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Last Chapter Exam Review - partial

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York University
Natural Science
NATS 1745
Robin Metcalfe

NATS1745 60 History of Astronomy Exam Review1According to Descartes what is in between the planets and what drives the planets motion Space is filled with an invisible fluid ether in which the planets are carried around the Sun by whirling vortices Thus empty space does not existthe extension in length breadth and depth which constitutes the space occupied by a body is exactly the same as that which constitutes the body2According to Hooke what causes the planets to move contrary to Descartes planetary motion is due to an invisible attractive force that acts across empty space gravitational attraction3What does it mean to say that gravity is universalGravitational attraction is universal its the cause of motion both on Earth and in space Eg Earths gravity not only holds Earth together and causes freefall but also hold the Moon in orbit4According 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 whyThe close it gets to the ground the more attracted it is to the ground Gravitational attraction increases with proximity to its source5What did Newton invent which made him particularly suited to describing the motions of the planetsCalculusthe math that describes how quantities change and the only way to precisely describe motion6What did Newton find when he passed sunlight through 2 prisms What did he conclude from thisndThe wst prism disperses sunlight into a rainbow and the 2 prism recombines the colours into the original white sunlight Sunlight is composed of the colours of the rainbow7What is dispersionThe splitting of light into its component colours when it passes through a medium due to the different refraction angles of each colour8What is chromatic aberration Why did Newton construct a telescope with mirrors instead of glass lenses The failure of a lens to focus all colours in a light ray at the same point1
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