Re: escape velocity and altitude
- From: Paul Schlyter <pausch.NO@xxxxxxxxxxxx>
- Date: Sat, 16 Apr 2005 09:24:39 +0200
In article <cc5a3513.0503250146.39c15fe5@xxxxxxxxxxxxxxxxxx>,
gkishang@xxxxxxxxx says...
>For how many seconds does the escape velocity of 11 kilometers (7
>miles per second) has to be maintained in order to deploy a satellite
>at an altitude of say 100 kms and 300 kms and 600 kms.
>
>I just want to know that for how long does a rocket have to travel at
>the speed of escape velocity.
Such a rocket doesn't need to travel at escape velocity at all. Orbital
velocity is enough. And orbital velocity is 8 km/s at low orbital
altitudes, and at higher orbital altitudes the orbital velocity is
inversely proportional to the square root of the orbital distance from
the Earth's center.
Escape velocity is needed only if you want the rocket to completely
escape the gravity of the Earth, instead of having it orbit the Earth.
At any altitude, escape velocity is equal to (circular) orbital velocity
multiplied by the square root of two.
--
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at saaf dot se
WWW: http://stjarnhimlen.se/
http://home.tiscali.se/pausch/
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