ASTR 101 Study Guide - Final Guide: Iodine, Phototube, 2000X

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O(cid:271)je(cid:272)t (cid:373)o(cid:448)es (cid:862)(cid:271)allisti(cid:272)all(cid:455)(cid:863) if it (cid:373)o(cid:448)es o(cid:374)l(cid:455) u(cid:374)de(cid:396) i(cid:374)flue(cid:374)(cid:272)e of g(cid:396)a(cid:448)it(cid:455: no rockets, no air resistance or other force. Ballistic motion is created by setting something in motion quickly then eliminating driving force: e. g. a rocket launched moves ballistically when engine is of. Fear that nuclear weapons could coast ballistically after being launched with no way of diversion. Artificial satellites: used fo(cid:396) tele(cid:272)o(cid:373)(cid:373)u(cid:374)i(cid:272)atio(cid:374)s satellites, (cid:858)sp(cid:455)(cid:859) satellites, (cid:449)eathe(cid:396) satellites, (cid:396)esou(cid:396)(cid:272)e (cid:373)o(cid:374)ito(cid:396)i(cid:374)g satellites, astronomical satellites (like the hubble) Iss is a nearby artificial satellite travelling at 7 km/h (orbits 90mins: moon is high altitude satellite orbiting monthly. Satellites that orbit earth once every 24 hours: useful for telecommunications (broadcasting television signals) Ideally to escape the earth, rocket would fire fast and furiously so that excess mass (fuel and unwanted stages of rocket) is shed quickly in order to coast. We are limited as rapid acceleration can cause damage because of g-forces.

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