed (escape velocity) For a celestial body, the minimum speed with which an object must be projected away from its surface so that the object does not return again because of gravity. The escape speed for the Earth is where R is the radius of the Earth, and is approximately 11.2 kilometres per second. Similarly, the escape speed associated with a spherical celestial body of mass M and radius R is where G is the gravitational constant.
随便看	typical sequence UFD UKMT ultrametric unary operation unbiased estimator unbounded unconditional statement uncountable undecidable underdetermined uniform uniform convergence uniform distribution uniform gravitational force uniformization theorem uniformly continuous uniform space unimodal unimodular union unique factorization domain unit unit unitary matrix

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