1. Astro 10 practice for exam 1

2. Example of a good answer to essay question

3. Example of a not-so-good answer to essay q:

4. Please do better than this:

5. 1. Phases of the moon 1 2 3 4 8d c b a 5 6 7 This is the view of the earth, moon and sun as viewed from above the earth’s north pole. At which position is the moon during Third Quarter? sun

6. 2. Phases of the Moon 1 2 3 4 8d c b a 5 6 7 This is the view of the earth, moon and sun as viewed from above the earth’s north pole. At which position is the moon when it appears like this?

7. 3. Phases of the moon At what time wil you see the moon when it is in this phase? 1.Just before sunrise 2.Just after sunset 3.Around midnight 4.This phase could be visible any time

8. 4. Seasons Yesterday was the ‘autumnal equinox.’ What is special about this day? 1.The amount of daylight hours equals the number of night time hours 2.The earth is furthest from the sun at this point 3.The number of daylight hours will begin to decrease, until the spring equinox 4.The Sun will rise more and more in the north in the coming months 5.More than one of the above is true

9. 5. Seasons Why does it get colder during December, January and February? 1.The earth is further from the sun than during the other months of the year 2.The earth’s spin axis is tilted so that the sunlight is unevenly distributed over the globe 3.There are fewer hours of daylight in the northern hemisphere during these months 4.1 and 3 are both correct 5.2 and 3 are both correct

10. 6. Galileo Which of the following is true of Galileo? 1.He discovered the laws of planetary motion 2.He discovered that Venus has craters 3.He discovered 4 moons orbiting Jupiter 4.He was able to measure the distances to nearby stars, showing that they are at great distances from earth 5.More than one of the above

11. 7. Kepler’s Laws Which of the following is one of Kepler’s laws of planetary motion? 1.The time it takes for a planet to orbit the Sun depends on the mass of the planet 2.The orbits of the planets are circular 3.Planets sweep out equal areas in equal times as they orbit the Sun 4.The time it takes for a planet to orbit the Sun depends on the mass of the Sun 5.All of the above are Kepler’s Laws.

12. 8. Newton’s Laws Which of the following is true according to Newton’s Laws of Motion? 1.Objects in motion will gradually slow down unless acted upon by a force 2.Objects going in a circular path at a constant speed must be experiencing a force 3.A book that is resting on a table is not subject to any forces at all. 4.If I push a very heavy cart across the room, I must have exerted a greater force on it, than it did on me. 5.More than one of the above is true 6.All of the above are true

13. 9. Telescopes & observing Stars appear to twinkle as their light passes through the atmosphere. “Twinkling” is called “atmospheric seeing” by astronomers. It happens because 1.Layers of the atmosphere are at different temperatures and densities, so the light bends as it passes through them 2.molecules in the atmosphere absorb certain wavelengths of light 3.The stars are fluctuating in size 4.1 and 2 are both correct 5.None of the above are correct

14. 10. Gravity Newton found that any two objects exert a gravitational force on one another, obeying this equation: The Moon is about 400,000 km away from Earth. If the distance were only 200,000 km, how would the gravitational force change? 1.It would not change at all 2.It would be half as much 3.It would be twice as much 4.It would be four times as much 5.It would be only 1/4 as much