Literaturnachweis - Detailanzeige
Autor/in | Blanco, Philip |
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Titel | Slow Down or Speed Up? Lowering Periapsis versus Escaping from a Circular Orbit |
Quelle | In: Physics Teacher, 55 (2017) 1, S.38-40 (3 Seiten)Infoseite zur Zeitschrift
PDF als Volltext |
Sprache | englisch |
Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
ISSN | 0031-921X |
Schlagwörter | Physics; Science Instruction; Scientific Concepts; Satellites (Aerospace); Motion; Aviation Technology |
Abstract | Paul Hewitt's "Figuring Physics" in the Feb. 2016 issue asked whether it would take a larger velocity change to stop a satellite in a circular orbit or to cause it to escape. An extension of this problem asks: What "minimum" velocity change is required to crash a satellite into the planet, and how does that compare with the velocity change required for escape? The solution presented here, using conservation principles taught in a mechanics course, serves as an introduction to orbital maneuvers, and can be applied to questions regarding the removal of objects orbiting Earth, other planets, and the Sun. In this article I examine the possible effects of a single coplanar impulse on a satellite in a circular orbit around an isolated spherical planet of mass M. I treat these impulses as "instantaneous" (of duration much less than the orbital period), which is a good approximation for most spacecraft. (As Provided). |
Anmerkungen | American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail: pubs@aapt.org; Web site: http://scitation.aip.org/tpt |
Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
Update | 2020/1/01 |