# astronomy A planet was viewed from Earth for several hours. The diagrams below represent the appearance of the planet at four different times.

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1 1. A planet was viewed from Earth for several hours. The diagrams below represent the appearance of the planet at four different times. 5. If the distance between the Earth and the Sun were increased, which change would occur? The apparent diameter of the Sun would decrease. The amount of insolation received by the Earth would increase. The time for one Earth rotation (rotation period) would double. The time for one Earth revolution (orbital period) would decrease. The best inference that can be made based on the diagrams is that this planet is tilted on its axis revolving changing seasons rotating 2. Compared to Jupiter and Saturn, Venus and Mars have greater periods of revolution orbital velocities mean distances from the Sun equatorial diameters 6. In 1851, the French physicist Jean Foucault constructed a large pendulum that always changed its direction of swing at the same rate in a clockwise direction. According to Foucault, this change in direction of swing was caused by the Moon's rotation on its axis Moon's revolution around the Earth Earth's rotation on its axis Earth's revolution around the Sun 7. In the diagram below, the arrows represent the paths of moving fluids on the surface of the Earth. Base your answers to questions 3 and 4 on the diagram below. The diagram represents the orbital paths of the Earth and Venus. Which statement best explains why the fluid is deflected? The Earth is rotating on its axis. The axis of the Earth is tilted. The Earth is revolving around the Sun. The Earth is moving away from the Sun. 3. To an observer on the Earth, the planet Venus does not appear at one fixed position among the stars because Venus rotates on its axis revolves around the Sun shows an apparent motion around the Earth shows a complete cycle of phases 4. When measured from the Earth, the apparent diameter of Venus varies in a cyclic manner due to changes in the rotation of Venus altitude of Venus distance between the Earth and Venus gravitational attraction between the Earth and Venus 8. The Coriolis effect provides evidence that Earth rotates has seasons has a tilted axis revolves 9. The apparent rising and setting of the Sun as seen from the Earth are caused by the rotation of the Sun revolution of the Earth rotation of the Earth revolution of the Sun 10. What is the total number of degrees that the Earth rotates on its axis during a 12-hour period? 1º 180º 15º 360º 11. The radius of the Earth is approximately 637 km 63,700 km 6,370 km 637,000 km

2 12. Approximately how many degrees does the Earth rotate on its axis in 1 hour? 1º 24º 15º 360º 13. In the geocentric model (the Earth at the center of the universe), which motion would occur? The Earth would revolve around the Sun. The Earth would rotate on its axis. The Moon would revolve around the Sun. The Sun would revolve around the Earth. 17. Base your answer to the following question on your knowledge of Earth science, the Earth Science Reference Tables, and the diagram below which shows part of the orbital paths of some of the planets of the solar system. 14. Which planetary model allows a scientist to predict the exact positions of the planets in the night sky over many years? The planets' orbits are circles in a geocentric model. The planets' orbits are ellipses in a geocentric model. The planets' orbits are circles in a heliocentric model. The planets' orbits are ellipses in a heliocentric model. 15. Which diagram best represents the motions of celestial objects in a heliocentric model? Which of the planets shown requires the longest time for one revolution around the Sun? Mercury Earth Venus Mars 18. The diagram below shows a planet's orbit around the Sun. At which location is the planet's orbital velocity greatest? A C B D 16. What is the eccentricity of the ellipse shown below? 19. The elliptical shape of the Earth's orbit results in changes in the orbital velocity of the Earth tilting of the Earth's axis the oblate spheroid shape of the Earth the phases of the Moon 20. As the distance between the Earth and a satellite increases, the gravitational attraction between them will decrease remain the same increase Three planets known as gas giants because of their large size and low density are Venus, Neptune, and Jupiter Jupiter, Saturn, and Venus Jupiter, Saturn, and Uranus Venus, Uranus, and Jupiter

