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Chapter 7 - Exam Review Questions.docx

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Natural Science
NATS 1745
Robin Metcalfe

NATS1745 60 History of Astronomy 201112Chapter 7 Exam Review1According to Descartes what is in between the planets and what drives the planets motionDescartes thought there was invisible fluid ether in between the planets Each celestial body causes whirlpools The sun being the largest celestial body causes the largest whirlpool and the planets are carried around the sun by whirling vortices2According to Hooke what causes the planets to moveAccording to Hooke invisible gravitational attraction causes planetary motion3What does it mean to say that gravity is universalTo say that gravity is universal it means that it gravity causes motion on earth and in space For example it holds earth together causes freefall hold the moon in orbits4According to Hooke why does a freefalling object increase in speed as it falls toward the Earth What would happen to the Moons orbital speed if the Moon moved closer to the Earth and whyGravitational attraction increases with proximity to its source Example the closer a body is to Earth the stronger Earths pull on it Earths gravity holds it together and also keeps the Moon in orbitgravity increases as you get closer to the source So if the Moon were to be moved closer to the Earth it would orbit us faster5What did Newton invent which made him particularly suited to describing the motions of the planetsNewton invented calculus which can explain how a planet moves at any given time This made him suitable in describing the motion of the planets6What did Newton find when he passed sunlight through 2 prisms What did he conclude from thisstNewton found that the 1 prism turned sunlight into a rainbow and the 2 prism recombines the colors back to the original white sunlight He concluded that white light is composed of all the colors of the rainbow7What is dispersionDispersion is the splitting of light into its component colors when it passes through a medium due to the different refraction angles of each color8What is chromatic aberrationChromatic Aberration is the failure of lens to focus all the colors in a light rays at the same pointWhy did Newton construct a telescope with mirrors instead of glass lensesNewton constructed a telescope with mirror because it avoids chromatic aberration since it is not passing through any medium9Why are all large modern telescopes reflectors rather than refractorsAll modern telescopes are reflectors mirrors rather than refractors lens because of the difficulties in making large glass lens
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