escape velocity, the velocity a body must be given in order to escape the gravitational hold of some other larger body, e.g., the earth, moon, or sun. A body given less than the escape velocity will fall back toward the surface of the larger body; a body given a velocity equal to or greater than the escape velocity will still be attracted by the larger body, but this force will not be sufficient to cause it to return. Escape velocity depends on the mass of the larger body and the distance of the smaller body from its center, being proportional to the square root of the ratio of these two quantities. The velocity of escape from the earth at its surface is about 7 mi (11.3 km) per sec, or 25,000 mi per hr; from the moon's surface it is 1.5 mi (2.4 km) per sec; and for a body at the earth's distance from the sun to escape from the sun's gravitation, the velocity must be 26 mi (41 km) per sec.

escape velocity

Speed sufficient for a body to escape from a gravitational centre of attraction without accelerating further. It decreases with altitude and equals the square root of 2 (about 1.414) times the speed needed to maintain a circular orbit at the same altitude. At the surface of Earth, disregarding atmospheric resistance, escape velocity is about 6.96 mi/second (11.2 km/second). Escape velocity from the surface of the Moon is about one-third of this.

Mentioned in	?		Encyclopedia browser	?		Full browser	?
No references found			Firsov, Anatolii Firsov, Anatolii Vasilevich Firsov, Ivan Firsov, Nikolai Firsov, Nikolai Nikolaevich first First Aid First All-Russian Congress of Soviets of Peasants Deputies First All-Russian Congress of Soviets of Workers and Soldiers Deputies First All-Union Congress of Shock Brigades first answer print first arrival First Baron Raglan First Baron Tedder first boot sequence first bottom first category first cause first class first class module first coat First Conference of the Military and Combat Organizations of the First Conference of the Russian Social Democratic Labor Party First Congress of Soviets of the Union of Soviet Socialist Republics First Congress of the Russian Social Democratic Labor Party First cosmic velocity first cost first countable topological space First Day of Summer first derivative first derived curve first detector First Earl Wavell First Empire first estimate-second estimate method First Families of Virginia first filial generation first fire first fire composition First Fit first fixings first floor First Foot Day first Fresnel zone First Fruits of the Alps Sunday first gallery first generation computer first generation language first gust first harmonic First Horse Cavalry Army			First Congregational Church of Los Angeles First Congregational Church of Milford First Congregational Church of Royal Oak First Congregational Church of Wilmette First Congregational Church of Woodstock First Congregational United Church of Christ First Congress of Soviets of the Union of Soviet Socialist Republics First Congress of the Russian Social Democratic Labor Party First Connecticut Life Insurance Company First Consolidated Bank Foundation, Inc. First Consulting Group First Consulting Group Inc. First Consulting Group Infrastructure Services First Consulting Group Vietnam First Consumers National Bank First contact First Contact Resolution first contest First Contingency Incremental Transfer Capability First Contingency Total Transfer Capability First Copy Output Time First Corinthians First Corinthians First Corporate Law Services First Correctional Medical Inc. First cosmic velocity first cost first costs First council of buddhism First Council of Constantinople First Council of Constantinople (Second Ecumenical Council) First Council of Ephesus First Council of Lyon First Council of Lyons First Council of Nicaea First Council of Nicæa First Council of Nicea First Council of the Lateran First Council of the Lateran First Council of the Vatican first countable topological space first coupon First Coupons first cousin first cousin first cousin First cousin once removed First cousin once removed First cousin once removed First cousin once-removed First cousin once-removed First cousin once-removed First cousin thrice removed First cousin thrice removed First cousin thrice removed First cousin, once removed

escape velocity (redirected from First cosmic velocity)

escape velocity

escape velocity
(redirected from First cosmic velocity)