1. Exam #1: Tuesday, February 27 bring: pencil, calculator closed book and closed neighbor!

2. Weight versus Apparent Weight:

3. The Moon Doesn’t Fall to the Earth!!! Why Not?

4. If I could give the Moon a larger velocity, what would happen?

6. Escape velocity is speed to beat gravity Figure 2.9 11.2 km/s 25000 mph!!

7. What’s wrong with this…. “… the shuttle blasts off … Then comes the tremendous pressure of three G’s and the sudden release into weightlessness as the ship leaves the gravitational field behind…” - from The Arizona Republic

8. The Andromeda galaxy is speeding toward the Milky Way at 300 km/s. What is this speed in units of mi/hr?

9. London is at a latitude of 52º N and a longitude of 1º W. Which of the following diagrams is an accurate representation of the rising stars? 52º 38º 52º 1º1º A)B) C)D)

10. Using a sky chart estimate the proper orientation of Orion on January 10 at 3AM. A) C) B)

11. Vega is one of the stars in the summer triangle. At what time will Vega rise tonight? A) Slightly after midnight B) 9PM C) never

12. As you are sailing in the open ocean, you observe that Polaris appears closer to the horizon every night. In which direction are you traveling? A)North B)South C)Due East D)Due West.

13. What is retrograde motion? A)East to west motion of the Sun B)East to west motion of the Moon relative to the stars C)Occasional east to west motion of the planets relative to the stars D)Occasional west to east motion of the planets relative to the stars.

14. Ptolemy A. developed the theory of epicycles. B. discovered that planets move in ellipses, not circles. C. discovered the phases of Venus and Jupiter's Moons. D. in 1543 proposed the Earth and planets move around the Sun. E. developed mathematical laws of motion and the theory of gravity.

15. A critical test demonstrating that the Earth is a sphere is observing A. that there is a horizon. B. that the entire sky moves around us. C. the Earth's shadow when the Moon is in its waxing crescent phase. D. the Earth's shadow at all eclipses of the Moon. E. that all objects rise and set on a 24-hour timescale.

16. Suppose you were an alien living on the fictitious planet Pizzahut and you wanted to measure its size. You spend years finding a location where the Sun is directly overhead at noon. You then travel to a location exactly 3000 miles to the north. There, you find that the Sun is only 30 degrees above your horizon at noon. What is the circumference of Pizzahut? a.90,000 mi b.18,000 mi c.36,000 mi d.100 mi e.1,800 mi