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Astronomy 1020-H Stellar Astronomy Spring_2014 Day-6

Astronomy 1020-H Stellar Astronomy Spring_2014 Day-6. Scientist Question. Einstein – 13 + 1/3 + 1/3 Galileo – 3 Sagan, da Vinci – 2 Hawking 1 + 1/3 Newton; de Grasse Tyson; Alan Turing; Oppenheimer; Lynn Margulus; Rosalind Franklin; Carl Jung; Euclid; Freud; Rachel Carson – 1

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Astronomy 1020-H Stellar Astronomy Spring_2014 Day-6

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  1. Astronomy 1020-H Stellar Astronomy Spring_2014 Day-6

  2. Scientist Question • Einstein – 13 + 1/3 + 1/3 • Galileo – 3 • Sagan, da Vinci – 2 • Hawking 1 + 1/3 • Newton; de Grasse Tyson; Alan Turing; Oppenheimer; Lynn Margulus; Rosalind Franklin; Carl Jung; Euclid; Freud; Rachel Carson – 1 • Michio Kaku – 1/3 + 1/3 • Telsa – 1/3

  3. Scientist Question – other class • Einstein – 3 • Copernicus – 2 • Newton; de Grasse Tyson; Oppenheimer; da Vinci; Darwin; Jane Goodall; Tesla; Hopper; None – 1 • George Washington Carver

  4. Course Announcements • Smartworks Chapter 2: Due Fri. 1/31 • SmartworksChapters 3, 4: Due Fri. 2/7 • Exam 1: Friday 2/7 – Chapters 1-4

  5. Celestial Sphere Rotation Celestial Sphere Rotation Star B Star B 2 2 Star A Star A 1 2 1 2 North Star Celestial Sphere 3 3 1 1 4 4 3 Horizon 3 Earth’s Equator 4 4 Celestial Sphere Rotation Celestial Sphere Rotation Figure 1 Figure 2 Rotation

  6. Tutorial: Motion – pg.3 • Work with a partner • Read the instructions and questions carefully • Talk to each other and discuss your answers with each another • Come to a consensus answer you both agree on • If you get stuck or are not sure of your answer ask another group • If you get really stuck or don’t understand what the Lecture Tutorial is asking as one of us for help

  7. Why does the sky change with your location? As you move away from the pole your horizon moves with you but the locations of the celestial poles and celestial equator remains the same

  8. Why does the sky change over the course of a year? As we orbit the sun the direction opposite the sun changes and we only see the stars when the sun is not up

  9. I Realize this is Like Trying to Drink from a Fire Hose

  10. Kepler’s First Law: The orbit of a planet about the Sun is an ellipse with the Sun at one focus.

  11. Kepler’s Second Law: A line joining a planet and the Sun sweeps out equal areas in equal intervals of time.

  12. According to Kepler’s second law, a planet with an orbit like Earth’s would: • move faster when further from the Sun. • move slower when closer to the Sun. • experience a dramatic change in orbital speed from month to month. • experience very little change in orbital speed over the course of the year. • none of the above.

  13. a3AU= P2years Kepler’s THIRD LAW • The size of the orbit determines the orbital period • planets that orbit near the Sun orbit with shorter periods than planets that are far from the Sun

  14. Kepler’s THIRD LAW • The size of the orbit determines the orbital period • planets that orbit near the Sun orbit with shorter periods than planets that are far from the Sun p = ~ 12 years p = 1 year

  15. Kepler’s THIRD LAW The size of the orbit determines the orbital period planets that orbit near the Sun orbit with shorter periods than planets that are far from the Sun MASS DOES NOT MATTER Both have p = 1 year

  16. Which of the following best describes what would happen to a planet’s orbital speed if it’s mass were doubled but it stayed at the same orbital distance? • A.It would orbit half as fast. • B. It would orbit less that half as fast. • C. It would orbit twice as fast. • D. It would orbit more than twice as fast. • E. It would orbit with the same speed.

  17. Newton’sFirstLaw of Motion A body remains at rest or moves in a straight line at a constant speed unless acted upon by an outside (net) force. A rockets will coast in space along a straight line at constant speed. A hockey puck glides across the ice at constant speed until it hits something

  18. Newton’sSecondLaw of Motion (net)Force = mass x acceleration or Fnet = m x a Acceleration is the rate of change in velocity – or how quickly your motion is changing. Three accelerators in your car!!

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