3 22. The diagram below shows the orbits of planets A and B in a star-planet system. 25. The diagram below represents the orbit of a spacecraft around the sun. The period of revolution for planet B is 40 days. The period of revolution for planet A most likely is less than 40 days 40 days greater than 40 days 23. The diagram below represents the Earth's orbital path around the Sun. The Earth takes the same amount of time to move from A to B as from C to D. The eccentricity of the spacecraft's orbit is more eccentric than Earth's orbit but less eccentric than Mars' orbit more eccentric than planets 300 million km from the sun but less than those 100 million km from the sun more eccentric than the orbit of any planet in the solar system less eccentric than planets with a density less than 5 gm/cm Which planet's day is longer than its year? Mercury Mars Venus Jupiter 27. Which planet's orbit is most nearly circular? Earth Neptune Venus Pluto 28. A belt of asteroids is located an average distance of 503 million kilometers from the Sun. Between which two planets is this belt located? Mars and Jupiter Jupiter and Saturn Mars and Earth Saturn and Uranus Which values are equal within the system? The shaded sections of the diagram are equal in area. The distance from the Sun to the Earth is the same at point A and at point D. The orbital velocity of the Earth at point A equals its orbital velocity at point C. The gravitational force between the Earth and the Sun at point B is the same as the gravitational force at point D. 24. Which planet has vast amounts of liquid water at its surface? Venus Jupiter Mars Earth 29. Which statement best describes galaxies? They are similar in size to the solar system. They contain only one star but hundreds of planets. They may contain a few hundred stars in a space slightly larger than the solar system. They may contain billions of stars in a space much larger than our solar system. 30. According to the big bang theory, the universe began as an explosion and is still expanding. This theory is supported by observations that the stellar spectra of distant galaxies show a concentration in the yellow portion of the spectrum concentration in the green portion of the spectrum shift toward the blue end of the spectrum shift toward the red end of the spectrum

4 31. Which graph best represents the relationship between the gravitational attraction of two objects and their distance from each other? 35. The symbols below represent the Milky Way galaxy, the solar system, the Sun, and the universe. Which arrangement of symbols is most accurate? 32. Based on the red-shift data on galaxies, most astronomers infer that the universe is currently expanding moving randomly contracting fixed and stationary 33. In which list are celestial features correctly shown in order of increasing size? galaxy solar system universe planet solar system galaxy planet universe planet solar system galaxy universe universe galaxy solar system planet 34. Most astronomers agree that at the present time universe is contracting expanding staying the same size expanding and contracting regularly 36. A light year is the distance traveled by light in one year the distance the Earth moves in one year the time it takes light to go once around the Earth's orbit the time it takes light to travel one year 37. The Doppler effect predicts that light from a source moving away from Earth will be shifted to shorter wavelengths. shifted to longer wavelengths. appear blue. appear red. 38. The explosion of a massive star near the end of its life is known as a nova supernova pulsar nebula 39. Compared to the sun, Polaris is hotter and less luminous cooler and more luminous the same temperature and larger hotter and larger 40. Which star is cooler and many times brighter than Earth s Sun? Barnard s Star Rigel Betelgeuse Sirius

5 41. The diagram below represents a standard dark-line spectrum for an element. 44. In the diagram below, the spectral lines of hydrogen gas from three galaxies, A, B, and C, are compared to the spectral lines of hydrogen gas observed in a laboratory. The spectral lines of this element are observed in light from a distant galaxy. Which diagram represents these spectral lines? What is the best inference that can be made concerning the movement of galaxies A, B, and C? Galaxy A is moving away from Earth, but galaxies B and C are moving toward Earth. Galaxy B is moving away from Earth, but galaxies A and C are moving toward Earth. Galaxies A, B, and C are all moving toward Earth. Galaxies A, B, and C are all moving away from Earth. 42. To an observer on a ship at sea, at which latitude does the North Star appear closest to the horizon? 5º N 50º N 20º N 85º N 43. The diagram below shows the angular altitude of Polaris above the horizon at a certain location. What is the latitude of the observer? 15º N 30º N 25º N 65º N

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