# Re: Possibly "silly" questions

From: Thomas A. Troszak (tom@tomtroszak.com)
Date: Fri Jun 15 2001 - 08:58:02 PDT

• Next message: Denis V. Denissenko: "Observation Jun 15"

```Steve Adams wrote:
> Another interest is that, at the distance above the equator they are, they
> must be travelling at phenomenal speeds to achieve geostationary and even
> greater for geosynchronous orbits, (when compared to surface and air travel
> speed records).

Actually, an object in orbit at approx 22,000 mile radius is traveling
44,000 (dia) x 3.14  = 138,160 miles per day / 24 hours = 5757 miles per
hour (approx)

Rather leisurely compared to a LEO object that travels approx 18,000
miles per hour.

Leo object at 9000 mile dia orbit  every 1.5 hours
9000 x 3.14 = 28260 miles per orbit
24 hours / 1.5 hours per orbit = 16 orbits per day or
28260 x 16 = 452160 miles per day  / 24 hour = 18840 miles per hour

Purists please note that I am aware that these figures are approximate,
I am trying to make the point simply.

> Am I also right in thinking that an object in space that is accelerating
> following a thrust but without further thrusts, will continue to increase
> it's speed, (indefinitely), until controlled by reverse thrusts, hitting
> another object or encountering a strong gravitational field?

An object that is accelerated into space by a thrust force will stop
accelerating as soon as the thrust stops and will continue traveling in
a straight line at a constant speed if no other forces are applied.
However, in our neck of the galaxy, an object traveling through space is
under constantly varying forces from the Sun, the planets, the solar
wind, and a multitude of other factors so a straight line is not likely
for long.

--
Tom Troszak,
Asheville, NC, USA
35.601 N, -82.554 W
mailto:tom@tomtroszak.com

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