ASTR 4 Chapter Notes - Chapter 17-24: Supernova Remnant, Roman Numerals, Spectroscopy
Document Summary
Seasons = tilt of earth"s axis toward sun. Precession: gradual wobble that alters orientation of earth"s axis. Copernicus calculated planets" orbital period around sun (perfect circles: geometric layout of solar system. Tycho: observed nova = new star (supernova explosion of star) Orbit of each planet is an ellipse w/sun at one focus. Slowest: aphelion (furthest from sun: 2. Equal areas, equal time (total angular momentum constant: 3. p2 = a3. The farther a planet is from sun, the slower its average speed (by square root of ave. distance from sun) Acceleration of gravity (g): acceleration of a falling object (9. 8 m/s/s) Momentum = mass x velocity: change momentum by applying net force. Wednesday, september 30, 2015: torque: force that can change angular momentum. Astronauts in constant state of free fall in space = weightless. Conservation of angular momentum: can only change by transferring angular momentum to another object.
